The $0 variable represents the script name, and this is often used in usage statements. As we are not yet looking at conditional statements, we will get the script name printed above the displayed name.
Edit your script so that it reads like the following complete code block for $HOME/bin/hello2.sh:
#!/bin/bash echo "You are using $0" echo "Hello $*" exit 0
The output from the command is shown in the following screenshot:
If we prefer not to print the path and only want the name of the script to show, we can use the basename command, which extracts the name from the path. Adjust the script so that the second line now reads as follows:
echo "You are using $(basename $0)"
The $(....) syntax is used to evaluate the output of the inner command. We first run basename $0 and feed the result into an unnamed variable represented by the $.
The new output will appear as seen in the following screenshot:
It is possible to achieve the same results using back quotes; this is less easy to read, but we have mentioned this as you might need to understand and modify the scripts that have been written by others. The alternative to the $(....) syntax is shown in the following example:
echo "You are using 'basename $0'"
Please note that the characters used are back quotes and NOT single quotes. On UK and US keyboards, these are found in the top-left corner next to the number 1 key.