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功能:转换、挤压或删除字符串,从标准输入接收输入,输出到标准输出
基本用法:tr [options] string1 [string2]
$ echo "CDImage.CUE" | tr [A-Z] [a-z]
CDImage.cue
$ echo hi there | tr ‘[:lower:]‘ ‘[:upper:]‘
HI THERE
$ echo "hello, world" | tr -d ‘ ‘
hello,world
$ echo "If you can read this, you can spot the missing vowels!" | tr -d ‘aeiou‘
If y cn rd ths, y cn spt th mssng vwls!
$ echo "hellooooooo,world" | tr -s ‘o‘ //只挤压去重
hello,world
$ echo "tennessee" | tr -s ‘tnse‘ ‘srne‘ //先挤压去重->tenese,再转换->serene
serene
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原文地址:http://www.cnblogs.com/pandachen/p/5174168.html