echo文件内容

LIerWx

如题，我的文本是下面这样

1. ## Next comes the main part: which users can run what software on
   
2. ## which machines (the sudoers file can be shared between multiple
   
3. ## systems).
   
4. ## Syntax:
   
5. ##
   
6. ##      user    MACHINE=COMMANDS
   
7. ##
   
8. ## The COMMANDS section may have other options added to it.
   
9. ##
   
10. ## Allow root to run any commands anywhere
    
11. root    ALL=(ALL)       ALL
    
12. 
    
13. *       *=(*)           ALL
    
14. *       *=(aaa)         ALL
    
15. ## Allows members of the 'sys' group to run networking, software,
    
16. ## service management apps and more.
    
17. # %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS
    
18. 
    
19. ## Allows people in group wheel to run all commands
    
20. %wheel  ALL=(ALL)       ALL
    
21. 
    
22. ## Same thing without a password
    
23. # %wheel        ALL=(ALL)       NOPASSWD: ALL
    
24. 
    
25. ## Allows members of the users group to mount and unmount the
    
26. ## cdrom as root
    
27. # %users  ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom

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我在脚本里判断时要打印信息，如下：

1. [root@localhost  ~]#
   
2. [root@localhost  ~]# cat /etc/sudoers | sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d'
   
3. *        *=(*)                ALL
   
4. [root@VM1 ~]#
   

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但我在echo `cat /etc/sudoers | sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d'` 时，却把当前目录的内容也打印出来了 最后那段才是我要的信息，要如何只显示命令输出内容？

1. [root@localhost ~]# echo `cat /etc/sudoers | sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d'`
   
2. a.md5 anaconda-ks.cfg a.sh a.txt auth_14.sh AUTH_15.sh b.sh Desktop Documents Downloads Music mysql-5.7.14-linux-glibc2.5-x86_64.tar.gz nginx-1.11.4 nginx-1.11.4.tar.gz php-5.6.26 php-5.6.26.tar.gz Pictures Public Templates Videos zabbix-3.0.0beta1 zabbix-3.0.0beta1.tar.gz *=(*) ALL
   
3. [root@localhost ~]#
   

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moperyblue

1. sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' /etc/sudoers

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?

LIerWx

回复 2# moperyblue

1. [root@VM1 ~]#
   
2. [root@VM1 ~]# echo `sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' /etc/sudoers`
   
3. 1.txt a.md5 anaconda-ks.cfg a.sh a.txt auth_14.sh AUTH_15.sh b.sh Desktop Documents Downloads Music mysql-5.7.14-linux-glibc2.5-x86_64.tar.gz nginx-1.11.4 nginx-1.11.4.tar.gz php-5.6.26 php-5.6.26.tar.gz Pictures Public Templates Videos zabbix-3.0.0beta1 zabbix-3.0.0beta1.tar.gz *=(*) ALL
   
4. [root@VM1 ~]#
   

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不行的，echo出来还是会显示当前目录下文件。。。

moperyblue

为什么要echo? 你想达到什么结果?

LIerWx

回复 4# moperyblue

1. #!/bin/bash
   
2. sdo=`cat /etc/sudoers | sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' |wc -l`
   
3. if [ $sdo -ge 1 ];then
   
4.          echo `sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' /etc/sudoers`
   
5. else
   
6.         echo 1
   
7. fi
   

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运行脚本，存在*    *=(*)        ALL 这行的就把他打印出来，但打印老是报那个错

moperyblue

1. #!/bin/bash
   
2. sdo=`cat /etc/sudoers | sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' |wc -l`
   
3. if [ $sdo -ge 1 ];then
   
4.     sed -r '/^\s*\*\s+\*=\(\*\)\s+ALL\s*$/!d' /etc/sudoers
   
5. else
   
6.     echo 1
   
7. fi

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回复 5# LIerWx

LIerWx

回复 6# moperyblue

可以了 多谢大神