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I actually thought ps was segfaulting, and it wasn't until I was in gdb
that I even noticed there was an error message at all, and even then I
had to read the source to work out what it was trying to tell me.
Before:
$ ps -o user,pid,ppid,vsize,rss,nice,wchan,addr,unknown,stat,cmd
ps: -o 'user,pid,ppid,vsize,rss,nice,wchan,addr,unknown,stat,cmd'@41
USER PID PPID VSZ RSS NI WCHAN ADDR$
After:
$ ps -o user,pid,ppid,vsize,rss,nice,wchan,addr,unknown,stat,cmd
ps: bad -o field 'user,pid,ppid,vsize,rss,nice,wchan,addr,unknown,stat,cmd'
^
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