topic Shell Problem in Operating System - HP-UX

Shell Problem

Brian Dore — Thu, 23 Jun 2005 02:18:51 GMT

My problem is, how do I echo ${filesystem$i[$h]}? What needs to go where the $i is?

filesystem1[1]="north"

filesystem1[2]="south"

echo ${filesystem1[1]}

north

echo ${filesystem1[2]}

south

h=1

echo ${filesystem1[$h]}

north

((h=$h+1))

${filesystem1[$h]}

south

i=1

echo ${filesystem$i[$h]}

sh: ${filesystem$i[$h]}: The specified substitution is not valid for this command.

${filesystem"$i"[$h]}

sh: ${filesystem"$i"[$h]}: The specified substitution is not valid for this command.

Re: Shell Problem

Bejoy C Alias — Thu, 23 Jun 2005 07:28:10 GMT

I think u r trying to create a two dimensional array . See the attachment to see a workaround to emulate a two dimensional array ( it is for linux , u need to write the script with the same logic )

Re: Shell Problem

Mark Grant — Thu, 23 Jun 2005 08:02:12 GMT

99 times out of a hundred, when you think you need to do this, in fact you don't. Maybe if you were to explain in more details, the specifics of what you were after, it might be possible to come up with an alternative.

Re: Shell Problem

Bill Hassell — Thu, 23 Jun 2005 08:06:22 GMT

You have a spelling error. The array is filesystem1 but your failing example shows:

filesystem$i

You can avoid this type of problem (by getting a useful error message) using the set -u option at the start of your script. Any time an undefined variable is referenced (ie, echo) the script will stop and identify the location.

Re: Shell Problem

harry d brown jr — Thu, 23 Jun 2005 08:31:05 GMT

He is trying to do this:

filesystem1[1]="north"
filesystem1[2]="south"
filesystem2[1]="east"
filesystem2[2]="west"

then referencing the SUBSCRIPTS of the variables
"filesystem1"
and
"filesystem2"

He wants this to happen:
$i=1
$h=2
echo $filesystem$i[$h]
producing "south" as output

or

$i=2
$h=1
echo $filesystem$i[$h]
producing "east" as output

live free or die
harry d brown jr

Re: Shell Problem

Patrick Wallek — Thu, 23 Jun 2005 08:42:04 GMT

What about using a variable to address the filesystem$i issue?

Something like:

i=1
h=1

FS=filesystem${i}

echo ${FS[$h]}
north

i=2
h=2
FS=filesystem${i}

echo ${FS[$h]}
west

Re: Shell Problem

MarkSyder — Thu, 23 Jun 2005 09:01:08 GMT

Sorry, this is off-topic.

Mark - nice to see your name on here again. Where've you been?

Mark Syder (like the drink but spelt different)

Re: Shell Problem

Brian Dore — Thu, 23 Jun 2005 09:14:04 GMT

What I am actually trying to do is

Outer Loop:-

prompt the user for a server name

Inner Loop:-

Prompt the user for filesystems (1 at a time in this inner loop)

When all input has been gathered I want to display the information on screen

e.g.
_______________________________________
Server:- "Server Name"
Filesystems:- "Filesystem" "Filesystem" ...

Server:- "Server Name"
Filesystems:- "Filesystem" " Filesystem" ...

etc...
_________________________________________

Hope this makes my problem clearer.

Re: Shell Problem

Bejoy C Alias — Fri, 24 Jun 2005 01:39:53 GMT

I forgot to attach the script...

Re: Shell Problem

Ermin Borovac — Fri, 24 Jun 2005 07:12:40 GMT

You can do it like this

$ filesystem1[1]="north"
$ h=1
$ i=1
$ eval echo \${filesystem$i[\$h]}
north

Re: Shell Problem

Bejoy C Alias — Sat, 25 Jun 2005 06:04:21 GMT

Balle Balle.....
Brian.....Ermin's idea works.....