Hi, I have a csh script in which I'd like to do set up a list of vars
and then to chk each of these are set, something like the below.
However, I can't find the magic incantation that allows to to check
${$Vars} eg if $InMetFiles is set on the first loop - suggestions
welcome!

#!/bin/csh
foreach Vars (InMetFiles InTerFile OutDir)
echo Checking $Vars...
if ( ${?Vars} == 0) then
echo $Vars not set - aborting
exit 1
endif
end




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michael wrote:

Hi, I have a csh script in which I'd like to do set up a list of vars
and then to chk each of these are set, something like the below.
However, I can't find the magic incantation that allows to to check
${$Vars} eg if $InMetFiles is set on the first loop - suggestions
welcome!

#!/bin/csh
foreach Vars (InMetFiles InTerFile OutDir)
echo Checking $Vars...
if ( ${?Vars} == 0) then
echo $Vars not set - aborting
exit 1
endif
end



maybe use "" (empty string) instead of 0 in the comparison.

HTH

Wackojacko


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On Wed, 2008-06-25 at 15:02 +0100, Wackojacko wrote:
> michael wrote:
> > Hi, I have a csh script in which I'd like to do set up a list of vars
> > and then to chk each of these are set, something like the below.
> > However, I can't find the magic incantation that allows to to check
> > ${$Vars} eg if $InMetFiles is set on the first loop - suggestions
> > welcome!
> >
> > #!/bin/csh
> > foreach Vars (InMetFiles InTerFile OutDir)
> > echo Checking $Vars...
> > if ( ${?Vars} == 0) then
> > echo $Vars not set - aborting
> > exit 1
> > endif
> > end
> >
>
> maybe use "" (empty string) instead of 0 in the comparison.

but I want to check that $InMetFiles is non-empty and then check
$InTerFile is non-empty, not that $Vars is non-empty...


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On Jun 25, 9:40 am, michael <c...@networkingnewsletter.org.uk> wrote:
> Hi, I have acshscript in which I'd like to do set up a list of vars
> and then to chk each of these are set, something like the below.
> However, I can't find the magic incantation that allows to to check
> ${$Vars} eg if $InMetFiles is set on the first loop - suggestions
> welcome!
>
> #!/bin/csh
> foreach Vars (InMetFiles InTerFile OutDir)
> echo Checking $Vars...
> if ( ${?Vars} == 0) then
> echo $Vars not set - aborting
> exit 1
> endif
> end
>
> --
> To UNSUBSCRIBE, email to debian-user-REQU...@lists.debian.org
> with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org

its ugly but I think this works

#!/bin/csh

foreach Vars (Var1 Var2 Var3)
echo checking $Vars...
setenv temp '${'$Vars'}'
setenv temp2 `eval echo 'X'$temp >&/dev/null`
if ( "$status" != "0" ) then
echo $Vars not set - aborting
exit 1
endif
end


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On Wed, 2008-06-25 at 08:03 -0700, ss11223 wrote:
> On Jun 25, 9:40 am, michael <c...@networkingnewsletter.org.uk> wrote:
> > Hi, I have acshscript in which I'd like to do set up a list of vars
> > and then to chk each of these are set, something like the below.
> > However, I can't find the magic incantation that allows to to check
> > ${$Vars} eg if $InMetFiles is set on the first loop - suggestions
> > welcome!
> >
> > #!/bin/csh
> > foreach Vars (InMetFiles InTerFile OutDir)
> > echo Checking $Vars...
> > if ( ${?Vars} == 0) then
> > echo $Vars not set - aborting
> > exit 1
> > endif
> > end
> >
> > --
> > To UNSUBSCRIBE, email to debian-user-REQU...@lists.debian.org
> > with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
>
> its ugly but I think this works
>
> #!/bin/csh
>
> foreach Vars (Var1 Var2 Var3)
> echo checking $Vars...
> setenv temp '${'$Vars'}'
> setenv temp2 `eval echo 'X'$temp >&/dev/null`
> if ( "$status" != "0" ) then
> echo $Vars not set - aborting
> exit 1
> endif
> end

ah, I see rather than testing a variable we try and use it and catch any
error... it seems to work as you say... although this seems slightly
more elegant if less easy to add new VarN to:

if ( $?InMetFiles == 0 || $?InTerFile == 0 {etc}) then
echo prob
exit -1
endif


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On Jun 25, 12:40 pm, michael <c...@networkingnewsletter.org.uk> wrote:

> ah, I see rather than testing a variable we try and use it and catch any
> error... it seems to work as you say... although this seems slightly
> more elegant if less easy to add new VarN to:
>
> if ( $?InMetFiles == 0 || $?InTerFile == 0 {etc}) then
> echo prob
> exit -1
> endif
>
> --

Not quite, see the section for "eval" in the csh man page. The idea
is to use
eval to re-evaluate the variable after the name substitution.

Here is a cleaner version of the concept:


#!/bin/csh

setenv Var1 3

foreach Vars (Var1 Var2 Var3)
echo checking $Vars...
setenv temp '${?'$Vars'}'
eval "setenv temp2 $temp"
if ( "$temp2" != "1" ) then
echo $Vars not set - aborting
exit 1
endif
end


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On Wed, 2008-06-25 at 08:03 -0700, ss11223 wrote:
> On Jun 25, 9:40 am, michael <c...@networkingnewsletter.org.uk> wrote:
> > Hi, I have acshscript in which I'd like to do set up a list of vars
> > and then to chk each of these are set, something like the below.
> > However, I can't find the magic incantation that allows to to check
> > ${$Vars} eg if $InMetFiles is set on the first loop - suggestions
> > welcome!
> >
> > #!/bin/csh
> > foreach Vars (InMetFiles InTerFile OutDir)
> > echo Checking $Vars...
> > if ( ${?Vars} == 0) then
> > echo $Vars not set - aborting
> > exit 1
> > endif
> > end
> >
> > --
> > To UNSUBSCRIBE, email to debian-user-REQU...@lists.debian.org
> > with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
>
> its ugly but I think this works
>
> #!/bin/csh
>
> foreach Vars (Var1 Var2 Var3)
> echo checking $Vars...
> setenv temp '${'$Vars'}'
> setenv temp2 `eval echo 'X'$temp >&/dev/null`
> if ( "$status" != "0" ) then
> echo $Vars not set - aborting
> exit 1
> endif
> end
>

it only works if csh is invoked without -e (stop on error)


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