I have just started learning the fundamentals of Unix and wondering why there are so many shells in a unix like system .
Before we get ahead of ourselves, it would probably be a good idea to go over some BASH basics.Let's start at the beginning, OK? The Bourne Shell was born at AT&T's Bell Laboratories a while back. It was birthed by Steve Bourne, hence the name. The Bourne Again Shell (bash) is a direct descendent of the Bourne Shell (sh). It's very similar to the critter that Mr.
How can I find out whether a script is written in bash or sh?
The first line of the script is not helpful here, since on Linux, bash scripts have this line:
#!bin/sh
Actually, there are many distribution where bin/sh is bash (maybe bin/sh is a link to bin/bash in those distributions), and not Bourne Shell.
From the book Advanced Programming in the Unix environment:
Linux uses the Bourne-again shell for its default shell.
So in UNIX, I understand that there are several different shells you can be in: C, Bourne, Bourne Again, Korn, etc. I also know that you can write scripts for the shells, by assigning it by #!/bin/csh, or sh, etc.
If I am working in the csh, do I have to write the script for the csh? Or can it be sh?
The command line is a powerful way to interact with a Linux computer. Instead of using the mouse, you just type commands into the shell. (The shell is a blank window where you type in your commands.) So for example, instead of clicking on your file browser, you simply type ls [enter] to display the contents of your working directory.
My /etc/profile code is:
# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).
if [ "$PS1" ]; then
if [ "$BASH" ] && [ "$BASH" != "/bin/sh" ]; then
# The file bash.bashrc already sets the default PS1.
# PS1='\h:\w\$ '
if [ -f /etc/bash.bashrc ]; then
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Hey everybody, I've been searching google and these forums and have found some solutions to the issues I've been having today within the Bourne Shell.
Hey everybody, I've been searching google and these forums and have found some solutions to the issues I've been having today within the OLD Bourne Shell.
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