Legacy ImageMagick Discussions Archive

Hallo,

I created a minimal example:

#!/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:

Code: Select all

-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,

Code: Select all

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

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:

Code: Select all

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

@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:

Code: Select all

convert a.tif  "" b.tif

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

Best regards,
Daniel

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.

snibgo wrote: ↑2018-08-29T13:47:40-07:00 The problem is with shell scripting, not IM. I suggest you ask in a shell scripting forum.

Yes, you are right.

Daniel

@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:

Code: Select all

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

which works perfectly.

Daniel

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

Code: Select all

eval convert a.tif $namestr b.tif

Daniel

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