CODEWITHSUNDEEP
unixcat
Vicky
Vicky

Reputation: 3310

cat command loading file

Does cat command load the entire file into main memory?

for i in `cat file.txt`; do
    # some logic on i
done

Will this code has any performance issue when the file is large say 5-6 GB?

Upvotes: 1

Views: 1374

Answers (1)

pixelbeat
pixelbeat

Reputation: 31768

cat doesn't load the whole file in, but the process substitution in your for loop above will

If you have one entry per line you could instead:

while read line;
    # some logic on $line
done < file.txt

Upvotes: 3

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