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화일 다루기
file permission & misc.
ls
cd, pushd, popd, dirs, , pwd
cp, mv, rm, ln
mkdir, rmdir
cat
file
whereis, which, find
df, du
tar
gzip, compress, uncompress, zcat
그 외의 것들
man, whatis
who, w, finger, users
grep
jobs, ps
사용예
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