编辑命令：
d：删除
p：打印
i \text
a \text
r /path/to/somefile：在指定位置把另外一个文件的内容插入进来
w /path/to/somefile：将符合条件的所有行保存至指定的文件中
=： 显示符合条件的行的行号
s///：查找条件可以使用模式，但要替换的内容不行
地址定界：
startline，endline
1，3
/pat1/，/pat2/
/pattern/
用法： sed [option] 'addr1[,addr2]编辑命令 ' FILE
sed [option] "addr1[,addr2]编辑命令" FILE
选项：
-n：静默模式，不输出模式空间的内容：
-r：扩展的正则表达式
-f /path/to/sed_script_file：指定sed脚本文件
-e `script' -e 'script'：指定多个编辑指令
一、删除命令
sed 'd'
1、删除/etc/fstab的第一行到第三行
[root@localhost ~]# sed '1,3d' /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]# sed -n '1,3d' /etc/fstab
2、删除所有以#号开头的行
[root@localhost ~]# sed '/^#/d' /etc/fstab
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
3、删除以斜线开头的行
[root@localhost ~]# sed '/^\//d' /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
二、显示打印命令
三、添加或追加
1、在以#开头的行后加上hello 和line两个词
[root@localhost ~]# sed '/^#/a \hello /line' /etc/fstab
#
hello /line
# /etc/fstab
hello /line
# Created by anaconda on Tue Mar 21 07:38:31 2017
hello /line
#
hello /line
# Accessible filesystems, by reference, are maintained under '/dev/disk'
hello /line
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
hello /line
2、在以#开头的行前面加上hello 和line两个词
[root@localhost ~]# sed '/^#/i \hello /line' /etc/fstab
hello /line
#
hello /line
# /etc/fstab
hello /line
# Created by anaconda on Tue Mar 21 07:38:31 2017
hello /line
#
hello /line
# Accessible filesystems, by reference, are maintained under '/dev/disk'
hello /line
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
hello /line
#
3、在以大写字母开头的行后追加first line和second line 两行字符
[root@localhost ~]# sed '/^[[:upper:]]/a \first line. \nsecond line.' /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
first line.
second line.
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
first line.
second line.
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
first line.
second line.
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
first line.
second line.
4、把/etc/issue该文件插入到/etc/fstab下以UUID开头的行的下面
[root@localhost ~]# sed '/^UUID/r /etc/issue' /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
CentOS release 6.5 (Final)
Kernel \r on an \m
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
CentOS release 6.5 (Final)
Kernel \r on an \m
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
CentOS release 6.5 (Final)
Kernel \r on an \m
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
CentOS release 6.5 (Final)
Kernel \r on an \m
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
5、将/etc/fstab里以#号开头的行，保存至/tmp/filetable.txt里
[root@localhost ~]# sed '/^#/w /tmp/filetable.txt' /etc/fstab
#
# /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
UUID=8b0e83ad-60ca-43cc-a356-7c8f9c86497b / ext4 defaults 1 1
UUID=91705c7f-8b89-4eef-b281-b66d66900451 /boot ext4 defaults 1 2
UUID=44173a75-09b4-466c-b1c7-8202c571f04f /opt ext4 defaults 1 2
UUID=7f07495a-9e48-49df-83fb-e7c81f4e318e swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]# cat /tmp/filetable.txt
#
# /etc/fstab
# Created by anaconda on Tue Mar 21 07:38:31 2017
#
# 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
#
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