Bash while read loop extremely slow compared to cat, why?

Question

A simple test script here:

while read LINE; do
        LINECOUNT=$(($LINECOUNT+1))
        if [[ $(($LINECOUNT % 1000)) -eq 0 ]]; then echo $LINECOUNT; fi
do         


        

Answer 1

Not really sure what your script is supposed to do. So this might not be an answer to your question but more of a generic tip.

Don't cat your file and pipe it to your script, instead when reading from a file with a bash script do it like this:

while read line    
do    
    echo $line
done