And when you dig into the rabbit's hole of 2D:4D ratio studies it seems that testosterone exposure in the womb can be linked to numerous cognition and personality differences:
In a sample of 516 freshmen (304 women), we find an inverted U-shaped relationship between digit ratio and mathematics grades. Males and females show the same pattern. Participants with both high and low digit ratios earn lower grades in mathematics, while participants which have intermediate digit ratios achieve the highest grades in mathematics. We also find that there is no statistically significant relationship between the digit ratio and the average grades earned by students in other courses except mathematics taken in the first semester at the Faculty of Business and Economics.
A low digit ratio has been liked to:
Assertiveness in females[9]
Psychoticism in females[81]
Aggression in males[17][82][83][84][85]
aggression in girls[86]
hyperactivity and poor social cognitive function in girls[87]
Masculinized handwriting in females[88]
Perceived 'dominance' and masculinity of man's face[89][90]
In an orchestral context, rank and musical ability in males[91]
Right hand low digit ratio predicts academic performance[92]
Mathematical ability[93]
Decreased mathematical ability[94]
Decreased empathy in response to adult testosterone levels[67]
higher propensity to attack without being provoked[95]
increased risk-taking behavior in men[96]
preference for normative behavior[97]
mean 2D:4D ratio among artists is lower than among controls[98]
higher numeracy (compared to literacy) in children[99]
higher criminal offending rates after puberty[100][101]
attenuated socio-affective skills[102]
Where as a High digit ratio has been linked to:
Personality traits correlated with digit ratio, higher being more feminized[103][104][105]
greater Openness personality factor[106]
Paranormal and superstitious beliefs among men with a higher digit ratio[107]
Higher exam scores among male students[34][108]
Higher neuroticism in both sexes with higher right hand digit ratio[109] and on left hand in females[81]
Higher left hand digit ratio in response to high adult testosterone levels predicts musical orchestra rank in females.[110]
Higher verbal fluency in both sexes.[52]
Higher visual recall in females.[111]
Higher literacy (compared to numeracy) in children[99]
. You would not need the hub system, flights would be arranged based on need.
This would be an amazing improvement to air travel. Pick your dates, pick the airports you're willing to fly out of and let an algorithm determine where flights are needed and where they can serve the most people.
There are people that consistently fly the cheapest airlines, despite there being other options because they can't afford anything else. Flying for work was an eye opening experience into how the 'other half' lives.
Start up a pilotless airline that flies some core routes and consumers will beat a path to your door. And while you're at it hire some industrial engineers to improve loading and unloading times.
I can grease the skids for support issues, help out other folks, dig around for weaknesses, etc.
Helping out on tiny menial tasks / scripts seems to help your career more than actual big development (even if big development needs the most work). If I know a task will take under 2 hours I'll volunteer, which leads to a lot of happy co-workers.
I also spend a lot of that time learning new languages or how to do things. ("How to mysql in python", "How to read xml in Python", "How to automate python with Jenkins",...) Leaving my sprint to concentrate on implementation: Writing a custom mysqlxml writer for one of our internal apps and automating it .
Do rural poor whites count as a minority? Because you see the exact same issues you see with the black community. The reason you probably haven't seen it yet in the Chinese and Indian communities is that a majority of them 2nd or 3rd generation.
And while you talk about 'whites' as a monolithic group the descendants of Brits were saying the same thing about the Irish, Italians and Germans in the US when those demographics started to arrive here. They were pushed into their own communities (A college friend grew up deep in Chicago's polish neighborhoods) and then blamed issues on their ancestry.
You don't even need a paper map. You just need to have an idea of where you're going, an understanding of geography and have a slight sense of adventure.
I used to wander around the midwest, sans maps, visiting family the summer before I went to college. If you've hit an ocean you're too far east/west way or the other. Mexico too far south, Canada too far north. Signs on the road are informative enough to get you where you're going.
If you look at history it's not like Native American hunting trips were a 9-5. They went on irregular expeditions that lasted days to a week. They worked until the job was done. The same with persistence hunters that would follow an animal until it was exhausted.
And I do have a regular, consistent cycle. It's just not based on a 24 hour clock it's on a 4 week basis. Personally I'd rather 'sprint' for a week and take 3 weeks off than try and maintain a regular daily schedule. I also do that with other tasks like grocery shopping. We make a month plan, spend half a day shopping, put everything away and eat for a month+.
