Difference between revisions of "OPS235 Scripting Exercises"
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Revision as of 11:58, 10 January 2020
Contents
Things you need to know
Terminal vs script file
A shell script is nothing more than a sequence of shell commands. Any command you put in a shell script can be executed just as well in a terminal. In fact no matter how complex your script is - you can run the entire thing from a terminal window without executing the script.
Runnning a command
- How to run a command in the current directory or another directory or a directory in the $PATH
- That programs you run need to have execute permission
- What your $PWD is, pwd command
- Check the return code from a command by examining $?
Variables
- How to create a variable and set a value in it
- How to get the value from a variable
Quotes
- Why use single or double quotes
- The difference between single and double quotes
- Backquotes
Redirecting output
- How to redirect output from a command to a file
- How to pipe output from one command to another command
