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This article is about how to use the cat command in linux. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Note: after the awk command, there are not many complex commands, all basic commands.

Description:

Cat, the abbreviation of the word concatenate, outputs the contents of the file to stdout. When associated with the redirection operator (> or

When used in combination, it is generally used to connect multiple files.

Usage:

1. $cat file1 file2 file3

two。 It can be read not only from the file and spliced, but also from the standard input stream.

For example: $echo 'some content' | cat-file.txt

Explanation: here-represents the temporary file of 'some content', that is, the input stream

Example:

1. $cat cat.txt

Printed all the contents of cat.txt

2.$cat cat.txt | less

Check cat.txt, one page and one screen after joining less, which will be described in the less,more command later.

3.$cat-n cat.txt

Mark the line number before each line, including blank lines

4.$cat-b cat.txt

Mark the line number before a non-blank line

Interpretation-- help

Usage: cat [option]. [file].

Output [file] or standard input combination to standard output.

-A,-- show-all equals-vET

-b,-- number-nonblank to the non-empty outgoing line number

-e equals-vE

-E,-- show-ends displays "$" at the end of each line

-n,-- number numbers all lines of the output

-s,-- squeeze-blank does not output multiple blank lines

-t is equivalent to-vT

-T,-- show-tabs displays tabbed characters as ^ I.

-u (ignored)

-v,-- show-nonprinting uses ^ and M-references, except for LFD and TAB

-- help displays this help and exits

-- version displays version information and exits

If no file is specified, or if the file is "-", it is read from standard input.

Example:

Cat f-g outputs the content of f first, then the content of standard input, and finally the content of g.

Cat copies the contents of standard input to standard output.

Interpretation:

1. Cat-s file.txt

If there is a file that has this format:

Line1

# blank line

Line2 file2

Use this command.

Cat is more combined with other commands, and there is no complicated content of its own. If you are bored, try cat-A cat.txt and you will have unforgettable memories.

Related commands:

Cat's father-in-law is usually ordered by sed,tr.

Such as:

$cat file | sed's Compact OldUniverse G'

Display the file file and convert old to new without modifying the original file

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