Linux File Processing commands touch cat tac more less head tail and tactail

Linux File Processing commands touch cat tac more less head tail and tactail

Touch

Command name: touch

Path:/bin/touch

Execution permission: All Users

Function Description: creates an empty file.

Syntax: touch [file name]

Touch test.txt

Touch/root/test.txt? ? Create the test.txt file under the rootdirectory

Touch test test1 test2 create multiple files

Touch "program file" creates a file with spaces

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Cat?

Command name: cat

Path:/bin/cat

Execution permission: All Users

Function Description: displays the file content.

Syntax: cat [-n]? [Test1.txt]? ? ??

? ? ? ? ? ? ? ? ? ? ? -N: display the row number

Cat/etc/issue? Show System Version

Cat-n/etc/issue

 

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Tac

Command name: tac

Path:/usr/bin/tac

Execution permission: All Users

Function Description: displays the file content? Opposite to cat? Reverse display

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More

Command name: more

Path:/bin/more

Execution permission: All Users

Function Description: displays the file content by page.

Syntax: more [file name]

? ? ? ? ? ? ? ? (Space) or f? ? Flip

? ? ? ? ? ? ? ? ? (Enter )? ? Line feed

? ? ? ? ? ? ? ? ? ? Q or Q? ? ? ? ? Launch

More/etc/services

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Less

Command name: less

Path:/usr/bin/less

Execution permission: All Users

Syntax: less [file name]

Function Description: displays the file content by PAGE (pages can be turned up). You can use/[search content] to search for the next file by n.

Example: less/etc/services,

? ? ? ? ? ? The operation is the same as that of more. For less operations, you can flip pages by PAGE pageup, or click the up arrow to flip pages online by line.

? ? ? ? ? ? Available? /[Search content], press n to continue searching

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Head

Command name: head

Path:/usr/bin/head

Execution permission: All Users

Function Description: displays the first few lines of a file.

Example: head-n 20/etc/services? (Display the first 20 rows of/etc/services)

? ? ? ? ? ? Head/etc/services? ? The first 10 rows are displayed by default.

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Tail?

Command name: tail

Path:/usr/bin/tail

Execution permission: All Users

Function Description: displays the following lines of a file.

Syntax: tail [file name]

? ? ? ? ? ? -N: number of specified rows

? ? ? ? ? ? ? -F dynamically displays the content at the end of the file

Example: tail-n 18/etc/services (18 rows at the end)

? ? ? ? ? ? Tail-f/var/log/messages? Dynamic Display of 10 lines at the end

? ? ? ? ? ? Tailf/etc/services dynamically displays the last 10 lines

? ? ? ? ? ? ??