Do some reading. The UNIX kernel is part of the OS/390 nucleus now, not an overlay. IBM didn't decide that OS/390 is UNIX on a whim; it is branded UNIX by the people who own the trademark. Each UNIX variant has a set of extensions unique to that vendor/hardware combination. OS/390's extensions are the operating system formerly known as MVS. When you telnet into the OS/390 system, your default directory may be either a dataset high-level qualifier or a pathname. The UNIX filesystems are contained in MVS PDSE-type datasets called HFS's. Over the last 3 years, as I supported UNIX System Services on OS/390, I read with interest on Monday mornings how my UNIX counterparts were called in the middle of the night to correct application errors which brought down the Sun systems (OS/390 separates applications from OS), or full filesystems brought the system to its knees, as my O/390 just added another extent and kept trucking. More moronic posts: Lotus Notes: I installed Lotus notes on OS/390. No sweat. UNIX applications don't port: See the MKS web site for a list of applications which port just fine. Or the IBM web site, for that matter. OS/390 doesn't have a password file: DUH!!! Think there may be a connection between this and why OS/390 has never been truly hacked? Web serving: Guess which platform/http server can service the most transaction requests over a sustained time period? Yup, I'm an OS/390 bigot. I'm not blind to the strengths of other platforms; it would just be nice for others to give the mainframe its due.
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Do some reading. The UNIX kernel is part of the OS/390 nucleus now, not an overlay. IBM didn't decide that OS/390 is UNIX on a whim; it is branded UNIX by the people who own the trademark. Each UNIX variant has a set of extensions unique to that vendor/hardware combination. OS/390's extensions are the operating system formerly known as MVS. When you telnet into the OS/390 system, your default directory may be either a dataset high-level qualifier or a pathname. The UNIX filesystems are contained in MVS PDSE-type datasets called HFS's. Over the last 3 years, as I supported UNIX System Services on OS/390, I read with interest on Monday mornings how my UNIX counterparts were called in the middle of the night to correct application errors which brought down the Sun systems (OS/390 separates applications from OS), or full filesystems brought the system to its knees, as my O/390 just added another extent and kept trucking. More moronic posts: Lotus Notes: I installed Lotus notes on OS/390. No sweat. UNIX applications don't port: See the MKS web site for a list of applications which port just fine. Or the IBM web site, for that matter. OS/390 doesn't have a password file: DUH!!! Think there may be a connection between this and why OS/390 has never been truly hacked? Web serving: Guess which platform/http server can service the most transaction requests over a sustained time period? Yup, I'm an OS/390 bigot. I'm not blind to the strengths of other platforms; it would just be nice for others to give the mainframe its due.