sed命令
-n 静默模式，不输出模式空间中的内容
编辑命令：
d:删除
地址定界：
startline，endline
1,3
/part1/,/part2/ 匹配范围之间
/part/ 匹配到所匹配的字符
-n:静默模式，只显示匹配字符串或者行.
a 在当前行下面插入文本。
i 在当前行上面插入文本。
r:在匹配航之后引入另一个文件内容.
w:将匹配到的行输出到另一个文件.
p:将匹配的行打印出来(也会输出原文件的内容)，pn只显示打印的行.
[[:upper:]] 匹配以大写字母开头的行.
=:显示匹配行的行号，-n和=同时使用，只输出匹配行的行号.
[^]:匹配一个不在指定范围内的字符.
^ 匹配行开始，如：/^sed/匹配所有以sed开头的行。
$ 匹配行结束，如：/sed$/匹配所有以sed结尾的行。
. 匹配一个非换行符的任意字符，如：/s.d/匹配s后接一个任意字符，最后是d。 * 匹配0个或多个字符，如：/*sed/匹配所有模板是一个或多个空格后紧跟sed的行。
-f /path/to/sed_script_file :指定sed脚本文件.
-e 'script' -e 'script':指定多个编辑命令
正则表达式：
基本的：
字符：. [] [^]
次数：* \? \{\}
锚定：^ $ \< \>
分组：\(\)
引用：\1,\2,...
扩展：
字符：. [] [^]
[[:lower:]]:匹配所有的小写
[[:punct:]]:匹配所有的标点符号
[[:alnum:]]:匹配所有的数字
次数：
* ？ + {m,n}
锚定：
^ $ \> \<
或：
a|b
分组：
()
引用：
\1,\2
sed '地址定界s@查找条件@替换文本@' :在指定的定界内查找匹配到的条件做替换
修饰符：
g:global，全局替换
i:ignore-case不区分大小写
1）、[root@localhost ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Feb 24 02:20:51 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
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap 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 '1,3d' /etc/fstab
# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
-n 参数
sed -n '1,3d' /etc/fstab 不会输出任何东西，静默模式
2）、删除所有以#号开头的行：
[root@localhost ~]# sed '/^#/d' /etc/fstab /dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
3）、删除所有以/ 开头的行：
[root@localhost ~]# sed '/^\//d' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
4）、删除从第2行开始，到第一次以“/”开头的行：
[root@localhost ~]# sed '2,/^\//d' /etc/fstab
UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
5）、删除第一个#号开头的行到第一个"/"，开头的行：
[root@localhost ~]# sed '/^#/,/^\//d' /etc/fstab
UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
-p 打印参数
6）、打印第一个#号开头的行到第一个"/"，开头的行，如果不加-n参数静默模式，会输出重复匹配的内容：
[root@localhost ~]# sed -n '/^#/,/^\//p' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
不加-n参数结果：
[root@localhost ~]# sed '/^#/,/^\//p' /etc/fstab
### /etc/fstab# /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 2017# Created by anaconda on Fri Feb 24 02:20:51 2017### Accessible filesystems, by reference, are maintained under '/dev/disk'# 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# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info##/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
a和i参数：
a：在匹配的行之后添加内容
i: 在匹配的行之前添加内容
#再#号开头的行之后添加hello world
# sed '/^#/a \hello world' /etc/fstab
#hello world# /etc/fstabhello world# Created by anaconda on Fri Feb 24 02:20:51 2017hello world#hello world# Accessible filesystems, by reference, are maintained under '/dev/disk'hello world# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more infohello world#hello world/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
#在匹配的行之前添加hello world字段。
# sed '/^\//i \hello world' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#hello world/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2hello world/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
匹配在大写字母开头的行之后添加二行，第一行hello，第二行second。注释：匹配大写字母以[[:upper:]]
# sed '/^[[:upper:]]/a \hello \nsecond' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2hello second/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
r 命令 /path/to/somefile :在指定位置把另一个文件的内容插入进来。
# sed '/^UUID/r /etc/issue' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2CentOS release 6.5 (Final)Kernel \r on an \m/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
结果：
w:/path/to/somefile:将符合条件的所有行保存至指定文件
# sed '/^UUID/w /tmp/uuid.txt' /etc/fstab ## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0查看/tmp/uuid.txt的文件内容。[root@localhost ~]# cat /tmp/uuid.txt UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2
=： 只显示匹配行的行号
# sed '/^UUID/=' /etc/fstab
## /etc/fstab# Created by anaconda on Fri Feb 24 02:20:51 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 110UUID=2020ea71-49cf-488e-bd6c-de72a001082b /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
结果：
# sed -n '/^UUID/=' /etc/fstab
10
s///：查找条件可以使用模式，但要替换的内容不能使用
# cat sed.txt
He like his liker.
