UNIX-, BSD-, GNU-options in linux commands. Where are they from?
In manual for ps command on ubuntu there is text:
This version of ps accepts several kinds of options:
1 UNIX options, which may be grouped and must be preceded by a
dash.
2 BSD options, which may be grouped and must not be used with
a dash.
3 GNU long options, which are preceded by two dashes.
Why is it possible that command built in ubuntu uses options from different operating sysem? I know that source of LINUX, UNIX and BSD is the same but they are different branches.
In manual for ps command on ubuntu there is text:
This version of ps accepts several kinds of options:
1 UNIX options, which may be grouped and must be preceded by a
dash.
2 BSD options, which may be grouped and must not be used with
a dash.
3 GNU long options, which are preceded by two dashes.
Why is it possible that command built in ubuntu uses options from different operating sysem? I know that source of LINUX, UNIX and BSD is the same but they are different branches.
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