大写转小写：echo "HELLO WHO IS THIS" | tr 'A-Z' 'a-z'
制表符转空格：tr '\t' ' ' < file.txt
ROT13: echo "tr came,tr saw,tr conquered" | tr 'a-zA-Z' 'n-za-mN-ZA-M'
删除字符：echo "Hello 123" | tr -d '0-9'
补集：echo hello 1 char 2 | tr -d -c '0-9 \n' 1 除了数字、空格、换行
压缩：echo "GNU is not" | tr -s ' ' GNU is not
加：cat sum.txt | echo $[$(tr '\n' '+') 0] 1+2+3+0
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