x Lift the BSD-style "must have a tty" restriction, which is imposed upon the set of all
processes when some BSD-style (without "-") options are used or when the ps personality
setting is BSD-like. The set of processes selected in this manner is in addition to the
set of processes selected by other means. An alternate description is that this option
causes ps to list all processes owned by you (same EUID as ps), or to list all processes
when used together with the a option.
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o format Specify user-defined format. Identical to -o and --format.
-o format User-defined format.
format is a single argument in the form of a blank-separated or comma-separated list,
which offers a way to specify individual output columns. The recognized keywords are
described in the STANDARD FORMAT SPECIFIERS section below. Headers may be renamed
(ps -o pid,ruser=RealUser -o comm=Command) as desired. If all column headers are empty
(ps -o pid= -o comm=) then the header line will not be output. Column width will increase
as needed for wide headers; this may be used to widen up columns such as WCHAN
(ps -o pid,wchan=WIDE-WCHAN-COLUMN -o comm). Explicit width control
(ps opid,wchan:42,cmd) is offered too. The behavior of ps -o pid=X,comm=Y varies with
personality; output may be one column named "X,comm=Y" or two columns named "X" and "Y".
Use multiple -o options when in doubt. Use the PS_FORMAT environment variable to specify
a default as desired; DefSysV and DefBSD are macros that may be used to choose the
default UNIX or BSD columns.
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