Linux shell--is expression

Regular

Grep

Match, and can display the color

filter, display line numbers, case sensitive

GREP-V Reverse

Take 2 lines, next 2 lines, two rows above and below

Lines that begin with #

Do not print the beginning of the #, for example, when looking at the configuration file can be used

Match all

Once o or more, * is 0 times O or more

？ Number of repetitions 0 or 1

| Or

Case insensitive

. Any one character

* 0 or more * preceding characters

. * Pass With

{} indicates the preceding character of the range

+ one or more of the preceding characters

？ 0 or 1 preceding characters

| Or

Sed

Match and replace

-N do not print unrelated lines

R No translation

Match 2~5 Line

Print 25~ last line

Print all

Match multiple, line, and keyword

Linux shell--is expression