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Linux Shell Scripting Essentials

You're reading from   Linux Shell Scripting Essentials Learn shell scripting to solve complex shell-related problems and to efficiently automate your day-to-day tasks

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Product type Paperback
Published in Nov 2015
Publisher
ISBN-13 9781785284441
Length 282 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (10) Chapters Close

Preface 1. The Beginning of the Scripting Journey FREE CHAPTER 2. Getting Hands-on with I/O, Redirection Pipes, and Filters 3. Effective Script Writing 4. Modularizing and Debugging 5. Customizing the Environment 6. Working with Files 7. Welcome to the Processes 8. Scheduling Tasks and Embedding Languages in Scripts Index

Passing stdout as a parameter using xargs


The xargs command is used to build and execute a command line from a standard input. Commands such as cp, echo, rm, wc, and so on, don't take input from a standard input or redirected output from another command. In such commands, we can use xargs to provide an input as an output of another command. The syntax is as follows:

xargs [option]

Some of options are explained in the following table:

Option

Description

-a file

This reads items from a file instead of stdin

-0, --null

Inputs are null-terminated instead of whitespace

-t, --verbose

Prints a command line on a standard output before executing

--show-limits

This displays the limit on the length of the command line imposed by OS

-P max-procs

Runs upto the max-procs processes one at a time

-n max-args

This at most uses the max-args argument per command line

Basic operations with xargs

The xargs command can be used without any option. It allows you to enter an input from stdin...

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