The use of the SED tool---------Linux

Sed

stream editor, line editor

how SED works

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SED basic use

format one :

sed [OPTION ...] [SCRIPT] [FILE ...] Multiple file processing: One is processed and the second is processed. SED script file1--sed script file2 use basic with vim command 1) Vim%--sed no indication 2) VIM @@ ##/--sed | | ,, @@ //

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format Two :

Sed ' address-bound command ' FILE ...

1) Address delimitation

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2) command

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Example: inserting the contents of a file into a specified file # sed '/^uuid/r/etc/issue '/etc/fstab# sed ' 1,3r/etc/centos-release '/etc/issue

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Example: Take a file base name, directory name: echo "/etc/sysconfig/useradd/" | Sed ' s,/$,, ' | Sed-r ' s| (.*/) ([^/]+) |\2| ' directory name: echo "/etc/sysconfig/useradd/" | Sed ' s,/$,, ' | Sed-r ' s| (.*/) ([^/]+) |\2| '

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Example: # echo "How is You" | Sed-r ' s/(How) (. *) [You]/\3\2\1/' # echo ' How is ' | Sed-r ' [email protected] (how) (. *) (you) @\3\2\[email protected] ' # echo ' How is ' | Sed-r ' s# (How) (. *) [You] #\3\2\1# ' # echo ' How is ' | Sed-r ' s, (How) (. *), \3\2\1, ' # echo ' How is ' | Sed-r ' s| (how) (.*) (You) |\3\2\1| '

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For example: [[email protected] bin]# head-n 1 </etc/passwd | Sed ' s,root,root, ' root:x:0:0:root:/root:/bin/bash[[email protected ' bin]# head-n 1 </etc/passwd | Sed ' s,root,root,g ' root:x:0:0:root:/root:/bin/bash

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For example: [[email protected] bin]# head-n 1 </etc/passwd | Sed ' s,root,root,i ' root:x:0:0:root:/root:/bin/bash[[email protected] bin]# head-n 1 </etc/passwd | Sed ' s,root,root,gi ' root:x:0:0:root:/root:/bin/bash

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Example: [[email protected] bin]# Cat </etc/passwd | Sed-n ' S,root,root,ip ' Root:x:0:0:root:/root:/bin/bashoperator:x:11:0:operator:/root:/sbin/nologin

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# sed ' s,,, w/path/to/somefile ' file# sed ' s,,, ' FILE >/pth/to/somefile

Exercise 1: Remove any whitespace characters from the beginning of a line beginning with whitespace in the/boot/grub/grub.conf text

Exercise 2: Remove all # and white space characters from the beginning of the line in the/etc/fstab file that begin with #, followed by at least one white space character

Practice 3:echo an absolute path to the SED command: Take out its base name, remove the directory name

Exercise 1: Remove any whitespace characters from the beginning of a line beginning with whitespace in the/boot/grub/grub.conf text

CentOS 6: # cp/boot/grub/grub.conf/tmp/grub.conf # sed-i ' s,^[[:space:]]\+,, '/tmp/grub.confcentos 7: # Cp/et C/grub2.cfg/tmp/grub2.cfg # sed-i ' s,^[[:space:]]\+,, '/tmp/grub2.cfg

Exercise 2: Remove all # and white space characters from the beginning of the line in the/etc/fstab file that begin with #, followed by at least one white space character

# cp/etc/fstab/tmp/a.file# Sed-i-R ' s|^#[[:space:]]+| | '/tmp/a.file extension: Remove the line beginning with #, followed by no white space character, # # CP/ETC/FSTAB/TMP/FST ab# echo "#hello sed" >>/tmp/fstab# sed-i-R ' [Email protected]^# ([^[:space:]].*] @\[email protected] '/etc/fstab

Practice 3:echo an absolute path to the SED command: Take out its base name, remove the directory name

The test takes out the absolute path in the file name that exists Useradd # Locate-b useradd.../usr/share/man/zh_cn/man8/useradd.8.gz/usr/share/man/zh_tw/man8/ Useradd.8.gz ... Remove/usr/share/man/zh_tw/man8/useradd.8.gz's base name # echo "/usr/share/man/zh_tw/man8/useradd.8.gz/" |  Sed ' s,/$,, ' | Sed-r ' s# (. */) ([^/]+$) #\2# ' Remove the/usr/share/man/zh_tw/man8/useradd.8.gz directory name # echo "/usr/share/man/zh_tw/man8/ Useradd.8.gz "|  Sed ' s,/$,, ' | Sed-r ' s# (. */) ([^/]+$) #\1# '

format three :

Sed ' address bound command, address bound command, address bound command, ... '

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This article is from the "Reading" blog, make sure to keep this source http://sonlich.blog.51cto.com/12825953/1964161

The use of the SED tool---------Linux