xargs:能够将管道或者标准输入传递的数据转换成xargs命令后面跟随的参数
ghostwu@dev:~/linux/cp$ ls
ghostwu_hardlink ghostwu_home ghostwu_softlink ghostwu.txt
ghostwu@dev:~/linux/cp$ cat ghostwu.txt
1 2 3
4 5 6 7
8 9 10
ghostwu@dev:~/linux/cp$ xargs < ghostwu.txt
1 2 3 4 5 6 7 8 9 10
把ghostwu.txt文件的内容 通过输入重定向 传递给xargs，相当于echo 1 2 3 4 5 6 7 8 9 10
-n: 指定一行显示几个
ghostwu@dev:~/linux/cp$ xargs -n 2 < ghostwu.txt
1 2
3 4
5 6
7 8
9 10
-d：指定分隔符
ghostwu@dev:~/linux/cp$ echo a-b-c-d
a-b-c-d
ghostwu@dev:~/linux/cp$ echo a-b-c-d | xargs -d -
a b c d
-i: 以{}替代前面的结果，经常跟find命令结合使用
把家目录下.py结尾的文件 复制 到tmp目录下
ghostwu@dev:~$ ls
Desktop examples.desktop linux Pictures python tmp
Documents git_test Music project software Videos
Downloads info php Public Templates
ghostwu@dev:~$ ls tmp
ghostwu@dev:~$ find . -name "*.py" | xargs -i cp -a {} tmp/
ghostwu@dev:~$ ls tmp
for.py func3.py func5.py global2.py while1.py
func2.py func4.py func.py global.py while.py
删除tmp下以.py结尾的文件
ghostwu@dev:~$ ls tmp
for.py func3.py func5.py global2.py while1.py
func2.py func4.py func.py global.py while.py
ghostwu@dev:~$ touch tmp/{a..f}.txt
ghostwu@dev:~$ ls tmp
a.txt c.txt e.txt f.txt func3.py func5.py global2.py while1.py
b.txt d.txt for.py func2.py func4.py func.py global.py while.py
ghostwu@dev:~$ find ./tmp -name "*.py" | xargs -i rm -rf {}
ghostwu@dev:~$ ls tmp
a.txt b.txt c.txt d.txt e.txt f.txt
创建带空格的文件
ghostwu@dev:~/tmp$ touch "hello ghostwu.txt"
ghostwu@dev:~/tmp$ ls
a.txt b.txt c.txt d.txt e.txt f.txt hello ghostwu.txt
ghostwu@dev:~/tmp$ touch hi\ ghostwu.txt
ghostwu@dev:~/tmp$ ls
a.txt b.txt c.txt d.txt e.txt f.txt hello ghostwu.txt hi ghostwu.txt
ghostwu@dev:~/tmp$ rm hello\ ghostwu.txt
ghostwu@dev:~/tmp$ ls
a.txt b.txt c.txt d.txt e.txt f.txt hi ghostwu.txt
ghostwu@dev:~/tmp$ rm hi\ ghostwu.txt
ghostwu@dev:~/tmp$ ls
a.txt b.txt c.txt d.txt e.txt f.txt
不能删除带有空格的文件
ghostwu@dev:~/tmp$ ls
alltxt.tar.gz b.txt d.txt f.txt hi ghostwu.txt
a.txt c.txt e.txt hello ghostwu.txt
ghostwu@dev:~/tmp$ find . -name "*.txt" | xargs rm
rm: cannot remove './hello': No such file or directory
rm: cannot remove 'ghostwu.txt': No such file or directory
rm: cannot remove './hi': No such file or directory
rm: cannot remove 'ghostwu.txt': No such file or directory
ghostwu@dev:~/tmp$ ls
alltxt.tar.gz hello ghostwu.txt hi ghostwu.txt
用man手册查找find 中 -print0选项
-print0
True; print the full file name on the standard output, followed
by a null character (instead of the newline character that
-print uses). This allows file names that contain newlines or
other types of white space to be correctly interpreted by pro‐
grams that process the find output. This option corresponds to
the -0 option of xargs.
意思大概就是 find 命令的-print0选项启用之后，会把文件名中包含换行或者其他空白字符正确的解释出来。这个选项通常跟 xargs 的 -0选项结合使用
所以，可以向下面这种方式，执行xargs
ghostwu@dev:~/tmp$ ls
alltxt.tar.gz b.txt d.txt f.txt hi ghostwu.txt
a.txt c.txt e.txt hello ghostwu.txt
ghostwu@dev:~/tmp$ find . -name "*.txt" -print0 | xargs -0 rm
ghostwu@dev:~/tmp$ ls
alltxt.tar.gz
查找家目录下面所有的.py文件，然后打包
ghostwu@dev:~/tmp$ ls
ghostwu@dev:~/tmp$ find ~ -name "*.py" | xargs tar cvf allpy.tar.gz
tar: Removing leading `/' from member names
/home/ghostwu/python/func2.py
/home/ghostwu/python/func3.py
/home/ghostwu/python/func4.py
/home/ghostwu/python/func.py
/home/ghostwu/python/global.py
/home/ghostwu/python/global2.py
/home/ghostwu/python/while.py
/home/ghostwu/python/for.py
/home/ghostwu/python/func5.py
/home/ghostwu/python/while1.py
ghostwu@dev:~/tmp$ ls
allpy.tar.gz
ghostwu@dev:~/tmp$ tar -tvf allpy.tar.gz
-rw-rw-r-- ghostwu/ghostwu 179 2018-03-18 21:29 home/ghostwu/python/func2.py
-rw-rw-r-- ghostwu/ghostwu 58 2018-03-18 21:31 home/ghostwu/python/func3.py
-rw-rw-r-- ghostwu/ghostwu 81 2018-03-18 21:33 home/ghostwu/python/func4.py
-rw-rw-r-- ghostwu/ghostwu 44 2018-03-18 21:26 home/ghostwu/python/func.py
-rw-rw-r-- ghostwu/ghostwu 150 2018-03-18 21:53 home/ghostwu/python/global.py
-rw-rw-r-- ghostwu/ghostwu 124 2018-03-18 21:55 home/ghostwu/python/global2.py
-rw-rw-r-- ghostwu/ghostwu 90 2018-03-18 21:19 home/ghostwu/python/while.py
-rw-rw-r-- ghostwu/ghostwu 82 2018-03-18 21:08 home/ghostwu/python/for.py
-rw-rw-r-- ghostwu/ghostwu 99 2018-03-18 21:48 home/ghostwu/python/func5.py
-rw-rw-r-- ghostwu/ghostwu 92 2018-03-18 21:23 home/ghostwu/python/while1.py
