Why does "ps -l" shows one number in column "PRI" but in same time "ps -o pri" shows another number?

Solution Verified - Updated -

Issue

  • Why does ps -l shows one number in column "PRI" but in same time ps -o pri shows another number? for instance:

    $ ps -elf | grep migration
F S UID      PID PPID  C PRI  NI ADDR SZ WCHAN  STIME TTY          TIME CMD
1 S root       3    2  0 -40   - -     0 migrat Mar28 ?        00:00:04 [migration/0]

$ ps -eo pid,ni,pri,comm | grep migration
PID NI PRI COMMAND
  3  - 139 migration/0

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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