tr可以对标准输入的字符进行替换、删除、压缩

1、替换

-bash-3.2# cat 1.txt
a b c

-bash-3.2# cat 1.txt |tr ‘a-c’ ‘A-C’
A B C

2、删除某个字符

-bash-3.2# cat 1.txt |tr -d ‘c’
a b

3、过虑字符

-bash-3.2# cat 2.txt
hello2 shell3

-bash-3.2# cat 2.txt |tr -d -c ‘a-z \n’
hello shell

4、压缩

-bash-3.2# echo “linux and windows”|tr -s ‘ ‘#三个空格
linux and windows

5、简单计算

-bash-3.2# cat 1.txt
1 2 3 4 5 6

-bash-3.2# cat 1.txt |echo $[ $( tr ' ' '+' ) ]
21

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