Bash is a simple programming language typically used by system administrators to automate tasks.
Try creating a new file with this command:
Type the following into your file:
echo "Hello World!"
Then, save and exit.
Execute your new bash script with:
With a Bash program (aka script) anything you type on the command line can be placed into the script. For example, try creating a bash script with the following contents:
#!/bin/bash cd /etc echo "Here is a listing of the /etc/ directory" ls
In addition, bash can also request input from the user and assign the answer to a variable:
#!/bin/bash # Any line that starts with a # is a comment and is not executed # These lines are used to explain what the code is doing # The read command assigns the answer to the prompt to the variable $REPLY read -p "What is your favorite color?" # The answer is now in the variable $REPLY. Let's copy that to a new variable color="$REPLY" # Now we can ask a new question read -p "What is your favorite food?" # And again we copy the answer to a new variable food="$REPLY" # -z checks if the user left the variable empty (e.g. the user just hit enter without # typing anything) if [ -z "$color" ]; then echo "You didn't provide a color." exit fi if [ -z "$food" ]; then echo "You didn't provide a food." exit fi # the || symbol means "or" if [ "$color" = "green" ] || [ "$color" = "pink" ]; then echo "I like those colors too." else echo "You like ugly colors" fi # The && symbol means "and" if [ "$color" = "green" ] && [ "$food" = "ice cream" ]; then echo "Right on!" fi