For example, if we have shell script named "myshellscript.sh" (with execute permission) we can make it run in the current working directory with the commands $ sh myshellscript.sh (or) $ ./myshellscript.sh If the shell scripts are stored in an executable path, it will save us from typing extra keystrokes. To find the paths that are setup, type $ echo $PATH /usr/bin: /usr/local/bin (more…)

Shell scripts are written to execute a set of commands and to group them. The scripts will have the following special line #!/bin/bash This is an indication that the shell script is used in bash shell and that it should be called for command execution. To know the path of the bash shell, type $ cat /etc/shells (more…)

Shell is an environment around the Kernel providing user interaction. It accepts user commands and convert them to binary code. It is not part of the kernel but uses the kernel to execute the commands. Commonly available shells - BASH (Bourne Again Shell) - CSH (C Shell) - KSH (Korn Shell) All these shells do the same job and the differences come in the form of syntax that these shells use to execute commands and the built-in functions that comes along with it. You can find the shell that is in execution by typing $ echo $SHELL To find all the available shells in the system, type $ cat /etc/shells