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I'm not sure if anyone actually uses these things, but if you selected test fields on the command line ps would crash. $ ps/pscommand -o _left Signal 11 (SEGV) caught by pscommand (3.3.11.877-0488). /home/csmall/Projects/procps/procps/ps/.libs/pscommand:ps/display.c:66: please report this bug Segmentation fault Anyway, it doesn't now: $ ps/pscommand -o pid,_left,_left2,_right,_unlimited 1 PID LLLLLLLL L2L2L2L2 RRRRRRRRRRR U 1 tty7 3270/tty4 59:59 [123456789-12345] <defunct>