Linux-xargs command

Overview

The Xargs command is a filter that passes parameters to other commands, and is also a tool for combining multiple commands.

It specializes in translating standard input data into command-line arguments, Xargs can process pipelines or stdin and convert them into command parameters for specific commands.

Xargs can also convert single-line or multiline text input to other formats, such as multiline variable-order lines and single-row multiple rows.

the default command for Xargs is Echo, and the space is the default delimiter .

This means that the input passed to Xargs through the pipeline will contain line breaks and whitespace, but with xargs processing, line breaks and whitespace will be replaced by spaces.

Xargs is one of the important components of building single-line commands.

Grammar

[Email protected] ~]#Xargs--Helpusage:Xargs[ -0prtx] [--interactive] [--NULL] [-d|--delimiter=Delim] [-e Eof-str] [-e[eof-str]] [--eof[=eof-STR]] [-L max-lines] [-l[max-lines]] [--max-lines[=max-Lines]] [-I replace-str] [-i[replace-str]] [--replace[=replace-STR]] [-N Max-args] [--max-args=max-args] [-S max-chars] [--max-chars=max-chars] [-P Max-procs] [--max-procs=max-procs] [--show-Limits] [--verbose] [--exit] [--no-run-if-empty] [--arg-file=file]       [--version] [--help] [command [initial-arguments]] Report Bugs to<[email Protected]>.

Chestnuts

The Xargs is used as a replacement tool to read the output of the input data after reformatting.

Define a test file with multiple lines of text data:

Cat Xargs  w x y z

Multiline input single-line output

Cat Xargs  wcatxargs. txt | Xargs  w x y z

-N option multi-line output

Cat Xargs xargs -W

The-D option allows you to customize a delimiter:

Echo " Namexnamexnamexname " xargs -dxname name name Name

Combined with the-n option

Echo " Namexnamexnamexname " xargs -dx-n2name namename name

Read stdin, pass formatted parameters to command

Suppose a command is xgj.sh and a file that holds parameters Args.txt:

Args.txt already has Execute permissions

Cat Xgj. SH #!/bin/bash# Print all the parameters echo $*cat  args.txt AAABBBCCC

One of the options for Xargs- I.,

Use-I to specify a replacement string {},

This string is replaced when the Xargs is extended, and when-I is used in conjunction with Xargs, each parameter command is executed once:

Cat Xargs -i {}./xgj. SH XXX {} yyyxxx AAA yyyxxx BBB yyyxxx CCC YYY

Copy all picture files to the/data/images directory:

ls Xargs CP

Xargs combined with Find use

When you delete too many files with RM, you may get an error message:

/bin/rmlong.

Use Xargs to avoid this problem:

Find " *.log " Xargs -0RM

The xargs-0 is used as a delimiter.

Count the number of rows for all the py files in a source code directory:

Find " *.py " Xargs -0WC

Find all the JPG files and compress them:

Find " *.jpg " Xargs tar -czvf images. Tar

Xargs Other applications

If you have a file that contains many URLs that you would like to download, you can download all the links using Xargs:

Cat Xargs wget

Linux-xargs Command