Linux Text Processing Command notes summary

Directory Management:

LS, CD, pwd, mkdir, Rmdir/tree

File Management

Touch, stat, file, RM, MV, Nano

Date Time:

Date, clock, Hwclock, CA

To view text:

Cat, TAC, more, less, less, head, tail

Cat: Connect and display

-N

-E

Split screen display:

MORE: Flip Forward

Less

Head: View Top N rows

Tail: View after n rows

n Default is 10 rows

Tail-f: Look at the end of the file, do not exit, wait for the new content appended to this file to appear:

Text Processing:

Cut, join, SED, awk

Database: Databases

Relational database:

Table: two-dimensional tables (rows, columns)

Cut

-D: Specifies the field delimiter, which is the default space

-F: Specify the fields to display

-F 1,3 display specifies the first and third

-F 1-3 Display specifies the first, second, and third fields

Text sort: Sort (affects the order of display only, does not change the contents of the file, by default the ASCII size of the characters from left to right, from small to large sort)

-N numeric sorting by numeric size

-R Reverse Reverse order

-T Field delimiter

-k specifies which field to sort by keyword eg:sort-t:-k3/etc/passwd

-U sorts the same rows once, only once

-F Sort ignores character case

Uniq:report or omit repeated lines

Note: In the same file, only rows with identical contiguous content are considered repeated lines

-C Displays a repeating count of a row

-D displays only duplicate rows

Text statistics: Wc:word count

-L Number of rows

-W Character Count

-C byte

The longest line of-l, how many characters are there

Character processing commands: TR--Convert or delete characters

TR [OPTION] ... SET1 [SET2]

-D Delete all characters that appear in the character set

TR AB-AB

Tr ' A-Z ' A-Z ' </etc/passwd

Text Processing Cat,more,less,head,tail,cut,sort,uniq,grep

Pipelines and redirects: > < >> <<

Users, Groups, permissions

Bash and its features

How do I get the latest kernel version number for Linux?

www.kernel.org

List the Linux distributions you know more about, and explain their shutdown with the Linux kernel.

Linux, Gnu/linux, source code

Release: Fedora, RedHat (Centos), Suse,debian (Ubuntu,mint), Gentoo, LFS (Linux from Scratch)

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Linux Text Processing Command notes summary