'ps' command with 'thcount' option does not work in Red Hat Enterprise Linux 7

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux (RHEL) 7
  • procps-ng < 3.3.10-10.el7

Issue

  • In prior releases, the 'ps' command accepted either 'nlwp' or 'thcount' as output-column specifications with the '-o' flag. In RHEL7, 'thcount' no longer works. The man page, however, still says both forms are valid.
[root@rhel7 ~]#  ps -o pid,cmd,thcount
error: unknown user-defined format specifier "thcount"

Resolution

This issue is addressed in the following procps updates:

Root Cause

Addition of tgid option introduced a bug which caused thcount option failed to be recognized.

Diagnostic Steps

  • On RHEL 6.5:
[root@rhel6~]#  ps -o pid,cmd,thcount           <==========works fine 
   PID CMD                         THCNT
  6761 -bash                           1
  7334 ps -o pid,cmd,thcount           1
  • on RHEL 7 :
[root@rhel7 ~]#  ps -o pid,cmd,thcount
error: unknown user-defined format specifier "thcount"

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