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With your recent bash, you have "Arithmetic Expansion" at your finger tips. You don't need the ´ls´ "command substitution". Try
for FN in *; do FL="$FL $FN"; if ! ((++CNT%10)); then echo "executing...

The split statement creates an array whose elements have the values of the substrings (separated by the FS) and consecutive indices starting from 1.
The individual assignments each create an...

Running the date command for every single data line in your log file definitively is an expensive method to determine the seconds for an arithmetic operation, but it works. The next step - esp. if we...

awk -F'"' '{ for(i=1; i<=NF; i++) { if($i ~ /^http/) print $i } } ' bookmarks.json

Could this work:
grep -o 'http:[^"]*' file