Explain different types of variables in shell?
Environment Variables: Sometimes called special shell variables, keyword variables, predefined shell variables, or standard shell variables, they are used to tailor the operating environment to suit your needs. Examples include PATH, TERM, HOME, and MAIL.User-defined Variables: These are variables that you create yourself.Positional Parameters: These are used by the shell to store the values of command-line arguments
- Open the terminal. Go to the directory where you want to create your script.
- Create a file with . sh extension.
- Write the script in the file using an editor.
- Make the script executable with command chmod +x <fileName>.
- Run the script using ./<fileName>.
- Create a file using a vi editor(or any other editor). Name script file with extension . sh.
- Start the script with #! /bin/sh.
- Write some code.
- Save the script file as filename.sh.
- For executing the script type bash filename.sh.
- Open Command Prompt and navigate to the folder where the script file is available.
- Type Bash script-filename.sh and hit the enter key.
- It will execute the script, and depending on the file, you should see an output.
- First, find out the available shells on your Linux box, run cat /etc/shells.
- Type chsh and press Enter key.
- You need to enter the new shell full path. For example, /bin/ksh.
- Log in and log out to verify that your shell changed corretly on Linux operating systems.
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