Linux系统管理：筛选netstat命令结果与编辑fstab文件-优快云博客

本文链接：https://blog.youkuaiyun.com/a15183865601/article/details/130069624

文章展示了如何使用Linux命令netstat过滤出监听状态（LISTEN）的网络连接，并利用sed工具处理/etc/fstab文件，包括在非注释行前添加#号以及删除以#开头的注释字符。

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1、找出"netstat -tan”命令的结果中，以‘LISTEN’后跟0或多个空白字符结尾的行
2、在/etc/fstab文件中不以#开头的行的行首增加#号
3、删除/etc/fstab文件中所有以#开头的#字符

[root@sb ~]# netstat -tan | grep '\(LISTEN[[:space:]]*\)$'
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:631                 :::*                    LISTEN     
tcp6       0      0 :::111                  :::*                    LISTEN     
[root@sb ~]#

[root@localhost ]# sed "s/^[^#]/#/" /etc/fstab
 
#
# /etc/fstab
# Created by anaconda on Thu Apr  6 09:20:08 2023
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
#dev/mapper/rhel-root   /                       xfs     defaults        0 0
#UID=f7e1da57-79b9-4254-be42-45fbb0bc7c05 /boot                   xfs     defaults        0 0
#dev/mapper/rhel-swap   none                    swap    defaults        0 0
#dev/sr0 /cdrom iso9660 defaults,_netdev 0 0

[root@localhost aaa]# sed "s/#//" /etc/fstab
 
 
 /etc/fstab
 Created by anaconda on Thu Apr  9 18:20:39 2023
 
 Accessible filesystems, by reference, are maintained under '/dev/disk/'.
 See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
 
 After editing this file, run 'systemctl daemon-reload' to update systemd
 units generated from this file.
 
/dev/mapper/rhel-root   /                       xfs     defaults        0 0
UUID=f7e1da57-79b9-4254-be42-45fbb0bc7c05 /boot                   xfs     defaults        0 0
/dev/mapper/rhel-swap   none                    swap    defaults        0 0
/dev/sr0 /cdrom iso9660 defaults,_netdev 0 0