At the end of the month I find that I have more time because it's not being 'killed by a thousand cuts'. Just being able to shop at 9AM on a Monday saves a considerable amount of time over shopping when everyone else is.
Am I one of the few that prefers to work like I did in college? Coast along doing small boring tasks ("homework") for a week or two then 'cramming' during a development sprint?
I've worked remotely for 7 years and I can't stand a consistent schedule, especially now that I'm primarily a stay at home working parent. Some days it's 7-9 until the kid wakes up. Then 1-3 during nap. Then 10pm-1a. Or any random combination therein.
Then when it's development sprint time I work on site in an office. I'll work 8a-12a. Put on a pot of coffee and do it again the next day, sometimes pulling an all nighter if I'm in a development groove. I've found I can get a normal '9-5x5' worth of work done in a single day if I eliminate interrupting my train of thought and having a nice quiet office.
Your statement ignores the statistics of reality. My wife and I were raised in similar situations to you and now made it to the 1%, but we realize we are a statistical anomaly.
Your upper middle class family that has a kid caught with drugs or any of the other dozen stupid things kids do can afford a good lawyer and a clean record. They can afford the private tutor to make sure their kids gets extra special attention. They can afford foods that promote brain development, and compared to some people, food all together.
You, like my wife, probably had the Single Mother who actually cared. Some kids aren't as fortunate.
What about those poor chinese kids, or indian kids,
You mean the one in a million (almost literally) that have the opportunity to test well enough to go somewhere? How many 'average' Chinese and Indian kids will never travel to the US to get an advanced degree because they didn't place in the top 0.1%? The statistical likely hood of some average Joe from an upper middle class family landing in these positions is considerably higher than a random person near the poverty line of any background.
Isn't that kind of the point? You optimize once and you save more on the other end since each playback device isn't wasting battery and bandwidth playing the less efficient version.
After I'm done with most of my tools I'm told I have to 'hand it off to India' for continued development / support.
I keep telling my manager that I'd rather hire a dozen high school dropouts that have completed some coding bootcamp. I don't need a CS major. I don't need a Software Engineer. I need someone that has shown any aptitude for a given language and has has enough initiative to want to learn.
As long as I can talk to them in their first language and have the opportunity to fly out to show them what I need in person once a quarter the quality is going to be better.
So, those people who decided to live way the heck out in the middle of nowhere to get away from civilization need electricity? Why?
So, those people who decided to live way the heck out in the middle of nowhere to get away from civilization need telephones? Why?
while noticing that the countries they compare us to generally don't have a lot of wide open spaces to cover.
Then why not compare the other countries to sections of the US where the population distribution looks similar?
Overlay South Korea on any chunk of the US that has a similar population, why doesn't that area have the speeds SK does? If you toss Germany on top of the Midwest you have similar mix of rural and urban areas, why don't those areas have broadband options that Germany does?
Shouldn't unpaid internships in a field be an indication of the saturation of the job market in addition to job prospects after graduation? We have highschool dropouts making $20+/hr where I live and companies still have a shortage of good workers. You can make a very good living working in those fields.
Even if you just use it as a stepping stone to another career. These people made the personal decision to go into a field that was saturated with people wanting to be in it and unpaid internships are a very easy filter.
Hell if you can pass a drug test and show up on time you can make pretty good money driving trucks right now. I wouldn't bank on that long term but it should be more than enough money to save some, take night courses at a community college and leverage it into another career.
I annotated up adduser but I can't seem to find where that value is set. I even deleted the whole line from the config and it's still getting it set somewhere.
cb2d8d3 (Jörg Hoh 2007-06-27 21:12:38 +0000 84) # check user and group names also against this regular expression. b2b6460e (Jörg Hoh 2009-09-07 21:20:22 +0000 85) #NAME_REGEX="^[a-z][-a-z0-9_]*\$"
And appears to have been added as a thing of convenience, not a hard rule:
diff --git a/adduser.conf b/adduser.conf --- a/adduser.conf +++ b/adduser.conf @@ -84,2 +84,2 @@
# check user and group names also against this regular expression. -#NAME_REGEX="^[a-z][-a-z0-9]*\$" +#NAME_REGEX="^[a-z][-a-z0-9_]*\$"
Adjusted documentation to NAME_REGEX
* added default value to/etc/adduser.conf
* NAME_REGEX also applies to group names
diff --git a/adduser.conf b/adduser.conf --- a/adduser.conf +++ b/adduser.conf @@ -82,0 +84,2 @@ +# check user and group names also against this regular expression. +#NAME_REGEX="^[a-z][-a-z0-9]*\$"
It then allowed me to login with it. With zero problems.
