Common grep options and commands

-E matches according to Extended specification

-- color tag matching color

-I ignore case matching

[fbl@www test6_26] $echo "hello" | grep-I-- color 'HELLO'hello

-Q quiet match means no output

[fbl@www test6_26] $echo "hello" | grep-Q-- color 'hello' [fbl@www test6_26] $echo $? 0

-o output only the parts that match

[fbl@www test6_26] $echo "hello" | grep-E-o-- color 'hell*'hell

-w displays only the lie that matches the whole word

[fbl@www test6_26] $cat file1hellohelloohell [fbl@www test6_26] $cat file1 | grep-E-- color 'hell'hellohelloohell [fbl@www test6_26] $cat file1 | grep-wE-- color' hell'hell

[fbl@www test6_26] $cat file

Apple

Bahyude

Nue

111123

88888

Hello

Change

Brance

6666

[fbl@www test6_26] $cat file | grep-E-- color'^ [a Murz] {1,} [a Murz] $'applebahyudenuehellochangebrance

-c the number of columns to which the output matches

[fbl@www test6_26] $cat file | grep-cE-- color'^ [a Murz] {1,} [a Murz] $'6

-n displays the matching column and column number

[fbl@www test6_26] $cat file | grep-nE-- color'^ [a Murz] {1,} [a Murz] $'1:apple2:bahyude3:nue6:hello7:change8:brance

-v displays mismatched columns

[fbl@www test6_26] $cat file | grep-vE-- color'^ [a Murz] {1,} [a Murz] $'111123888886666

-an offset matching

[fbl@www test6_26] $cat file | grep-a2-- color 'hello'11112388888hellochangebrance