In the next couple lessons here at Nocturnal Slacker v1.0 we’ll be discussing the Bourne Again Shell (BASH) in a bit more detail.
With that in mind, though, how ’bout we play around with a neat trick that will customize your BASH prompt whenever you go to the command line? Sound like fun? OK, here we go…
There’s a file in your /home/<your_username> directory called .bashrc. You’ll need to use the -a (all) option when listing (ls) that directory because the preceding . means it’s a hidden file. So, let’s see how joe would do this…
joe@mysystem:~$ ls -a .bashrc
There we go. So Joe now knows that he does have a .bashrc file in his /home directory. Now, let’s say that Joe wants a cool BASH prompt like mine:
… that shows his username, his operating system, and his working directory. To do this, Joe is going to have to add a little data to his .bashrc file. He’ll edit the file using the VIM command line editor. Remember that from a previous lesson? Here goes Joe…
joe@mysystem:~$ vim .bashrc
And poof! Up comes VIM with the .bashrc file ready to be edited. It’s almost like magic, huh?
# custom prompt
PS1=”\u | archlinux\w:$ “
Joe is going to edit the .bashrc file to add the little bit in purple that you see above. What that will do is tell BASH to start up the command line with a prompt the shows Joe’s usersname (u), his distribution (ArchLinux) separated by the | (pipe) character; and his working directory (\w). After saving the file, this is what Joe’s command line prompt will look like once he starts his next BASH session:
joe | archlinux~:$
Pretty neato, huh? Remember the ~ denotes the home directory. If Joe was to change directories (cd) to say /boot/grub, then his prompt would now change too to show the new working directory.
joe | archlinux~:$ cd /boot/grub
joe | archlinux/boot/grub:$
Again, pretty neato, huh? This way, Joe will always know what directory he’s in at any given time. That will help prevent Joe from making any command line boo-boos.
That’s it, guys and gals. Pretty simple stuff. See? You’re not near as scared of that mean ol’ command line as you used to be, huh? Use your imagination when customizing your prompt. I’ve seen some pretty cool ones out there. Here’s the one my friend securitybreach and fellow Admin from Scot’s Newsletter Forums – Bruno’s All Things Linux uses:
╔═ comhack@Cerberus 02:27 PM
Have a great weekend wherever you may be!