Linux Notes--text

Uniq

-I.	Ignore case
-C	To Count
-fn	First N areas are ignored

Wc

Number of characters in a row

-L	List only Travel
-W	Only how many words are listed
-M	How many characters

Cut

-D	followed by the split character, used with-f
-F	Use-F to go to the first few paragraphs
-C	Remove a fixed character range in units of characters

Echo $PATH

/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:

echo $PATH | Cut-d ': '-f2

/usr/bin

echo $PATH | Cut-d ': '-f2,5

/usr/bin:/usr/sbin

echo $PATH | Cut-d ': '-f2-5

/usr/bin:/bin:/usr/local/sbin:/usr/sbin

echo $pATH | Cut-c1-4

/usr/lo

Sort

-F	Ignore Case differences
-B	Ignore the first whitespace part
-M	Sort by the name of the month.
-N	Use a pure number
-R	Reverse Sort
-U	Uniq, the same data, only one row is represented
-T	Delimiter, which is tab by default
-K	Sort by that interval (field) (with-t collocation)
-C	Whether the test files have been categorized
-M	Merge 2 classification files
-U	Delete all replicated rows
-O	The file name of the store

For-K, it can also be-k1-k2, which means to sort the second paragraph first, if the same is the second paragraph
Tr

-D	Delete character
-S	Remove duplicate characters

Cat A.txt | Tr-d ' \ r ' > B.txt

Modify the line break of a DOS file ^m

echo "Hello World" | tr [A-z] [a-z]

HELLO World

echo "Hello World" | Tr-d o

Hell Wrld

echo "Hello World" | TR o A

Hella Warld

echo "Helllllo World" | Tr-s L

Helo World

Tee Dual Guide

-A	Adding data to file in a class-plus way

Col

-X	Convert tab to peer space key
-B	When there is a backslash/in the text, only the last character of the backslash is preserved

Cat-a FILE will appear with many I symbols (tab), you can use the Convert to space function
Join

2 files, the same row that has the same data, is added together.

-T	Join by default separates data with spaces, and is more than the data for [first field]
-I.	Ignore Case differences
-O	Join-o 1.1 2.2 FILE1 FILE2, take only 1 2
-j	Join-j1 3-j2 2 FILE1 FILE2, take 3 and 2 parts
-1	Indicates that the first file is to be analyzed with that field.
-2	Indicates that the second file is to be analyzed with that field.

Cat A

111 2222

Cat B

22222 2222

Cat C

111 3333

Join a B

No results

Join-1 2 A-2 2 b

2222 111 3333

Join-1 2 B-2 2 b

2222 3333 111 If the second field of the first file is the same as the second field of the second file, join

Join-1 1 a-2 1 c

111 2222 3333

Join-t ': '/etc/passwd/etc/shadow

Integrate 2 files in the first field into one line

Join-t ': '-1 4/etc/passwd-2 3/etc/group

The fourth field of the first file is compared to the third field in the second file, and the same is combined into a single line. Before using join, the archive should be sorted, or some of the alignment items will be ignored.

Paste

-D	followed by the separator character, the default is [tab]
-S	Turn a file into a row

Paste/etc/passwd/etc/shadowcat/etc/group | Paste/etc/passwd/etc/shadow-| Head-n 3

Split

-B	The file size to be divided into, can be added in unit B K m
-L	Split by number of rows

PREFIX represents the preamble meaning and can be used as the leading text for the split file.

Split-b 300k/etc/termcap termcap

ll A.txt

-rw-rw-r--1 Xiang Xiang 3.7K Apr 15:45 a.txt

split-b 2k a.txt a.txt && ls

A.txt  a.txtaa  a.txtab

split-b 2k A.txt a && ll

Total 40k-rw-rw-r--   1 Xiang Xiang 2.0K Apr 15:45 aaa-rw-rw-r--   1 Xiang Xiang 1.7K Apr 15:45 aab

Xargs

-0	If the input stdin has special characters, such as ', \, SPACEBAR, and so on, restore him to a general character
-E	EOF can be followed by a string, and when Xargs parses the string, it stops working!
-P	When executing the argument of each instruction, the user will be asked;
-N	The number of subsequent times, each command instruction executes, uses several parameters.

Find-exec COMMAND {} \;

The action is to execute the previous found as a parameter, and the Xargs will break them down

Find-type F | Xargs file

To view the properties of a file

ls | Xargs Cat | grep "Cmov"

By listing all the files, then cat finds it again with grep.

Expand

-T can be followed by a number, the tab is converted to a space grep ' ^manpath '/etc/man* | Head-n3 | Cat-agrep ' ^manpath '/etc/man* | Head-n 3 | Expand-t 6 | Cat-a

After expand, I was not there because it was converted into a space.

Unexpand Convert a space into tab

grep ' ^manpath '/etc/man_db.conf | Head-n 3| Expand-t 12| Unexpand-t 1 | Cat-a

Linux Notes--text