Linux Basic article 07,linux text processing cat more less head tail sort uniq grep cut jion sed awk

Text processing cat more less head tail sort uniq grep cut jion sed awk

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cat:concatenate files and print on the standard output display the contents of the file to the normal outputs (display)

-E: Displays the last character at the end

-N: Show line numbering

[Email protected] ~]# cat-n/etc/shells

1/bin/sh

2/bin/bash

3/sbin/nologin

4/bin/dash

5/bin/tcsh

6/bin/csh

[Email protected] ~]# cat-e/etc/shells

/bin/sh$

/bin/bash$

/sbin/nologin$

/bin/dash$

/bin/tcsh$

/bin/csh$

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More less: multi-screen display

Head: Show the first few lines

Tail: Show the end of a few lines

Head: Show the first few lines

Tail: Show the following lines

-F: Append display, this command is more important

[Email protected] ~]# head-2/etc/shells

/bin/sh

/bin/bash

[Email protected] ~]# Tail-2/etc/shells

/bin/tcsh

/bin/csh

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Sort: Sorting Ascending

-N: Sort by number

-R: Descending

-T: Field separator

-K: The same after sorting is displayed only once

-F: Sort ignoring character case

[Email protected]/]# Cat/tmp/t1.txt

1

11

2

3

4

5

6

21st

324

Default ASCII sort

[Email protected]/]# Sort/tmp/t1.txt

1

11

2

21st

3

324

4

5

6

ASCII Descending

[Email protected]/]# sort-r/tmp/t1.txt

6

5

4

324

3

21st

2

11

1

Number Descending

[Email protected]/]# Sort-nr/tmp/t1.txt

324

21st

11

6

5

4

3

2

1

Number Ascending

[Email protected]/]# sort-n/tmp/t1.txt

1

2

3

4

5

6

11

21st

324

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Uniq: (omitted) reports adjacent duplicate rows

-C: Shows the number of rows in a file that repeats

-D: Show only duplicate rows

[Email protected]/]# Cat/tmp/t1.txt

1

2

3

1

2

2

45

45

[Email protected]/]# Uniq/tmp/t1.txt

1

2

3

1

2

45

[Email protected]/]# uniq-c/tmp/t1.txt

1 1

1 2

1 3

1 1

2 2

2 45

[Email protected]/]# uniq-d/tmp/t1.txt

2

45

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Wc:word number of line words in count statistics file bytes

-L: Line

-M: Words

-C: bytes

[Email protected]/]# Wc/tmp/t1.txt

8 8 18/tmp/t1.txt

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Character processing commands

TR: Character conversion or deletion character

-D: Remove all characters that appear in the character set

[[Email protected]/]# TR ' AB ' AB '

Ab

Ab

Abc

Abc

Abc

Abc

[[email protected]/]# tr-d ' AB '

Abcd

Cd

Adbc

dc

Aabb

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Cut:remove sections from the all line of files display file specified field

Cut: Show file specified field

-D: Specify field separator, default space

-F: Specify the fields to display

-F 1,3-f 1-3

[Email protected]/]# cut-d:-f1/etc/passwd | Tail-1

Jameszhan

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grep Follow-up explanation

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Jion less Use Skip

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Sed follow-up explanation

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awk Follow-up explanation

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Linux Basic article 07,linux text processing cat more less head tail sort uniq grep cut jion sed awk