I'm having a problem with something I can't really figure out by myself. I've tried to do it with a for loop, but I'm pretty sure it won't work, if I'm not mistaken.
Basically, what I'm trying to do is test some variables and if any of them is not empty, add the values of these variables to the list. For example:
Code:
sub1="subtitle1.idx"
sub2=
sub3="subtitle3.idx"
for i in "$sub1" "$sub2" "$sub3"; do
MP4SUBS="-add $i"
done
MP4Box -add video.h264 -add audio.aac $MP4SUBS
This does not work with a for loop, as you know. I know this can be done with an if conditional, but how do I deal if I have lots of sub* variables? An if conditional is not really recommended here, is it? Any suggestion how to do this in a simple way, if possible?
mp4="" && for i in {1..10}; do [[ -z $(eval "echo \$sub$i") ]] && echo empty || mp4="$mp4 -add $(eval "echo \$sub$i")"; done
Now $mp4 should contain the value of each non-empty variable from sub1 up to sub10.
[[ -z ]] tests if something is of value zero. If it is, echo empty, if not append it to your variable. You have to use eval to construct the variable name.
This is a really messy solution. The next time you should use an array.
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