作用：从标准输入中替换，缩减或者删除字符linux常用命令，并将结果输出到标准输出
格式：tr [option] [set1] [set2]
tr [选项] [字符1] [字符2]
把y替换m, o替换elinux常用命令，并不仅仅是yo替换me
ghostwu@dev:~/linux/tr$ cat ghostwu.txt hello,my name is ghostwu, my qq is 359173352@qq.com my blog is http://www.cnblogs.com/ghostwu nice to meet you, feel free to contact me. ghostwu@dev:~/linux/tr$ tr 'me' 'yo' < ghostwu.txt hollo,yy nayo is ghostwu, yy qq is 359173352@qq.coy yy blog is http://www.cnblogs.coy/ghostwu nico to yoot you, fool froo to contact yo.
小写字母变成大写
ghostwu@dev:~/linux/tr$ tr '[a-z]' '[A-Z]' < ghostwu.txt HELLO,MY NAME IS GHOSTWU, MY QQ IS 359173352@QQ.COM MY BLOG IS HTTP://WWW.CNBLOGS.COM/GHOSTWU NICE TO MEET YOU, FEEL FREE TO CONTACT ME.
-d: 删除. 删除数字
ghostwu@dev:~/linux/tr$ tr -d '[0-9]' < ghostwu.txt hello,my name is ghostwu, my qq is @qq.com my blog is http://www.cnblogs.com/ghostwu nice to meet you, feel free to contact me.
删除a, b, c中出现的任意一个字母
ghostwu@dev:~/linux/tr$ tr -d ['a-c'] < ghostwu.txt hello,my nme is ghostwu, my qq is 359173352@qq.om my log is http://www.nlogs.om/ghostwu nie to meet you, feel free to ontt me.
删除文件中的换行符
ghostwu@dev:~/linux/tr$ tr -d '\n' < ghostwu.txt hello,my name is ghostwu,my qq is 359173352@qq.commy blog is http://www.cnblogs.com/ghostwunice to meet you,feel free to contact me.
-s:保留连续字符的第一个，其他的删除。 压缩连续字符
ghostwu@dev:~/linux/tr$ echo 'gggghhostwwwu' | tr -s ghostwu ghostwu
-c：取反。 把所有的非数字都变成＃
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