Linux 重定向与管道
2014 年 3 月 22 日
标准输出重定向
“>” 操作符：覆盖目标文件内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ date > foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat foo Fri May 8 09:55:42 CST 2015
“>>” 操作符：在目标文件尾部追加输出内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ date >> foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat foo Fri May 8 09:55:42 CST 2015 Fri May 8 09:57:02 CST 2015
标准错误重定向
“2>” 操作符：覆盖目标文件内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ ls inexistent_dir 2> ls-error.txt linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat ls-error.txt ls: cannot access inexistent_dir: No such file or directory
“2>>” 操作符：在目标文件尾部追加输出内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ ls inexistent_dir 2>> ls-error.txt linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat ls-error.txt ls: cannot access inexistent_dir: No such file or directory ls: cannot access inexistent_dir: No such file or directory
将标准输出与标准错误重定向到同一文件
“&>” 操作符：覆盖目标文件内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ date &> foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat foo Fri May 8 10:16:12 CST 2015 linuxidc@linuxidc:~/linuxidc/linux/cmdline$ ls inexistent_dir &> foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat foo ls: cannot access inexistent_dir: No such file or directory
“&>>” 操作符：在目标文件尾部追加输出内容
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ echo 'hello world' > foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ date &>> foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ ls inexistent_dir &>> foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat foo hello world Fri May 8 10:25:24 CST 2015 ls: cannot access inexistent_dir: No such file or directory
标准输入重定向
“<" 操作符
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ echo 'hello world' > foo linuxidc@linuxidc:~/linuxidc/linux/cmdline$ cat < foo hello world
管道
“|” 操作符
linuxidc@linuxidc:~/linuxidc/linux/cmdline$ ls /usr/bin | grep '^zip' zip zipcloak zipgrep zipinfo zipnote zipsplit
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