Scripting The GNU or Linux Shell Assignment Help
Introduction:
It is a type of programming languages. The shell script is mostly use by Linux programmer due to some good features for programming languages such as:
1. Due to smooth and simple interface which have hundreds of Unix utilities.
2. Due to automatic increase of wildcards into a list of file names.
3. Variables can automatically spilt into their constituent parts.
Any shell script is made-up of file which have one or more commands which you have to write on command line. Here I am going to show you some command which is frequently uses in scripting
Basic Commands are:
- $HOME:-For home directory.
- $PWD:- for working in current directory.
- $mkdir: for making new directory.
- $cp: copy the file in directory.
- $mv: move files.
- $touch: Change file timestamp.
- $useradd: Add a new user or update default new user updates.
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How to Give a name of script:
Going to make a new file name sample, command is:
$ type sample
Sample is a shell builtin
$ type –a sample
Sample is a shell builtin
Sample is /usr/bin/sample
Command for selecting a directory for the script:
/bin: /usr/bin:/usr/local/bin: /usr/games
You have to give a path name for your program if your program is not in one of the PATH directories. Such as /home/ username/bin/hw or as bin/hw.
- To create directory bin use the command :
mkdir bin - And add it into the PATH variable:
PATH=$PATH:$HOME/bin
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