He like his lover.
She love her liker.
She love her lover.
sed 匹配使用'//',匹配内容(l..e)的行，.* 表示后面出现多次的，1表示第一次匹配到的前两行匹配到like，后两行匹配到love。1r代表liker和lover.
# sed '/\(l..e\).*\1r/d' sed.txt
He like his lover.She love her liker.
#去掉r匹配也能成功.
# sed '/\(l..e\).*\1/d' sed.txt
He like his lover.She love her liker.
行首为#号开头的行替换为空行。
# sed 's/^#//g' /etc/fstab
/etc/fstab Created by anaconda on Wed Apr 19 00:39:18 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/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
删除空白行：
root@localhost ~]# sed '/^$/d' /etc/fstab
## /etc/fstab# Created by anaconda on Wed Apr 19 00:39:18 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
替换行首以#行开头的行后面跟至少一个空白字符的行替为空.
sed 's/^#[[:space:]]\{1,\}//g' /etc/fstab
sed 's/^#[[:space:]]\+//g' /etc/fstab
#/etc/fstabCreated by anaconda on Wed Apr 19 00:39:18 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#/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0tmpfs /dev/shm tmpfs defaults 0 0devpts /dev/pts devpts gid=5,mode=620 0 0sysfs /sys sysfs defaults 0 0proc /proc proc defaults 0 0
删除以空白为行首开始的行的空白
sed 's/^[[:space:]]\+//' /etc/grub.conf
sed 's/^[[:space:]]\{1,\}//' /etc/grub.conf
# grub.conf generated by anaconda## Note that you do not have to rerun grub after making changes to this file# NOTICE: You have a /boot partition. This means that# all kernel and initrd paths are relative to /boot/, eg.# root (hd0,0)# kernel /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root# initrd /initrd-[generic-]version.img#boot=/dev/sdadefault=0timeout=5splashp_w_picpath=(hd0,0)/grub/splash.xpm.gzhiddenmenutitle CentOS (2.6.32-431.el6.x86_64)root (hd0,0)kernel /vmlinuz-2.6.32-431.el6.x86_64 ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quietinitrd /initramfs-2.6.32-431.el6.x86_64.img
# echo /etc/sysconfig/network | sed 's@[^/]\{1,\}/\?$@@'
/etc/sysconfig/
-f sed执行运行的脚本文件，如果多行可以换行写.
[root@localhost ~]# echo /etc/sysconfig/network | sed 's@[^/]\{1,\}/\?$@@'/etc/sysconfig/[root@localhost ~]# vim 2.txt[root@localhost ~]# echo /etc/sysconfig/network | sed -f 2.txt /etc/sysconfig/[root@localhost ~]# cat 2.txt s@[^/]\{1,\}/\?$@@ [root@localhost ~]# sed 's/^#//g' /etc/fstab | sed '/^$/d'
/etc/fstab
Created by anaconda on Wed Apr 19 00:39:18 2017
Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]# sed -f 2.txt /etc/fstab
/etc/fstab
Created by anaconda on Wed Apr 19 00:39:18 2017
Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
[root@localhost ~]# cat 2.txt
s/^#//g
/^$/d
结果：
-e ：指定多个编辑命令.
[root@localhost ~]# sed -e 's/^#//g' -e '/^$/d' /etc/fstab
/etc/fstab
Created by anaconda on Wed Apr 19 00:39:18 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
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=1f522592-b116-4599-b4b8-2e292acc984a /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap 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