4918
5880
3万
GROAD
曲径通幽,安觅芳踪。
ls -l > lsouput.txt
set -o noclobber
bash: lsoutput.txt: cannot overwrite existing file
set -C
set +o noclobber
ls -l / >> lsoutput.txt
kill -HUP 1234 2>killerr.txt
kill -1 1234 >killerr.txt 2&>1
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