alias

xviddivxoggmp3 · 03-09-2004, 10:16 PM

how do I get alias to work.
Below is what I inputed, but it doesn't work.

Quote:

alias [cdrom[=mount /dev/cdrom /root/Desktop/cdrom]]

and

alias [ucdrom[=umount /dev/cdrom]]

xviddivxoggmp3 · 03-09-2004, 11:33 PM

i fixed my syntax with

Code:

alias ucdrom="umount /dev/cdrom"

i keep getting device is busy errors.
is there a reason for this?

slakmagik · 03-10-2004, 12:34 AM

Do 'mount' to see if it's already mounted.

And if any process (backgrounded shell, subshell, whatever) is in that directory, it's going to be 'busy'. Make sure that you cd all your shells/file managers/whatnot out of the mount point.

Do 'ps ux' if you still get it, because you probably missed a shell.

Might try making your alias point to '/mnt/cdrom' or whatever's in fstab, too, instead of the device directly.

xviddivxoggmp3 · 03-10-2004, 05:23 PM

Three questions...
(1)
How do we make the alias permanent.
It is gone after I logout.
None of the books I have give you a way to do this.
(2)
Do you mean to unmount the location I mounted my cdrom to?
I mounted it to /root/Desktop/cdrom.
So should I umount /root/Desktop/cdrom?

Quote:

Might try making your alias point to '/mnt/cdrom' or whatever's in fstab, too, instead of the device directly.

(3)
[edit1]
I just found the ps command in my book. Process reporting.
That is a good command to know. Thanks. Scratch the following question.
[/edit]
What is this?

Quote:

'ps ux'

darkRoom · 03-10-2004, 06:00 PM

hi
i put my alias's at the bottom of /etc/profile, of course that means that they are global. A workaround would be to add:

Code:

source ~/.bashrc

(in etc/profile)

and then make yorself a .bashrc in the home directory (if you dont already have one) in which you can put the alias's for each user.

At0mic_PC · 03-10-2004, 08:46 PM

Here is my .bashrc:

alias dfh='df -h'
alias more='less'
alias pa='ps aux'
alias pkgname='ls -l /var/log/packages/ | grep $1'
alias rtfm='man'

It's small cause I just found the joy of using it.

slakmagik · 03-11-2004, 02:49 AM

Re:#2: Yeah.

Code:

~
1014>> alias | grep cdrom                                                      
alias mcdr='mount -v /mnt/cdrom'
alias ucdr='umount -v /mnt/cdrom'

~
1015>> cat /etc/fstab | grep cdrom                                             
/dev/cdrom       /mnt/cdrom       iso9660     noauto,user,ro   0   0

~
1016>> ls -l /dev/cdrom                                                        
lrwxrwxrwx    1 root     root            8 Nov 26 12:17 /dev/cdrom -> /dev/sr1

~
1017>> ls -l /dev/sr1                                                          
brw-r-----    1 root     disk      11,   1 Apr 13  1999 /dev/sr1

My alias means to substitute 'ucdr' with 'umount -v /mnt/cdrom' which references /etc/fstab, which tells umount '/mnt/cdrom' means 'unmount dev/cdrom from that mountpoint' and '/dev/cdrom' is actually a link to '/dev/sr1'. (I have scsi emulation, hence the funky device.)

Anyway - then I just issue 'mcdr' and 'ucdr'. But 'mount' should show whether it's mounted or not and 'ps' should show if any processes are running that might be 'in' it. You have to have a mounted device and be clear of the mountpoint in order to unmount it. If that's the case, then I dunno why it's saying it's busy and refusing to unmount. Could try 'lsof', too, to see if there's any open files. That could hang it up, too.

Re:#1: my .bashrc is just a symlink and I stick everything in ~/.bash_profile so I don't have to worry with it but that's not SOP for reasons I have yet to figure out.

xviddivxoggmp3 · 03-11-2004, 11:51 PM

ok i finally got the .bashrc to save aliases for reboot and login.
How do you reload the .bashrc into your box w/o rebooting?
I'm getting tired of recogniziing an error in my script and then having to wait for the reboot to test the new script.
and how do you make alias commands accesable to non-su user?
ever time i try to execute cdr from a non-su user it says request can only be made by root.

At0mic_PC · 03-12-2004, 10:34 AM

Try shutting down the xterm. I found that if I had the xterm open when I changed something they wouldn't take.

bullium · 01-25-2005, 10:05 AM

You could just execute the .bashrc file.

Code:

. .bashrc