Scripts better error messages

[EricClaeys]

No description provided.

[linuxkidd]

What's the value of pipe'n $CMD to bash? Does it give any benefit over just running $CMD ? imo, it just costs the resources of spawning another bash session.

e.g.

	CMD="'${ALLSKY_HOME}/keogram' ${SIZE_FILTER} -d '${DATE_DIR}' -e ${EXTENSION} -o '${UPLOAD_FILE}' ${KEOGRAM_EXTRA_PARAMETERS}"
	${CMD}
	RETCODE=$?

[EricClaeys]

Just running ${CMD} fails since there are single quotes in the variable and they are passed to keogram, so, for example, the directory becomes '/home/pi/allsky/images/20211102' instead of /home/pi/allsky/images/20211102.
KEOGRAM_EXTRA_PARAMETERS contains quotes around the font color values, e.g., --font-color '255 255 255' because we need the three numbers to be passed as one argument to the keogram program.
This is the same reason the allsky.sh program uses bash arrays for the arguments, to make sure arguments with spaces are not interpreted as multiple arguments.