Getting Started with Shell programming

1.5 Cut command--split file

Cut-d:-F 3/ETC/PASSWD take 3rd paragraph

1.6 Sort Command--sort

SORT-T:-k3/etc/passwd sorted by 3rd paragraph

-N Sort by number

-R Reverse Order

-U Remove Duplicate entries

1.7 WC Command

-L Calculation of rows

-W Computed character segments

-M computed characters

1.8 Uniq and Tee

Uniq to repeat

-C calculates the number of repetitions

Sort 2.txt | Uniq-c

Tee redirects and displays

1.9 TR and split

TR Lowercase conversion Uppercase

echo "ABCD" | Tr ' b-f ' b-f '

Split cutting Large files

Split-b 50m 1.txt by size

Split-l 1.txt by number of rows

2.0 connectors (and, and, or)

&& execute the following command before execution succeeds

|| Or if the previous execution is unsuccessful, the following command will be executed

, and both front and back are executed

2.1 grep Filter

--color keyword highlighting

-N Display Line number

-C Displays the number of rows

-V takes the reverse, excluding the line of the keyword

-A 3 3 rows below the keyword line

-B 3 more than 3 rows on the keyword line

-C 3 keyword line up and down to display 3 rows

-R Find all files under a directory

Getting Started with Shell programming