Question

The codes are below, I want to check some files whose file size is less than 410Bytes:

for file in *; do
    if [[ "$file" =~ ^dataset([0-9]+)$ && `du -b $file/${BASH_REMATCH[1]}_conserv.png` -lt 410 ]]; then
    cd $file
    $some_commands
    cd ..
    fi
done

However, when I run this script, it complains like this:

less_than_410.bash: line 2: [[: 13605   dataset4866/4866_conserv.png: syntax error in expression (error token is "dataset4866/4866_conserv.png")

Does anyone have ideas about how to fix this? Thanks!

Answer 1

du -b file

It will print file size and name. Use cut to get size only:

du -b file | cut -f 1