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lang-bash
nrofjpg=$( grep -c '\.jpg$' <<< ${FILES[*]} )Thegrep -cin your comment was the key it seems<<< ${FILES[*]}feeds the concatenation of the elements of the array with the first character of$IFStogrep -c(or worse in older versions of bash where that was subject to splitting before joining). So unless you have runIFS=$'\n'or some file names contain newline characters,grepwill only get one line of input. And again, as I said that won't work properly if file names contain newline characters.