find参数exec管道符|xargs的区别

Posted 2020-06-24 mofy

1.这三个命令都可以将前面的输出做为后面的输入。

2.他们对于前面的输出，处理方式不同。

 

find . -name "*.sh" -exec cat {} \;

find . -name "*.sh" |cat

find . -name "*.sh" |xargs cat

 示例一：

[[email protected] temp]# cat ex.sh 
a.txt
b.txt
c.txt
d.txt
5.txt
[[email protected] temp]# find . -name "ex.sh" -exec cat {} \;
a.txt
b.txt
c.txt
d.txt
5.txt
[[email protected] temp]# find . -name "ex.sh"|cat
./ex.sh
[[email protected] temp]# find . -name "ex.sh"|xargs cat
a.txt
b.txt
c.txt
d.txt
5.txt
[[email protected] temp]# 

 示例二：

[[email protected] django]# find . -name "*.py"
./siteone/blog/models.py
./siteone/blog/__init__.py
./siteone/blog/migrations/__init__.py
./siteone/blog/tests.py
./siteone/blog/views.py
./siteone/blog/admin.py
./siteone/siteone/urls.py
./siteone/siteone/__init__.py
./siteone/siteone/settings.py
./siteone/siteone/wsgi.py
./siteone/manage.py
[[email protected] django]# find . -name "*.py" -exec echo {} \;
./siteone/blog/models.py
./siteone/blog/__init__.py
./siteone/blog/migrations/__init__.py
./siteone/blog/tests.py
./siteone/blog/views.py
./siteone/blog/admin.py
./siteone/siteone/urls.py
./siteone/siteone/__init__.py
./siteone/siteone/settings.py
./siteone/siteone/wsgi.py
./siteone/manage.py
[[email protected] django]# find . -name "*.py" |echo 

[[email protected] django]# find . -name "*.py" |xargs echo 
./siteone/blog/models.py ./siteone/blog/__init__.py ./siteone/blog/migrations/__init__.py ./siteone/blog/tests.py ./siteone/blog/views.py ./siteone/blog/admin.py ./siteone/siteone/urls.py ./siteone/siteone/__init__.py ./siteone/siteone/settings.py ./siteone/siteone/wsgi.py ./siteone/manage.py
[[email protected] django]# 

总结：

exec会对每一个find找到的文件，执行一次命令。

xargs是把所有找到的文件名分割成一个一个的参数传递给命令

不用xargs的管道符是将前面的标准输出，做为后面命令的标准输入

带有xargs的管道符是将前面的标准输出，做为后面命令的参数