Book Image

Linux Shell Scripting Essentials

By : Sinny Kumari, Khem Raj
Book Image

Linux Shell Scripting Essentials

By: Sinny Kumari, Khem Raj

Overview of this book

Table of Contents (15 chapters)
Linux Shell Scripting Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

pushd and popd


Both pushd and popd are shell builtin commands. The pushd command is used to save the current directory into a stack and move to a new directory. Furthermore, popd can be used to return back to the previous directory that is on top of the stack.

It is very useful when we have to switch between two directories frequently.

The syntax of using pushd is as follows:

pushd [directory]

If no directory is specified, pushd changes the directory to whatever is on the top of the stack.

The syntax of using popd is as follows:

popd

Using the popd switch, we can go back to the previous directory that is on top of the stack and pop that directory from stack.

The following example counts the number of files or directories in a specified directory until one level:

#!/bin/bash
# Filename: pushd_popd.sh
# Description: Count number of files and directories

echo "Enter a directory path"
read path

if [ -d $path ]
then
   pushd $path > /dev/null
   echo "File count in $path directory = 'ls | wc...