dhil · October 9, 2020 14:19
diff --git a/watermark b/watermark
 #!/usr/bin/env bash
 # Acknowledgement: this idea is adapted from Raphaël Rigo (https://twitter.com/_trou_/status/1313951783182651393?s=20).

 if [[ -z "${1+x}" || -z "${2+x}" || -z "${3+x}" ]]; then
 	echo "usage: $(basename $0) <source-file> <text> <output-file>"
 	exit 0
 fi

 convert -density 150 -fill  "rgba(255,0,0,0.25)"  -gravity Center -pointsize 80 -draw "rotate -45 text 0,0 \"$2\""  "$1" "$3"
	#!/usr/bin/env bash
	# Acknowledgement: this idea is adapted from Raphaël Rigo (https://twitter.com/_trou_/status/1313951783182651393?s=20).

	if [[ -z "${1+x}" \|\| -z "${2+x}" \|\| -z "${3+x}" ]]; then
	echo "usage: $(basename $0) <source-file> <text> <output-file>"
	exit 0
	fi

	convert -density 150 -fill "rgba(255,0,0,0.25)" -gravity Center -pointsize 80 -draw "rotate -45 text 0,0 \"$2\"" "$1" "$3"