The SED of the Linux op korimasa expression

One: The Linux op korimasa the sed of the expression

Sed: Stream editor, which is a unit of behavior

1. Options and Parameters:

-N: Use Quiet (silent) mode. In the usage of general sed, all data from STDIN is generally listed on the terminal. However, if you add the-n parameter, only the line (or action) that is specially processed by SED is listed.
-E: Action editing of SED directly in command-line mode;
-F: Write the action of SED directly in a file,
-I: Directly modifies the contents of the read file, not the output to the terminal.
A: New, a can be followed by a string, and these strings will appear in a new line
C: Replace, C can be followed by strings, these strings can replace the line between N1,N2!
D: Delete, because it is deleted ah, so d usually do not pick up any boom;
I: Insert, I can be followed by a string, and these strings will appear in a new line
P: Print, that is, print out a selected data.
S: Replace, can be replaced directly.

2. Example exercises:

[[Email protected] ~]# sed ' 3d ' test.txt <<<-----Delete third row

[[Email protected] ~]# sed ' 3p ' test.txt <<<-----Print Third line

[[Email protected] ~]# sed ' 1,4d ' a.txt <<<-----Delete line first to fourth
[Email protected] ~]#
[[Email protected] ~]# sed ' 1d,4d ' a.txt <<<-----Delete First and four rows

[[Email protected] ~]# sed '/sb.*$/d ' a.txt delete line ending with SB

[[Email protected] ~]# sed '/^s/c 1111 ' test.txt line with s beginning with 1111

[[Email protected] ~]# sed ' s/sb/sb/' a.txt to replace SB with SB
[[Email protected] ~]# sed ' s/sb/sb/g ' a.txt all replaced

[[email protected] ~]# sed-r '/^[0-9] ([a-z]+] xsb$/s/sb/sb/g ' a.txt

[[email protected] ~]# sed-r ' s/^ ([a-z]+] ([^a-z])/\2/g ' test.txt <<<------Delete the first word of each line
[[email protected] ~]# sed-r ' s/([^a-z]) ([a-z]+] $/\1/g ' test.txt <<<------Delete the last word per line

[[email protected] ~]# sed-r ' s/^ ([a-z]+) ([^a-z]+] ([a-z]+) ([^a-z]+]/\3\2\1\4/g ' test.txt ') first word and second word change position

[[email protected] ~]# sed-r ' s/^ (.) (. *) $/\2/' test.txt Delete the first character of each line of a file
[[email protected] ~]# sed-r ' s/^ (.) (.) (. *) $/\1\3/' test.txt Delete the second character of each line of a file
[[email protected] ~]# sed-r ' s/([^a-z]+) ([a-z]+] ([^a-z]) ([a-z]+]/\1\3\4/g ' test.txt
Delete the second-lowest word

[[email protected] ~]# Sed-ri ' s///g ' <<--+i change to file inside
Do not add I before the general write, see the output results are determined and then add I to save the changes.

The SED of the Linux op korimasa expression