去除重复的字符 tr -s "[a-z]" < example.txt
cat example.txt | tr -s "[a-z]"
删除空行 cat example.txt | tr -s "[\n]"
cat example.txt | tr -s "[2]"
小写到大写 cat example.txt | tr "[a-z]" "[A-Z]"
cat example.txt | tr "[:lower:]" "[:upper:]"
大写到小写 与上例相反
Dos到Unix cat example.txt | tr -s "[52]" "[2*]"
cat example.txt | tr -s "[\r2]" "[\n*]"
删除所有的tab代之以空格 cat example.txt | tr -s "[1]" "[0*]"
cat example.txt | tr -s "[\t]" "[0*]"
去除passwd的:以tab键代替增加可读性 cat /etc/passwd | tr -s "[:]" "[1]"
cat /etc/passwd | tr -s "[:]" "[\t]"
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