Go on Shell

Shell Bash is the most commonly used script in Linux. You can write Common commands such as grep sed awk.

When grep is used, we need to think of regular expressions.

 

The row starting with a lowercase letter is listed.
Grep-n '^ [A-Z]'
OO cannot start with lowercase letters
Grep-n '[^ A-Z] oo'
Do not want to start with an English letter
Grep-n' ^ [^ A-Za-Z]'
The row whose end ends with the decimal point (.)
Grep-n' \. $ '!. For conversion
Which line is blank 』
Grep-n '^ $'
As long as there is a G
Grep-N 'G * G'
Start with G and end with G
Grep-N 'G. * G'

Egrep-V '^ $ | ^ #' removes the blank line and the first line

 

Sed '2, 5d 'del 2 to 5 row

Sed '2a XXX' insert XXX after 2 row

Sed '2, 5C XXX' replace 2-5 rows with xxx

Sed-n'5, 7p' only lists 5 to 7 rows

Sed '/string to be replaced/New String/G'

Sed-I op directly operates on the file