58 lines
1.4 KiB
Bash
Executable file
58 lines
1.4 KiB
Bash
Executable file
#!/bin/dash
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# USAGE: erase-disk.sh <passes> <device>
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# Must be run as root
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usage() {
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echo "Usage: erase-disk.sh PASSES DEVICE"
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echo "Securely erase DEVICE with PASSES passes"
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echo
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echo "Flags:"
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echo " -h, --help \tDisplay this help message"
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echo
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echo "Options:"
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echo " DEVICE \tThe device to erase"
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echo " PASSES \tHow many times to erase DEVICE"
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echo
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echo "This script will securely erase a disk device with the specified amount"
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echo "of passes (rounds). It does so by overwriting the specified device with"
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echo "random data on the first pass, and with zeroes on the other passes."
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echo "Due to the nature of disk device access permissions, the script must"
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echo "be run as root."
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echo
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echo "erase-disk.sh is licensed under The Unlicense."
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}
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[ "$1" = "-h" -o "$1" = "--help" ] && usage && exit 0
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if [ $# -lt 2 ]; then
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echo "ERROR: Not enough options!"
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echo
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usage
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exit 1
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elif [ $# -gt 2 ]; then
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echo "ERROR: Too many options!"
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echo
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usage
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exit 1
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elif [ $(id -u) -ne 0 ]; then
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echo "ERROR: Must run as root!"
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echo
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usage
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exit 1
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fi
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echo "# Securely erasing the disk device $2"
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i=1
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while [ $i -le $1 ]; do
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[ $i -eq 1 ] && if="/dev/urandom" || if="/dev/zero"
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echo "\n- Begin pass $i with $if"
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dd if="$if" of="$2" status="progress"
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echo "- Syncing I/O"
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sync
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i=$(( i + 1 ))
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done
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