Again tcsh problems

[DanielDD]

Hallo,

I created a minimal example:

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#!/bin/tcsh
set gf = \"
set namestr = "-pointsize 80 -draw $gf gravity NorthWest fill black text 0,12 a $gf"
echo $namestr
convert a.tif $namestr b.tif

The script produces error messages:

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-pointsize 80 -draw " gravity NorthWest fill black text 0,12 a "
convert: unable to open image `gravity': No such file or directory @ error/blob.c/OpenBlob/2705.
convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/504.
convert: unable to open image `NorthWest': No such file or directory @ error/blob.c/OpenBlob/2705.
convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/504.
....

However,

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convert a.tif -pointsize 80 -draw " gravity NorthWest fill black text 0,12 a " b.tif

works perfectly (I used copy and paste to get the value from namestr to the command line).

Any idea to get the script working.

Best regards,
Daniel

[snibgo]

Variable expansion occurs after the command has been split into words (which is when the quotes have an effect). I suggest you write it like this:

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#!/bin/tcsh
set namestr1 = "-pointsize 80 -draw"
set namestr2 = "gravity NorthWest fill black text 0,12 a"
convert a.tif $namestr1 "$namestr2" b.tif

[DanielDD]

@snibgo

This is quite correct, but it does not solve my problem.

I gave a minimal example. In some cases, $namestr is empty, and then,
your code leads to the execution:

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convert a.tif  "" b.tif 

which does not work. The quote-symbols " should be part of the string.

Best regards,
Daniel

[snibgo]

You want the shell to act on the quotes. As far as I know, *nix shells interpret quotes before expanding variables, so a quote within the variable value won't do what you want.

(Windows shells work differently, and can do what you want.)

The problem is with shell scripting, not IM. I suggest you ask in a shell scripting forum.

[DanielDD]

The problem is with shell scripting, not IM. I suggest you ask in a shell scripting forum.

Yes, you are right.

Daniel

[DanielDD]

@snibgo

I found a clumsy solution:

If namestr is empty, I leave namestr1 = "-pointsize 80 -draw" and let
namestr2 empty. Then, your code leads to the execution:

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convert a.tif -pointsize 80 -draw " " b.tif

which works perfectly.

Daniel

[DanielDD]

A solution is here:
https://www.unix.com/shell-programming- ... iable.html

One has simply to change the last line in my very first code to

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eval convert a.tif $namestr b.tif

Daniel