The Three Musketeers of Linux

grep

grep "Oldboy" test.txt filter out Oldboy strings in the file

-V Excludes selected characters

awk

awk '/oldboy/' test.txt '//' filter out selected characters

‘!/ /‘ ! The characters in awk that are selected for the inverse exclusion

awk ' nr==20 '/oldboy/ett.txt ' nr==20 ' Take the line ' nr==20,nr==30 ' out of 20-30 rows

sed

sed ' /oldboy/d ' test.txt '//d ' excludes selected characters d means delete-I takes effect delete selection

sed-n ' 20p '/oldboy/ett.txt-n ' 20p ' fetch line

-N ' 20p,30p ' take 20 to 30 rows

sed ' s#oldboy#oldgirl#g '/oldboy/t.sh ' s# who to find # replace why #g ' replace file contents

Sed-i ' s#oldboy#oldgirl#g '/oldboy/t.sh-i effective Replace content = Modify File contents

The Three Musketeers of Linux