pidof: support for omitted %PPID and additional separators

This commit introduces support for special %PPID value that
can be passed to the -o option as a substitution for parent
PID. It also allows users to use two additional separators
for omitted PIDs - colon and semicolon.

1 files changed, 3 insertions, 1 deletions

diff --git a/pidof.1 b/pidof.1
index f2544c8..f49cd23 100644
--- a/pidof.1
+++ b/pidof.1
@@ -44,7 +44,9 @@ the current root directory of processes they do not own.
 Scripts too - this causes the program to also return process id's of
 shells running the named scripts.
 .IP "-o \fIomitpid\fP"
-Tells \fIpidof\fP to omit processes with that process id.
+Tells \fIpidof\fP to omit processes with that process id. The special
+pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
+program, in other words the calling shell or shell script.
 .SH "EXIT STATUS"
 .TP
 .B 0