Sys V or BSD derivated UNIX Post: 302208612

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Operating Systems BSD Sys V or BSD derivated UNIX Post 302208612 by bakunin on Tuesday 24th of June 2008 11:16:37 AM

06-24-2008

Registered User

In theory this might work, but all "real existing" UNIXes are some sort of "best of both worlds" nowadays.

AIX (as well as HP-Ux and as far as i know SunOS) will understand both syntaxes, "ps -ef" as well as "ps caux".

the same goes (in AIX, other UNIX dialects i do not know in-depth) for the printing/queue management subsystem, which is different in SysV and BSD. In AIX both the SysV variant and the BSD variant are understood, because both command groups are only frontends to a AIX-native subsystem, which is different from both.

There are 100%-BSD implementations out there (netBSD and FreeBSD for instance), but i do not know of any pure SysV-implementation that is worth noticing. (SCO? Please, have mercy....). So probably the best real-world-approach is to look into the output of "uname" and decide based on a translation table. Still I'd think that this distinction is merely academic nowadays, for reasons given.

I hope this helps.

bakunin

bakunin

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systemd-sysv-generator

SYSTEMD-SYSV-GENERATOR(8)				      systemd-sysv-generator					 SYSTEMD-SYSV-GENERATOR(8)

NAME

       systemd-sysv-generator - Unit generator for SysV init scripts

SYNOPSIS

       /lib/systemd/system-generators/systemd-sysv-generator

DESCRIPTION

       systemd-sysv-generator is a generator that creates wrapper .service units for SysV init[1] scripts in /etc/init.d/* at boot and when
       configuration of the system manager is reloaded. This will allow systemd(1) to support them similarly to native units.

       LSB headers[2] in SysV init scripts are interpreted, and the ordering specified in the header is turned into dependencies between the
       generated unit and other units. The LSB facilities "$remote_fs", "$network", "$named", "$portmap", "$time" are supported and will be turned
       into dependencies on specific native systemd targets. See systemd.special(5) for more details.

       SysV runlevels have corresponding systemd targets (runlevelX.target). The wrapper unit that is generated will be wanted by those targets
       which correspond to runlevels for which the script is enabled.

       systemd does not support SysV scripts as part of early boot, so all wrapper units are ordered after basic.target.

       systemd-sysv-generator implements systemd.generator(7).

SEE ALSO

       systemd(1), systemd.service(5), systemd.target(5)

NOTES

	1. SysV init
	   https://savannah.nongnu.org/projects/sysvinit

	2. LSB headers
	   http://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html

systemd 237														 SYSTEMD-SYSV-GENERATOR(8)