本文给大家介绍了一些touch命令的用法。touch一般用来创建一个新文件。同时，touch还可以用来修改文件时间戳。
创建新文件：
$ ls -l /tmp/foo
ls: /tmp/foo: No such file or directory
$ touch /tmp/foo
$ ls -l /tmp/foo
-rw-r--r-- 1 andy wheel 0 Jul 10 11:56 /tmp/foo
touch还可以用来修改文件时间戳。
-t 参数可以指定要修改成的具体时间
$ ls -l /tmp/foo
ls: /tmp/foo: No such file or directory
$ touch -t 201107010930 /tmp/foo
$ ls -l /tmp/foo
-rw-r--r-- 1 andy wheel 0 Jul 1 09:30 /tmp/foo
若没有指定，则设置为当前时间：
$ ls -l /tmp/foo
-rw-r--r-- 1 andy wheel 0 Jul 1 09:30 /tmp/foo
$ touch /tmp/foo
$ ls -l /tmp/foo
-rw-r--r-- 1 andy wheel 0 Jul 10 11:58 /tmp/foo
You can also use the timestamp from another file and apply it to another file by using the -r switch.
$ ls -l /tmp/someotherfile
-rw-r--r-- 1 andy wheel 0 Aug 12 2005 /tmp/someotherfile
$ touch -r /tmp/someotherfile /tmp/foo /tmp/foo2 /tmp/foo3
$ ls -al /tmp/
-rw-r--r-- 1 andy wheel 0 Aug 12 2005 /tmp/foo
-rw-r--r-- 1 andy wheel 0 Aug 12 2005 /tmp/foo2
-rw-r--r-- 1 andy wheel 0 Aug 12 2005 /tmp/foo3
-rw-r--r-- 1 andy wheel 0 Aug 12 2005 /tmp/someotherfile