own cd command

Ictus · 03-05-2006, 01:08 PM

Hi!

I've written a script "netmount" which can easily mount and manage the network ressources of my local area network.

Till now i'm doing it this way:

# netmount Music
# cd /mnt/192.168.1.13/Music

I'd rather like to do it like this:

# netmount Music --cd

That if the parameter --cd is passed the netmount command changes
directory automatically.
How can i achieve this? If i use "cd" within the netmount-script it has no effect on my actual shell.

Brian1 · 03-05-2006, 01:34 PM

Post contents on netmount script?

bigearsbilly · 03-06-2006, 05:49 AM

you can 'dot' the script, though an 'exit' will kill your shell
or
you can make it a function in your current shell
like

Code:

netmount()
{
   blah
   blah
   cd
}

Ictus · 03-06-2006, 09:15 AM

The netmount script currently looks like this:

Code:

#!/usr/bin/perl
 
# mountet Freigaben aus Windows-Netzwerken
#
# Usage: netmount [Optionen] [Freigabe]
#
# Standard für IP ist 192.168.1.13 (für MEIN Netzwerk)


$IP = "192.168.1.13";
$freigabe = "";
$mount = 1; # 1 = mounten; 0 = unmounten

if(scalar(@ARGV) < 1)
{
 print "missing or wrong argument\n";
}
else
{

 # Argumente durchlaufen
 for($i=0;$i<scalar(@ARGV);$i++)
 {
  $param = $ARGV[$i];
 
  # OPTIONEN VERARBEITEN
  if(substr($param,0,1) eq "-")
  {
   # -i : IP angeben
   if($param eq "-i") { $IP = $ARGV[$i+1]; $i += 1; }
   elsif($param eq "-u") { $mount = 0; } # unmounten
  }
  else
  {
   # Freigabe
   $freigabe = $param;
  }
 }

 if($freigabe eq "")
 {
  print "nothing to mount.\n";
  exit;
 }
 
 $host_dir = "/mnt/$IP";
 $dir = "/mnt/$IP/$freigabe";

 # Hauptverzeichnis für Freigaben dieser IP erstellen
 unless( -d $host_dir)
 {
  print "creating host dir...";
  if(mkdir("/mnt/$IP", 0755)) {
    print "ok\n";
  }
  else {
    print "fail\n";
  }
 } 

 # Verzeichnis für Freigabe erstellen
 unless( -d $dir)
 {
  print "creating mount dir...";
  if(mkdir($dir, 0755)) {
    print "ok\n";
  }
  else {
    print "fail\n";
  }
 }

 if($mount == 1) # mounten
 {
  print "mounting $freigabe at $dir...\n";
  print `sudo mount -t cifs //$IP/$freigabe $dir`;
 }
 else # unmounten und Verzeichnisse wieder löschen
 {
  print "unmounting $freigabe...\n";
  print `sudo umount $freigabe`;
  print "deleting $dir...";
  if(rmdir($dir)) { print "ok\n"; }
  else { print "fail\n"; }
 }
}

The problem is, that it is a Perl script. I guess i can't use Perl in a bash function. :-\

bigearsbilly · 03-06-2006, 09:22 AM

aaah! hmm!
well...

david_ross · 03-06-2006, 11:23 AM

You could use an alias as well as the script:
alias somecommand='real_command.pl $@;cd $1'

You may want to return a specific exit code from real_command.pl and use it to check if you need to run the cd command.

Ictus · 03-06-2006, 01:06 PM

Thanks for your help!
I finally made it.

)

I changed the netmount script so that it only echos the direction where the ressource was mounted, on success. Then i created that tiny function in my .bashrc file:

Code:

function xmount()
{
 DIR=`netmount $1`;
 cd $DIR;
}

Amazingly easy. lol

Thanks again, u gave me the necessary ideas to achieve my goal.

ta0kira · 03-06-2006, 05:51 PM

I would have never thought of that. Could you also have changed PWD and exported it?
ta0kira

Ictus · 03-08-2006, 10:47 AM

Sorry, i dont really understand what you mean. Which password, and exporting what?

ta0kira · 03-08-2006, 12:17 PM

I mean the PWD bash environmental variable; it stores the current path. Type in 'env | grep $PWD' in bash and it should show your current path. I was just talking about changing that and exporting it from the script. I don't know how that would affect other open shells, however.
ta0kira