Create safe-dd.sh

safe-dd.sh

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+#!/bin/bash
+
+# REF: https://distrowatch.com/weekly.php?issue=20230619#tips
+# Some mods by kneutron 2023Jun
+
+# WRAPPER - This script invokes the dd command to copy a file. 
+# It first checks to make sure the target file (of) is not mounted.
+# Warning, this may not work with device names containing a space.
+
+if [ $# -lt 2 ]
+then
+  echo "Please provide an input file and an output file."
+  exit 1
+fi
+
+start=$(echo $@ | sed 's/of=/\^/')
+end=$(echo $start | cut -f 2 -d '^')
+target=$(echo $end | cut -f 1 -d ' ')
+
+echo "Checking $target"
+df | grep $target
+if [ $? -eq 0 ]
+then
+  echo "Output file $target is mounted. Refusing to continue."
+  exit 2
+fi
+
+echo "Executing nice dd $@ status=progress"
+time /usr/bin/dd $@ bs=1M status=progress
+sync
+echo "$(date) - Finished writing and sync."