Shell按行读取文件的3种方法

1 [root@mini05 20180930-2]# cat file.info 
2 111
3 222
4 333 444
5 555 666

 1 [root@mini05 20180930-2]# cat read1.sh 
 2 #!/bin/bash
 3 ################ Version Info ##################
 4 # Create Date: 2018-09-29
 5 # Author:      zhang
 6 # Mail:        zhang@xxx.com
 7 # Version:     1.0
 8 # Attention:   按行读取文件
 9 ################################################
10 
11 # 加载环境变量
12 . /etc/profile
13 . ~/.bash_profile
14 . /etc/bashrc
15 
16 # 脚本所在目录及脚本名称
17 script_dir=$( cd "$( dirname "$0"  )" && pwd )
18 script_name=$(basename ${0})
19 
20 exec < ${script_dir}/file.info
21 while read line; do
22   echo "${line}"
23 done

 1 [root@mini05 20180930-2]# cat read2.sh 
 2 #!/bin/bash
 3 ################ Version Info ##################
 4 # Create Date: 2018-09-29
 5 # Author:      zhang
 6 # Mail:        zhang@xxx.com
 7 # Version:     1.0
 8 # Attention:   按行读取文件
 9 ################################################
10 
11 # 加载环境变量
12 . /etc/profile
13 . ~/.bash_profile
14 . /etc/bashrc
15 
16 # 脚本所在目录及脚本名称
17 script_dir=$( cd "$( dirname "$0"  )" && pwd )
18 script_name=$(basename ${0})
19 
20 cat ${script_dir}/file.info | while read line;do
21   echo "${line}"
22 done

 1 [root@mini05 20180930-2]# cat read3.sh 
 2 #!/bin/bash
 3 ################ Version Info ##################
 4 # Create Date: 2018-09-29
 5 # Author:      zhang
 6 # Mail:        zhang@xxx.com
 7 # Version:     1.0
 8 # Attention:   按行读取文件
 9 ################################################
10 
11 # 加载环境变量
12 . /etc/profile
13 . ~/.bash_profile
14 . /etc/bashrc
15 
16 # 脚本所在目录及脚本名称
17 script_dir=$( cd "$( dirname "$0"  )" && pwd )
18 script_name=$(basename ${0})
19 
20 while read line; do
21   echo "${line}"
22 done < ${script_dir}/file.info