It then allowed me to do this:
[root@centos ~]# cd [root@centos ~]# adduser 1day [root@centos ~]# adduser 2day [root@centos ~]# useradd 3day [root@centos ~]# useradd 4day [root@centos ~]# id 1day uid=1001(1day) gid=1001(1day) groups=1001(1day) [root@centos ~]# id 2day uid=1002(2day) gid=1002(2day) groups=1002(2day) [root@centos ~]# id 3day uid=1003(3day) gid=1003(3day) groups=1003(3day) [root@centos ~]# id 4day uid=1004(4day) gid=1004(4day) groups=1004(4day) [root@centos ~]# uname -a Linux centos 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux [root@centos ~]#
So now I know you're full of shit. Name one distribution that does that, let alone a 'most'. Fuck at this point take a screenshot of any OS throwing an error trying to add a 0day user. You piqued my interest enough to download OpenIndiana and see what Solaris thinks.
but if you read the bug you would already know that adduser and useradd disagree on the acceptability of said username
No, I read what Pottering said. But time and time and time again his actual knowledge of how things work is completely wrong (See the rm -rf/foo/.*).
Systemd is turning out to be the Theranos of Linux with Pottering at the helm sounding more and more like Elizabeth Holmes every day. It's like he makes it up as he goes.
I'm fine with MI's machines because you get a quick result but still have the actual vote to recount.
Personally the state should buy some ultra high speed machines from 2 separate vendors and do an 'official' count at the state level. And run them until the 2 machines from 2 vendors agree.
Fine any local level machine vendors based on how far they deviate from the state's official count. 1% off? Small fine. 10% off? Huge fine and get a new vendor.
And what's worse is Pottering's complete lack of UNIX awareness.
Yes, as you found out "0day" is not a valid username. I wonder which tool permitted you to create it in the first place. Note that not permitting numeric first characters is done on purpose: to avoid ambiguities between numeric UID and textual user names.
Somehow FreeBSD doesn't have an issue:
[root@freenas2 ~]# adduser Username: 0day Full name: 0 Day Uid (Leave empty for default): Login group [0day]: Login group is 0day. Invite 0day into other groups? []: Login class [default]: Shell (sh csh tcsh bash rbash git-shell netcli.sh ksh93 mksh zsh rzsh scponly nologin) [sh]: bash Home directory [/home/0day]: Home directory permissions (Leave empty for default): Use password-based authentication? [yes]: no Lock out the account after creation? [no]: no Username : 0day Password : Full Name : 0 Day Uid : 8001 Class : Groups : 0day Home :/home/0day Home Mode : Shell :/usr/local/bin/bash Locked : no OK? (yes/no): yes adduser: INFO: Successfully added (0day) to the user database. Add another user? (yes/no): no Goodbye! [root@freenas2 ~]# su - 0day [0day@freenas2 ~]$ id 0day uid=8001(0day) gid=8001(0day) groups=8001(0day)
Slashdot Mirror
And when you dig into the rabbit's hole of 2D:4D ratio studies it seems that testosterone exposure in the womb can be linked to numerous cognition and personality differences:
2D:4D values are associated with mathematics performance in business and economics students
In a sample of 516 freshmen (304 women), we find an inverted U-shaped relationship between digit ratio and mathematics grades. Males and females show the same pattern. Participants with both high and low digit ratios earn lower grades in mathematics, while participants which have intermediate digit ratios achieve the highest grades in mathematics. We also find that there is no statistically significant relationship between the digit ratio and the average grades earned by students in other courses except mathematics taken in the first semester at the Faculty of Business and Economics.
A low digit ratio has been liked to:
Where as a High digit ratio has been linked to:
Not if that decoder is in hardware.
You can play H.265 on machines with hardware decoding that are relatively 'slow'.
Here’s a quick rundown of well-known hardware that includes dedicated HEVC decoding blocks, which definitely support efficient HEVC playback:
. You would not need the hub system, flights would be arranged based on need.
This would be an amazing improvement to air travel. Pick your dates, pick the airports you're willing to fly out of and let an algorithm determine where flights are needed and where they can serve the most people.
