new -o option: only the oldest that matches

pgrep.1

@@ -7,13 +7,13 @@
 pgrep, pkill \- look up or signal processes based on name and other attributes
 
 .SH SYNOPSIS
-pgrep [\-flnvx] [\-d \fIdelimiter\fP] [\-P \fIppid\fP,...] [\-g \fIpgrp\fP,...]
+pgrep [\-flvx] [\-d \fIdelimiter\fP] [\-n|\-o] [\-P \fIppid\fP,...] [\-g \fIpgrp\fP,...]
 .br
 	[\-s \fIsid\fP,...] [\-u \fIeuid\fP,...] [\-U \fIuid\fP,...] [\-G \fIgid\fP,...]
 .br
 	[\-t \fIterm\fP,...] [\fIpattern\fP]
 
-pkill [\-\fIsignal\fP] [\-fnvx] [\-P \fIppid\fP,...] [\-g \fIpgrp\fP,...]
+pkill [\-\fIsignal\fP] [\-fvx] [\-n|\-o] [\-P \fIppid\fP,...] [\-g \fIpgrp\fP,...]
 .br
 	[\-s \fIsid\fP,...] [\-u \fIeuid\fP,...] [\-U \fIuid\fP,...] [\-G \fIgid\fP,...]
 .br
@@ -61,6 +61,10 @@ List the process name as well as the process ID. (\fBpgrep\fP only.)
 Select only the newest (most recently started) of the matching
 processes.
 .TP
+\-o
+Select only the oldest (least recently started) of the matching
+processes.
+.TP
 \-P \fIppid\fP,...
 Only match processes whose parent process ID is listed.
 .TP
@@ -137,8 +141,8 @@ The running \fBpgrep\fP or \fBpkill\fP process will never report
 itself as a match.
 
 .SH BUGS
-The options \-n and \-v can not be combined.  Let me know if you need
-to do this.
+The options \-n and \-o and \-v can not be combined.  Let me know if
+you need to do this.
 
 Defunct processes are reported.