Redirect
Output redirection integrated case
output is redirected into normal output and error output
Normal output
1> is equivalent to>
1 >> >> equivalent to the
error output
2 >>
2>
Case 1, output redirection
date 1> date.txt
date >> date.txt
Case II: error output redirection
ls /home/ 2> list.txt //错误示范
ls /aaaaaaaaa 2> list.txt //正确示范
cat list.txt
pipeline
About
Pipe command can combine multiple commands, one-time completion of complex processing tasks
cases
cat /etc/passwd | tail -3 //查看后三行etc下的passwd文件
ps aux | grep 'sshd' //只看sshd
pipe tee
pipe tee, i.e., processing to another program. And keep a copy of
the parameter passed xargs
cat files.txt | xargs rm -rvf //通过xargs 连接rm命令