There are people that consistently fly the cheapest airlines, despite there being other options because they can't afford anything else. Flying for work was an eye opening experience into how the 'other half' lives.
Start up a pilotless airline that flies some core routes and consumers will beat a path to your door. And while you're at it hire some industrial engineers to improve loading and unloading times.
I can grease the skids for support issues, help out other folks, dig around for weaknesses, etc.
Helping out on tiny menial tasks / scripts seems to help your career more than actual big development (even if big development needs the most work). If I know a task will take under 2 hours I'll volunteer, which leads to a lot of happy co-workers.
I also spend a lot of that time learning new languages or how to do things. ("How to mysql in python", "How to read xml in Python", "How to automate python with Jenkins", ...) Leaving my sprint to concentrate on implementation: Writing a custom mysqlxml writer for one of our internal apps and automating it .
Do rural poor whites count as a minority? Because you see the exact same issues you see with the black community. The reason you probably haven't seen it yet in the Chinese and Indian communities is that a majority of them 2nd or 3rd generation.
And while you talk about 'whites' as a monolithic group the descendants of Brits were saying the same thing about the Irish, Italians and Germans in the US when those demographics started to arrive here. They were pushed into their own communities (A college friend grew up deep in Chicago's polish neighborhoods) and then blamed issues on their ancestry.
You don't even need a paper map. You just need to have an idea of where you're going, an understanding of geography and have a slight sense of adventure.
I used to wander around the midwest, sans maps, visiting family the summer before I went to college. If you've hit an ocean you're too far east/west way or the other. Mexico too far south, Canada too far north. Signs on the road are informative enough to get you where you're going.
[Citation Needed]?
If you look at history it's not like Native American hunting trips were a 9-5. They went on irregular expeditions that lasted days to a week. They worked until the job was done. The same with persistence hunters that would follow an animal until it was exhausted.
And I do have a regular, consistent cycle. It's just not based on a 24 hour clock it's on a 4 week basis. Personally I'd rather 'sprint' for a week and take 3 weeks off than try and maintain a regular daily schedule. I also do that with other tasks like grocery shopping. We make a month plan, spend half a day shopping, put everything away and eat for a month+.
At the end of the month I find that I have more time because it's not being 'killed by a thousand cuts'. Just being able to shop at 9AM on a Monday saves a considerable amount of time over shopping when everyone else is.
Am I one of the few that prefers to work like I did in college? Coast along doing small boring tasks ("homework") for a week or two then 'cramming' during a development sprint?
I've worked remotely for 7 years and I can't stand a consistent schedule, especially now that I'm primarily a stay at home working parent. Some days it's 7-9 until the kid wakes up. Then 1-3 during nap. Then 10pm-1a. Or any random combination therein.
Then when it's development sprint time I work on site in an office. I'll work 8a-12a. Put on a pot of coffee and do it again the next day, sometimes pulling an all nighter if I'm in a development groove. I've found I can get a normal '9-5x5' worth of work done in a single day if I eliminate interrupting my train of thought and having a nice quiet office.
Your statement ignores the statistics of reality. My wife and I were raised in similar situations to you and now made it to the 1%, but we realize we are a statistical anomaly.
Your upper middle class family that has a kid caught with drugs or any of the other dozen stupid things kids do can afford a good lawyer and a clean record. They can afford the private tutor to make sure their kids gets extra special attention. They can afford foods that promote brain development, and compared to some people, food all together.
You, like my wife, probably had the Single Mother who actually cared. Some kids aren't as fortunate.
What about those poor chinese kids, or indian kids,
You mean the one in a million (almost literally) that have the opportunity to test well enough to go somewhere? How many 'average' Chinese and Indian kids will never travel to the US to get an advanced degree because they didn't place in the top 0.1%? The statistical likely hood of some average Joe from an upper middle class family landing in these positions is considerably higher than a random person near the poverty line of any background.
back up your thoughts with data.
Didn't we try that with systemd?
It would be trivial to add a continuous integration step to the PlayStore data.
Forget app size in MB, I want to know how long it takes to launch. How much RAM it uses after launch. How much RAM it uses after 1 hour open.
Isn't that kind of the point? You optimize once and you save more on the other end since each playback device isn't wasting battery and bandwidth playing the less efficient version.
Get gamed by the algorithm.
Good for them. Once they have enough knowledge they're too expensive for what I need.
