shell脚本编程处理输入输出

1 $ cat read.sh 
2 #!/bin/bash
3 # test the read command
4 echo -n "please input your name: "
5 read name
6 echo "Hello $name"

read -p "please input your name: " name

read -p "please input your name: " first last
echo "Hello $first.$last"

read -t 5 -p "please input your name: " name

read -t 5 -s -p "please input your passwd: " passwd

ls -l badfile 2> test
$ cat test 
ls: 无法访问badfile: 没有那个文件或目录

ls -l goodfile badfile 2> test_err 1> test

echo "this is a error message" >&2

1 #!/bin/bash
2 #redirecting alloutput
3 exec 1>testfile
4 echo "this is a test of redirecting alloutput"