docs: Update ps.1 to warn about command name length

Previous versions of ps used to only match on the first 15 characters
because that's what the kernel used to provide. Newer kernels have a
longer length for this field so procps has been updated to suit.

References:
 procps-ng/procps#101
 https://bugzilla.suse.com/show_bug.cgi?id=1099091

diff --git a/ps/ps.1 b/ps/ps.1
index 82f973b99b091c3c6c93ce19d45c5078b012d6a1..e651143e2135d5031b13fb7e4397294c8646cd70 100644 (file)
--- a/ps/ps.1
+++ b/ps/ps.1
@@ -4,7 +4,7 @@
 .\" Quick hack conversion by Albert Cahalan, 1998.
 .\" Licensed under version 2 of the Gnu General Public License.
 .\"
-.TH PS 1 "February, 2018" "procps-ng" "User Commands"
+.TH PS 1 2018-08-08 "procps-ng" "User Commands"
 .\"
 .\" To render this page:
 .\"    groff -t -b -man -X -P-resolution -P100 -Tps ps.1 &
@@ -240,6 +240,10 @@ Identical to \fB\-\-pid\ \fI123\fR.
 Select by command name.  This selects the processes whose executable name is
 given in
 .IR cmdlist .
+NOTE: The command name is not the same as the command line. Previous versions
+of procps and the kernel truncated this command name to 15 characters. This
+limitation is no longer present in both. If you depended on matching only
+15 characters, you may no longer get a match.
 .TP
 .BI \-G \ grplist
 Select by real group ID (RGID) or name.  This selects the processes whose