No one stays an apprentice forever in plumbing, hvac or electrical either. But there's a ton of apprentice level work to be done.
After I'm done with most of my tools I'm told I have to 'hand it off to India' for continued development / support.
I keep telling my manager that I'd rather hire a dozen high school dropouts that have completed some coding bootcamp. I don't need a CS major. I don't need a Software Engineer. I need someone that has shown any aptitude for a given language and has has enough initiative to want to learn.
As long as I can talk to them in their first language and have the opportunity to fly out to show them what I need in person once a quarter the quality is going to be better.
So, those people who decided to live way the heck out in the middle of nowhere to get away from civilization need electricity? Why?
So, those people who decided to live way the heck out in the middle of nowhere to get away from civilization need telephones? Why?
while noticing that the countries they compare us to generally don't have a lot of wide open spaces to cover.
Then why not compare the other countries to sections of the US where the population distribution looks similar?
Overlay South Korea on any chunk of the US that has a similar population, why doesn't that area have the speeds SK does? If you toss Germany on top of the Midwest you have similar mix of rural and urban areas, why don't those areas have broadband options that Germany does?
Shouldn't unpaid internships in a field be an indication of the saturation of the job market in addition to job prospects after graduation? We have highschool dropouts making $20+/hr where I live and companies still have a shortage of good workers. You can make a very good living working in those fields.
Even if you just use it as a stepping stone to another career. These people made the personal decision to go into a field that was saturated with people wanting to be in it and unpaid internships are a very easy filter.
Hell if you can pass a drug test and show up on time you can make pretty good money driving trucks right now. I wouldn't bank on that long term but it should be more than enough money to save some, take night courses at a community college and leverage it into another career.
Where is it reading that default value from?
I annotated up adduser but I can't seem to find where that value is set. I even deleted the whole line from the config and it's still getting it set somewhere.
At this point I'm not unsure that Zero__Kelvin isn't Pottering's slashdot account.
I'll be damned. Is it commented out by default?
It looks like NAME_REGEX is an optional check and commented out by default on my 16.04 install. CentOS doesn't even have one installed.
I pulled it's from the source: https://alioth.debian.org/anon... and it's commented out.
cb2d8d3 (Jörg Hoh 2007-06-27 21:12:38 +0000 84) # check user and group names also against this regular expression.
b2b6460e (Jörg Hoh 2009-09-07 21:20:22 +0000 85) #NAME_REGEX="^[a-z][-a-z0-9_]*\$"
And appears to have been added as a thing of convenience, not a hard rule:
commit b2b6460eab2b2bc514ffe45f5b8abca32b47fafc
Author: Jörg Hoh
fix 520586: allow underscores again in usernames
diff --git a/adduser.conf b/adduser.conf
--- a/adduser.conf
+++ b/adduser.conf
@@ -84,2 +84,2 @@
# check user and group names also against this regular expression.
-#NAME_REGEX="^[a-z][-a-z0-9]*\$"
+#NAME_REGEX="^[a-z][-a-z0-9_]*\$"
commit ccb2d8d37f6a09e0958a0e8b5bc8bc36372078a4
Author: Jörg Hoh
Adjusted documentation to NAME_REGEX /etc/adduser.conf
* added default value to
* NAME_REGEX also applies to group names
diff --git a/adduser.conf b/adduser.conf
--- a/adduser.conf
+++ b/adduser.conf
@@ -82,0 +84,2 @@
+# check user and group names also against this regular expression.
+#NAME_REGEX="^[a-z][-a-z0-9]*\$"
I tried CentOS. I went to the source.
I downloaded the latest ISO they had. I did a fresh clean install.
It let me use 0day as the install user.
http://imgur.com/a/8PZcS
It then allowed me to login with it. With zero problems.
It then allowed me to do this:
[root@centos ~]# cd
[root@centos ~]# adduser 1day
[root@centos ~]# adduser 2day
[root@centos ~]# useradd 3day
[root@centos ~]# useradd 4day
[root@centos ~]# id 1day
uid=1001(1day) gid=1001(1day) groups=1001(1day)
[root@centos ~]# id 2day
uid=1002(2day) gid=1002(2day) groups=1002(2day)
[root@centos ~]# id 3day
uid=1003(3day) gid=1003(3day) groups=1003(3day)
[root@centos ~]# id 4day
uid=1004(4day) gid=1004(4day) groups=1004(4day)
[root@centos ~]# uname -a
Linux centos 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@centos ~]#
So now I know you're full of shit. Name one distribution that does that, let alone a 'most'. Fuck at this point take a screenshot of any OS throwing an error trying to add a 0day user. You piqued my interest enough to download OpenIndiana and see what Solaris thinks.
but if you read the bug you would already know that adduser and useradd disagree on the acceptability of said username
No, I read what Pottering said. But time and time and time again his actual knowledge of how things work is completely wrong (See the rm -rf /foo/.*).
