You need to use "YUI Compressor" tool. It is widely used for minifying JavaScripts and stylesheets. From the project page:
Tutorial details
Difficulty Easy (rss)
Root privileges Yes
Requirements None
Estimated completion time 5m

The YUI Compressor is JavaScript minifier designed to be 100% safe and yield a higher compression ratio than most other tools. Tests on the YUI Library have shown savings of over 20% compared to JSMin (becoming 10% after HTTP compression). The YUI Compressor is also able to compress CSS files by using a port of Isaac Schlueter's regular-expression-based CSS minifier.
Step #1: Install JAVA on Linux or Unix

You need JAVA to run yuicompressor. See how to install JAVA on Linux:

  • Install JAVA SDK on a CentOS/RHEL based system
  • Instal latest JAVA SDK on a Debian/Ubuntu based system

Once Java installed on the system, make sure you can see the JDK info with the following command:


whereis java
which java
java -versio
Sample outputs:

Fig. 01: Make sure java is installed on a Linux/Unix based system


Also, make sure you set correct path to JAVA_HOME in your shell startup file. For example:
export JAVA_HOME="/usr/lib/jvm/jre-1.7.0-openjdk.x86_64"
Step #2: Install yuicompressor on a Linux and Unix-like system

Type the following wget command to download the latest version of yuicompressor:
$ mkdir -p $HOME/yuicompressor
$ cd !!:$
$ wget https://github.com/yui/yuicompressor...ssor-2.4.8.jar
How do I run yuicompressor?

Type the following command to run the yuicompressor directly:
$ java -jar yuicompressor-2.4.8.jar
Sample outputs:

YUICompressor Version: 2.4.8

Usage: java -jar yuicompressor-2.4.8.jar [options] [input file]

Global Options
-V, --version Print version information
-h, --help Displays this information
--type <js|css> Specifies the type of the input file
--charset <charset> Read the input file using <charset>
--line-break <column> Insert a line break after the specified column number
-v, --verbose Display informational messages and warnings
-o <file> Place the output into <file>. Defaults to stdout.
Multiple files can be processed using the following syntax:
java -jar yuicompressor.jar -o '.css$:-min.css' *.css
java -jar yuicompressor.jar -o '.js$:-min.js' *.js

JavaScript Options
--nomunge Minify only, do not obfuscate
--preserve-semi Preserve all semicolons
--disable-optimizations Disable all micro optimizations

If no input file is specified, it defaults to stdin. In this case, the 'type'
option is required. Otherwise, the 'type' option is required only if the input
file extension is neither 'js' nor 'css'.
Expand
Example: Compress and Minify a CSS file

In this example, I am going to to compress style.css code file to reduce file size and make site load faster. My current file size:
$ ls -l style.css
Sample outputs:

-rw-r--r--. 1 vivek vivek 46909 Jan 11 21:33 style.css
Next, call the yuicompressor directly with a command:
$ java -jar yuicompressor-2.4.8.jar --type css style.css > mini_style.css
OR
$ java -jar yuicompressor-2.4.8.jar --type css -o mini_style.css style.css
Again, list minified/compressed css file and note down the file size with the help of ls command:
$ ls -l style.css
Sample outputs:

-rw-r--r--. 1 vivek vivek 36576 Jan 11 21:33 mini_style.css
Here is a bash for loop to compress multiple CSS files:


for i in ie.css style.css tutorial.css social.css
do
java -jar yuicompressor-2.4.8.jar --type css -o "mini_$i" "$i"
done
Example: Compress and Minify a Javascript file

The syntax is:
$ java -jar yuicompressor-2.4.8.jar --type js nixcraft.js > mini_nixcraft.js
OR
$ java -jar yuicompressor-2.4.8.jar --type js -o mini_nixcraft.js nixcraft.js
Here is a bash for loop to compress js files:


for i in nixcraft.js ads.js demo.js ui.js
do
java -jar yuicompressor-2.4.8.jar --type js -o "mini_$i" "$i"
done
GarryField Reviewed by GarryField on . Minify and Compress CSS & Javascript Files At a Linux/Unix Shell Prompt http://www.besthostingforums.com/images/cdn/besthostingforums.com/2014/04/terminal-1.png You need to use "YUI Compressor" tool. It is widely used for minifying JavaScripts and stylesheets. From the project page: Tutorial details Difficulty Rating: 5