File size: Difference between revisions

==Sh builtins only==

Tested on Alpine Busybox v1.35.0, passes shellcheck 0.8.0.

<syntaxhighlight lang="sh">

#!/bin/sh

unset PATH # No cheating!

countbytes(){

size=0

# Read the lines in the file

while read -r;do

size=$((size+${#REPLY}+1)) # +1 to account for the newline

done < "$1"

size=$((size+${#REPLY})) # Account for partial lines

echo "$size $1"

}

countbytes input.txt

countbytes /input.txt

</syntaxhighlight>