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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

By : Sinny Kumari
4.5 (2)
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Linux Shell Scripting Essentials

Linux Shell Scripting Essentials

4.5 (2)
By: Sinny Kumari

Overview of this book

Shell scripting is a quick method to prototype complex applications or problems. Shell scripts are a collection of commands to automate tasks, usually those for which the user has a repeated need, when working on Linux-based systems. Using simple commands or a combination of them in a shell can solve complex problems easily. This book starts with the basics, including essential commands that can be executed on Linux systems to perform tasks within a few nanoseconds. You’ll learn to use outputs from commands and transform them to show the data you require. Discover how to write shell scripts easily, execute script files, debug, and handle errors. Next, you’ll explore environment variables in shell programming and learn how to customize them and add a new environment. Finally, the book walks you through processes and how these interact with your shell scripts, along with how to use scripts to automate tasks and how to embed other languages and execute them.
Table of Contents (10 chapters)
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9
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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