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I have a Nautilus script that I would like to modify so it performs a single operation using multiple selected files as input. Can someone please explain how to achieve this?

I tried command $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS and what the script does is execute command file1, then command file2 as two discrete operations. That doesn't work for my use case, instead I need the script to execute command file1 file2.

If it matters, I am using it with the command align_image_stack which needs 2 or more image files as input. I started Nautilus from a terminal to see error messages and I get "align_image_stack: At least two files need to be specified". I've tested a few commands shown below, but all produce the same error message. I think the problem is the variable $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS produces newlines, but I don't know how else to capture selected file paths.

align_image_stack "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS"
align_image_stack $(echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS")
align_image_stack printf("$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS")
echo -n "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | xargs -I align_image_stack "{}"
  • Have you tried xargs -L 1 or echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | while IFS= read -r filepath; do align_image_stack "$filepath" ; done ? – Sergiy Kolodyazhnyy Jul 4 '18 at 23:35
  • xargs -L 1 produces the error "Precondition violation / Unable to open file '{}'" and the second produces the same error as before, "align_image_stack: At least two files need to be specified". – Tom Brossman Jul 5 '18 at 6:19
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I was never able to get $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS working, but here is what did work instead:

command $(echo -n "$@")

I believe this is called command substitution, and the "$@" characters insert all selected files into the command together as input, with the -n argument suppressing newlines after echo lists them.

If you ever need to align and fuse together a group of bracketed photos, here's a Nautilus script which is now tested and working perfectly. It outputs the finished product to your desktop (file name is the current time) and cleans up all temporary files after:

#!/bin/bash
align_image_stack -a BATCH -C $(echo -n "$@") && enfuse -o ~/Desktop/$(date '+%Y-%m-%d-%T').tif BATCH*.tif && rm BATCH*.tif

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