How to use bash shell variable in exiftool command

[SampsonF]

I am trying to run this in a terminal:

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EXIFCMD="TestName"
EXIFDIR="/var/vols/Pics"
exiftool -d %Y/week%W/%A \
   '-$EXIFCMD<${FileModifyDate}/%f%-c.%le' \
   -r $EXIFDIR


But I got this result:

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Warning: No writable tags set from /var/vols/Pics/IMG_20180723_203020.jpg
Warning: Invalid tag name '${exifcmd}' - /var/vols/Pics/IMG_20180723_203020.jpg


My intention is to change EXIFCMD=filename after the dry run, and rerun the same command.

[Phil Harvey]

Maybe something like this:

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EXIFCMD="TestName"
EXIFDIR="/var/vols/Pics"
exiftool -d %Y/week%W/%A \
   -$EXIFCMD'<${FileModifyDate}/%f%-c.%le' \
   -r "$EXIFDIR"

Here I have quoted $EXIFDIR in case a directory name contains spaces.

- Phil

[SampsonF]

Thank you very much!

It works.