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ulimit call lists invalid options

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  ulimit call lists invalid options L A Walsh <bash@tlinx.org> - 2019-07-29 19:57 -0700

#15273 — ulimit call lists invalid options

in bash 4.4.12,
giving an invalid option to ulimit gives a usage:
ulimit: usage: ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]
-SH are for Soft/Hard, so they don't count and -a is for all,
so skipping the first 4, the rest:
but the rest:

ops=$(ulimit -h |& perl -ne 'm{\[([^\]]++)\]} && print "$1\n"')
ops=${ops:4}
echo ops=$ops

for ((i=0; i<${#ops};++i));do
op=${ops:i:1}
out=$(echo "-$op: $(ulimit -$op 2>&1)")
((${#out}>30)) && echo "$out"
done
----
bcdefiklmnpqrstuvxPT
-b: -bash: ulimit: -b: invalid option
ulimit: usage: ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]
-k: -bash: ulimit: -k: invalid option
ulimit: usage: ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]
-P: -bash: ulimit: -P: invalid option
ulimit: usage: ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]
-T: -bash: ulimit: -T: invalid option
ulimit: usage: ulimit [-SHabcdefiklmnpqrstuvxPT] [limit]

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