Linux系统管理：筛选netstat监听状态与修改fstab配置-优快云博客

文章展示了如何使用Linux命令netstat筛选出处于监听状态(Listen)的网络连接，并利用sed命令对/etc/fstab文件进行操作，包括在非注释行前添加#号以及删除以#开头的注释符。

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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

[root@localhost ~]# netstat -tan | grep "\<LISTEN *\>"
tcp        0      0 0.0.0.0:111             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      0 127.0.0.1:6010          0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:6011          0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:6012          0.0.0.0:*               LISTEN
tcp6       0      0 :::111                  :::*                    LISTEN
tcp6       0      0 :::80                   :::*                    LISTEN
tcp6       0      0 :::22                   :::*                    LISTEN
tcp6       0      0 ::1:631                 :::*                    LISTEN
tcp6       0      0 ::1:6010                :::*                    LISTEN
tcp6       0      0 ::1:6011                :::*                    LISTEN
tcp6       0      0 :::443                  :::*                    LISTEN
tcp6       0      0 ::1:6012                :::*                    LISTEN

[root@localhost ~]# netstat -tan | grep "LISTEN[[:space:]]*$"
tcp        0      0 0.0.0.0:111             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      0 127.0.0.1:6010          0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:6011          0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:6012          0.0.0.0:*               LISTEN
tcp6       0      0 :::111                  :::*                    LISTEN
tcp6       0      0 :::80                   :::*                    LISTEN
tcp6       0      0 :::22                   :::*                    LISTEN
tcp6       0      0 ::1:631                 :::*                    LISTEN
tcp6       0      0 ::1:6010                :::*                    LISTEN
tcp6       0      0 ::1:6011                :::*                    LISTEN
tcp6       0      0 :::443                  :::*                    LISTEN
tcp6       0      0 ::1:6012                :::*                    LISTEN

2、在/etc/fstab文件中不以#开头的行的行首增加#号

[root@localhost ~]# sed -r 's/^[^\#]/#&/' /etc/fstab

#
# /etc/fstab
# Created by anaconda on Tue Mar 21 03:30:28 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.
#
#UUID=e2ccabb1-875b-4709-8e38-b69ec6fc7858 /                       xfs     defaults        0 0
#UUID=f1f07d9a-5d9a-4628-b626-5883a612c11c /boot                   xfs     defaults        0 0
#UUID=ab821a8f-4b4c-4bc0-8556-4d78792efccd none                    swap    defaults        0 0

3、删除/etc/fstab文件中所有以#开头的#字符

[root@localhost ~]# sed -r 's/^#[[:space:]]*//' /etc/fstab

/etc/fstab
Created by anaconda on Tue Mar 21 03:30:28 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.

UUID=e2ccabb1-875b-4709-8e38-b69ec6fc7858 /                       xfs     defaults        0 0
UUID=f1f07d9a-5d9a-4628-b626-5883a612c11c /boot                   xfs     defaults        0 0
UUID=ab821a8f-4b4c-4bc0-8556-4d78792efccd none                    swap    defaults        0 0