AWK

ls -lh | awk '{print $5, $9}'

cat /etc/passwd | awk -F':' '{print $1}' # 分隔符

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md5 *.m4a | awk '{ print $4 }'  | uniq -c | wc -l

ll | awk '{ print substr($5, 1, length($5)-1) }'

paste -s -d '+' file.txt

31+30+32+32+32+33+33+33+33+33+33+32+32+33+33+33+33+33+30+33+33+32+33+33+29+33+32+33+32+32+31+32+32+33+32+29+32+31+33+32+32+29+33+30+30+33+33+31+29+30+28+27+32+32+33+31+28+33+33+33+32+33+32+31+33+33+33+34+31+32+33+33+33+33+33+32+32+33+34+32+30+32+33+31+30+31+29+32+32+31+32+30+29+31+32+23+32+33+31+31

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Linux下查找并批量修改文件扩展名

find ./ -type f -name "*.less" | xargs rename "s/less/scss/"