Bash Script

Tag: loop

  • Move small files to separate directory in one command

    Loop files under a set weight to move it to a directory.

    for f in `find . -iname "*.JPG" -size -500k`; do mv ${f} small; done

  • Create a filesystem in a file

    Some times you need a new filesystem, for testing purposes or for whatever and you dont have access to a physical device. You can create a filesystem within  a file as follows:

    dd if=/dev/zero of=myfsys bs=512M count=1 # creating a 512M zeros file
    mke2fs myfilesys # creating a file system out of the file

    mount myfilesys /mnt -o loop=/dev/loop0 # mounting it as a loop device

    mkdir /mnt/point1 # creating a mount point
    mount /dev/loop0 /mnt/point1 # mounting

    df /mnt/point1/ # its alive!

    # results with:
    # Filesystem 1K-blocks Used Available Use% Mounted on
    # /dev/loop0 516040 400 489428 1% /mnt/point1