21 Instances of SED

1. Delete the first character of each line of the file.
Sed ' s/.//' install.log
Sed-n ' S/^.//GP '/etc/passwd
Sed-nr ' s/(.) (. *)/\2/p '/etc/passwd2. Delete the second character of each line of the file.
Sed ' S/.//2 ' install.log
Sed ' s/(.) (.) (. *)/1\3\/' Install.log
Sed-nr ' s/(.) (.) (. *)/\1\3/p '/etc/passwd
3. Delete the last character of each line of the file.
sed ' s/.$//' install.log
Sed-nr ' s/.$//p '/etc/passwd
Sed-nr ' s/(. *) (.) /\1/p '/etc/passwd4. Delete the second-to-last character of each line of the file.
sed-r ' s/(. *) (.) (.) /\1\3/' Install.log
Sed-nr ' s/(. *) (.) (.) /\1\3/p '/etc/passwd
5. Delete the second word in each line of the file.
sed-r ' s/([a-z]+) ([^a-z]+) ([a-z]+] ([^a-z]+) (. *)/\1\2\4\5/' Install.log
Sed-nr ' s/([^a-z]*) ([a-z]+) ([^a-z]+] ([a-z]+) (. *)/\1\2\3\5/p '/etc/passwd
6. Delete the second-to-last word in each line of a file.
sed-r ' s/([a-z]+) ([^a-z]+) (. *) ([a-z]+] ([^a-z]+] ([a-z+])/\1\2\3\4\6/' Install.log
Sed-nr ' s/(. *) ([^a-z]+) ([a-z]+) ([^a-z]+] ([a-z]+) ([^a-z]*]/\1\2\4\5\6/p '/etc/samba/smb.conf
7. Delete the last word in each line of the file.
sed-r ' s/(. *) ([^a-z]+) ([a-z]+)/\1\2/'/etc/passwd
Sed-nr ' s/(. *) ([^a-z]+) ([a-z]+) ([^a-z]*]/\1\2\4/p '/etc/samba/smb.conf
8, swaps the first character and the second character of each line.
sed-r ' s/(.) (.) /\2\1/'/etc/passwd
Sed-nr ' s/(.) (.) (. *)/\2\1\3/p '/etc/passwd
9, swaps the first character and the second word of each line.
sed-r ' s/(^.) ([^a-z]*) ([a-z]+) ([^a-z]+) ([a-z]+)/\5\2\3\4\1/'/etc/passwd
Sed-nr ' s/([^a-z]*) ([a-z]+) ([^a-z]+] ([a-z]+) (. *)/\1\4\3\2\5/p '/etc/samba/smb.conf
10, swap the first word and the last word of each line.
sed-r ' s/([a-z]+) ([^a-z]+) (. *) ([^a-z]+] ([a-z]+)/\5\2\3\4\1/' Install.log
Sed-nr ' s/([^a-z]*) ([a-z]+) ([^a-z]+] ([a-z]+) (. *)/\1\4\3\2\5/p '/etc/passwd
11, delete all the numbers in a file.
sed ' s/[0-9]//g ' install.log
sed ' s/[0-9]*//g '/etc/passwd
12, remove all spaces at the beginning of each line.
sed ' s/^ *//' Install.log
Sed-n ' s/^\ *//p '/etc/samba/smb.conf
Sed-nr ' s/(*) (. *)/\2/p ' TESTP
13, replace any spaces that appear in the file with tabs.
Sed-r ' s/(+)/\t/g ' Install.log
Sed ' s//\t/g ' ww.txt
sed-n ' s/\/\t/gp ' pass
14, enclose all uppercase letters in parentheses ().
sed ' s/[a-z]/(&)/g '/etc/passwd
Sed-nr ' s/([A-z])/(&)/GP ' TESTP
sed-n ' s/[a-z]/(&)/gp ' TESTP15, print 3 times per line.
sed-n ' p;p;p '/etc/passwd
sed ' p;p ' pass
16, interlace Delete.
sed ' 1d;n;d ' ww.txt
Sed ' 1~2d ' ww.txt
Sed ' 0~2d ' ww.txt
sed-n ' 1~2p ' pass
17, copy the file from line 22nd to line 33rd to the end of line 56th.
cat-n/etc/passwd | sed ' 22h;23,33h;51g '
sed ' 1,21h;22h;23,33h;44g ' pass
18, move the file from line 22nd to line 33rd to the end of line 56th.
cat-n/etc/passwd | sed ' 22{h;d};23,33{h;d};51g '
sed ' 22{h;d};23,33{h;d};44g ' pass
19, show only the first word of each line
sed-r ' s/([a-z]+) (. *)/\1/' Install.log
Sed-nr ' s/([^a-z]*) ([a-z]+) ([^a-z]+] (. *)/\2/p '/etc/passwd
20, print the first word and the third word of each line.
sed-r ' s/([a-z]+) ([^a-z]+) ([a-z]+] (. *)/\1\3/' Install.log
Sed-r ' s/([^a-z]*) ([a-z]+] ([^a-z]+) ([a-z]+] ([^a-z]+) ([a-z]+] (. *)/\2\6/'/etc/passwd
Sed-nr ' s/([^a-z]*) ([a-z]+] ([^a-z]+) ([a-z]+] ([^a-z]+) ([a-z]+] (. *)/\2--\4/p '/etc/passwd
21, change the format of the date format mm/yy/dd to MM;YY;DD
echo mm/yy/dd | sed-n ' s#/#; #gp '
Date +%m/%y/%d |sed-n ' s#/#; #gp '
Sed-r ' [email protected]/@;@g '/etc/passwd

This article is from the "Small Zheng Technology Blog" blog, please be sure to keep this source http://ko178.blog.51cto.com/220419/1765204

21 Instances of SED