"Hello World" Program
Your first Custom Partition will contain a simple shell script that displays the message "Hello, world!" with the help of the gtkmessage
utility.
Open the local terminal on your device and log in as
root
. If the local terminal has not been configured yet, see Local Terminals.Change into the
/custom
directory:cd /custom
Make a
hello
directory for your Custom Partition contents:mkdir hello
Change into the
hello
directory:cd hello/
Open a new plaintext file using the GNU nano editor:
nano hello.sh
The colors used by default for syntax highlighting in nano may be inconvenient for reading. You can change the colors with the following command:
sed -i "s#color cyan#color blue#; s#color brightyellow#color red#" /usr/share/nano/sh.nanorc
Also, you can use the vi editor as an alternative; the commands for exiting and saving a file will be different then.
Put this content into the file:
#!/bin/bash
gtkmessage -m "Hello, World!" -t "Hello" -o "Close"Save the file by pressing [Ctrl]+[o], [Return].
Exit the GNU nano editor by pressing [Ctrl]+[x].
Make the file executable:
chmod a+x hello.sh
Run the shell script from the command line to test it:
./hello.sh
A message window like this should open:
You can close it with the Close button.