Systemd is turning out to be the Theranos of Linux with Pottering at the helm sounding more and more like Elizabeth Holmes every day. It's like he makes it up as he goes.
The thing is you still have a real paper trail.
I'm fine with MI's machines because you get a quick result but still have the actual vote to recount.
Personally the state should buy some ultra high speed machines from 2 separate vendors and do an 'official' count at the state level. And run them until the 2 machines from 2 vendors agree.
Fine any local level machine vendors based on how far they deviate from the state's official count. 1% off? Small fine. 10% off? Huge fine and get a new vendor.
It is dangerous to allow them to start with digits as we have seen
Systemd aside is there any danger? Or is the danger in using usernames that start with a digit systemd?
Most distributions follow this safe rule.
Who is 'most'? On Ubuntu 16.04:
root@m6700:~# useradd 1day
root@m6700:~# id 1day
uid=1003(1day) gid=1003(1day) groups=1003(1day)
root@m6700:~# id 0day
uid=1002(0day) gid=1002(0day) groups=1002(0day)
root@m6700:~# useradd -u 2002 2001
That works just fine.
You have got to be fucking kidding me: systemd can't handle the process previlege that belongs to user name startswith number, such as 0day #6237
And what's worse is Pottering's complete lack of UNIX awareness.
Yes, as you found out "0day" is not a valid username. I wonder which tool permitted you to create it in the first place. Note that not permitting numeric first characters is done on purpose: to avoid ambiguities between numeric UID and textual user names.
Somehow FreeBSD doesn't have an issue:
[root@freenas2 ~]# adduser /home/0day /usr/local/bin/bash
Username: 0day
Full name: 0 Day
Uid (Leave empty for default):
Login group [0day]:
Login group is 0day. Invite 0day into other groups? []:
Login class [default]:
Shell (sh csh tcsh bash rbash git-shell netcli.sh ksh93 mksh zsh rzsh scponly nologin) [sh]: bash
Home directory [/home/0day]:
Home directory permissions (Leave empty for default):
Use password-based authentication? [yes]: no
Lock out the account after creation? [no]: no
Username : 0day
Password :
Full Name : 0 Day
Uid : 8001
Class :
Groups : 0day
Home :
Home Mode :
Shell :
Locked : no
OK? (yes/no): yes
adduser: INFO: Successfully added (0day) to the user database.
Add another user? (yes/no): no
Goodbye!
[root@freenas2 ~]# su - 0day
[0day@freenas2 ~]$ id 0day
uid=8001(0day) gid=8001(0day) groups=8001(0day)
His failure to understand POSIX has shown up in the past as well: tmpfiles: R! /dir/.* destroys root #5644 with Pottering's amazing comment of:
I am not sure I'd consider this much of a problem. Yeah, it's a UNIX pitfall, but "rm -rf /foo/.*" will work the exact same way, no?
It's not like you couldn't take 5 seconds to test that:
root@m6700:~# mkdir /foo /foo/.test /foo/.test2 /foo/ .. .test .test2 /foo/.* /foo/ ..
root@m6700:~# touch
root@m6700:~# mkdir
root@m6700:~# ls -lah
total 12K
drwxr-xr-x 3 root root 4.0K Jul 29 14:04 .
drwxr-xr-x 25 root root 4.0K Jul 29 14:04
-rw-r--r-- 1 root root 0 Jul 29 14:04
drwxr-xr-x 2 root root 4.0K Jul 29 14:04
root@m6700:~# rm -rf
rm: refusing to remove '.' or '..' directory: skipping '/foo/.'
rm: refusing to remove '.' or '..' directory: skipping '/foo/..'
root@m6700:~# ls -lah
total 8.0K
drwxr-xr-x 2 root root 4.0K Jul 29 14:04 .
drwxr-xr-x 25 root root 4.0K Jul 29 14:04