The Three Musketeers of Linux

The Three Musketeers of Linux

Awk (the boss of the Three Musketeers) awk/oldboy/test.txt

Filter file command to filter the content file name

Sed (the third swordsman's Dick) Sed-n/oldboy/p test.txt

Filter file-n Cancel default output (parameter) filter file name p for print (display)

grep (Three musketeers of Old three) grep Oldboy test.txt

Main filter command filter content file name

PS: When filtering files, awk and sed need to double slash on both sides of the filter content, grep does not need

# # #实例:

[email protected] data]# cat 2.txt

Abc

Def

Ghi

Jkl

123

Use awk to filter out the "ABC" output in the 2.txt file to redirect to the 1.txt file:

[email protected] data]# Cat | Awk/abc/2.txt > 1.txt

[email protected] data]# cat 1.txt

Abc

Use SED to filter out the "ghi" append output in the 2.txt file to redirect to the 1.txt file:

[email protected] data]# Cat | Sed-n/def/p 2.txt >> 1.txt

[email protected] data]# cat 1.txt

Abc

Def

Use grep to filter out the "def" append output in the 2.txt file to redirect to the 1.txt file:

[email protected] data]# Cat | grep "Ghi" 2.txt >> 1.txt

[email protected] data]# cat 1.txt

Abc

Def

Ghi

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The Three Musketeers of Linux