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convert_spaces_to_tabs.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+if test "$#" -lt 1
+then
+	echo "Usage: $0 file ..."
+	exit 2
+fi
+
+for file in "$@"
+do
+	# Do the sed magic: keep replacing 4 spaces at the begining of line
+	sed -i -re '
+		: loop
+		s/^(	*)    /\1	/
+		t loop
+		' "$file"
+done