How to execute imagemagick with a string as input for filenames

I am trying to write a code to do the below.

1: Get all the directory names from input line into a string (Number of directory inputs could vary)

2: For all the tiff files in those directories montage the images (using imagemagick) with the same names and save it in the main folder or given folder.

I want to combine two or more images (depending on the number of directories in the command line input). Each directory has image outputs with same name to the other directory. I wanna combine files with the same names from given directories

The code I wrote is below but its not passing $name as variable to montage command. What am I doing wrong here? Any help would be greatly appreciated.

for arg in "$@"; do # 
n1=$arg
fname =$n1"\${name} " #Get all the directory names in a string with $name at the end. for eg: Baseline/$name
done
echo $fname

for n in $arg/*.tif; do
name="$(basename "$n")"
name1=$(echo "$name" | cut -f 1 -d '.')
montage -tile 3x3 $fname name1.png
exit
done

More Details

CodePudding user response：

Updated Answer

Thank you for the clarification, you can do what you want if you save the following as monty.sh and make it executable with:

chmod  x monty.sh

Here's the code:

#!/bin/bash

# Goto first subdirectory and take it off args list
cd "$1"
shift

# Grab remaining directory names into array
friends=( "$@" )
>$2 echo "DEBUG: friends=${friends[@]}" 

# Iterate over files in first directory
for this in *.tiff ; do
   >&2 echo "DEBUG: this=$this"
   # Generate list of files to montage
   { 
      # ... starting with this one...
      echo "$this"
      # ... and adding in his friends
      for friend in "${friends[@]}" ; do
         next="../${friend}/${this}"
         >&2 echo "DEBUG: next=$next"
         if [ -f "$next" ] ; then
             echo "$next"
         else
             >&2 echo "ERROR: file $next is missing"
         fi
      done
    } | magick montage -tile 3x @- ../"${this/tiff/png}"
done

Then your command will be:

./monty.sh Output1 Output2 Output3

or, more succinctly:

./monty.sh Output{1,2,3}

In case you are unfamiliar with bash syntax, the code in the middle of the for loop is essentially doing:

...
...
{ 
   echo first filename to montage onto stdout
   echo second filename to montage onto stdout
   echo third filename to montage onto stdout
} | magick montage <ALL FILENAMES ON STDIN> result.png

So it is important that all error messages inside {...} are sent to stderr else the error messages will go to the montage command which will interpret them as filenames. That's why all the debug statements start with >&2 echo ... because that directs them to stderr so they don't get mixed up with stdout.

Original Answer

I don't understand what you are trying to do, but if you can write all the filenames into ImageMagick's stdin, you can make it montage them like this:

find . -name "*.tif" -print | magick montage -geometry  0 0 -tile x3 @- result.png