">" 操作符：覆盖目标文件内容
huey@huey-K42JE:~/huey/linux/cmdline$ date > foo huey@huey-K42JE:~/huey/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
huey@huey-K42JE:~/huey/linux/cmdline$ date >> foo huey@huey-K42JE:~/huey/linux/cmdline$ cat foo Fri May 8 09:55:42 CST 2015 Fri May 8 09:57:02 CST 2015
"2>" 操作符：覆盖目标文件内容
huey@huey-K42JE:~/huey/linux/cmdline$ ls inexistent_dir 2> ls-error.txt huey@huey-K42JE:~/huey/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
huey@huey-K42JE:~/huey/linux/cmdline$ ls inexistent_dir 2>> ls-error.txt huey@huey-K42JE:~/huey/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
"&>" 操作符：覆盖目标文件内容
huey@huey-K42JE:~/huey/linux/cmdline$ date &> foo huey@huey-K42JE:~/huey/linux/cmdline$ cat foo Fri May 8 10:16:12 CST 2015 huey@huey-K42JE:~/huey/linux/cmdline$ ls inexistent_dir &> foo huey@huey-K42JE:~/huey/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
huey@huey-K42JE:~/huey/linux/cmdline$ echo ‘hello world‘ > foo huey@huey-K42JE:~/huey/linux/cmdline$ date &>> foo huey@huey-K42JE:~/huey/linux/cmdline$ ls inexistent_dir &>> foo huey@huey-K42JE:~/huey/linux/cmdline$ cat foo hello world Fri May 8 10:25:24 CST 2015 ls: cannot access inexistent_dir: No such file or directory
"<" 操作符
huey@huey-K42JE:~/huey/linux/cmdline$ echo ‘hello world‘ > foo huey@huey-K42JE:~/huey/linux/cmdline$ cat < foo hello world
"|" 操作符
huey@huey-K42JE:~/huey/linux/cmdline$ ls /usr/bin | grep ‘^zip‘ zip zipcloak zipgrep zipinfo zipnote zipsplit
原文：http://www.cnblogs.com/huey/p/4487021.html