bash loops

• Looping a file line by line

Looping a file line by line _

looping a file should be easy in bash but once you start making things more complicated, your solution is often the wrong one.

# Loop a file, line by line
# supports lines with spaces
# supports a program in the loop that can read from stdin

while IFS= read -r line <&3 || [[ -n "$line" ]]; do
    # Skip empty lines and lines starting with #
    [[ -z "$line" || "$line" == \#* ]] && continue
    echo "'$line'"
    (
        cd ..
        my-thing.sh "$line"
    )
done 3< todo.txt