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diff --git a/functions/gztobz2 b/functions/gztobz2
new file mode 100644
index 0000000..6c57f80
--- /dev/null
+++ b/functions/gztobz2
@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Convert multiple compressed gzip files to bzip2.
+# Usage: gztobz2 [FILES]
+gztobz2()
+{
+    if [ $# = 0 ]; then
+	echo "$0: -- Convert multiple compressed gzip files to bzip2."
+	echo "Usage: $0: [FILES]"
+	return 1
+    fi
+    
+    while [ $# -ne 0 ]; do
+	local ORIG_GZIPPED_FILENAME=${1}
+	
+	# Checking if input file exist.
+	if [ ! -f $1 ]; then
+	    echo "$0: File ${ORIG_GZIPPED_FILENAME} not found."
+	    return 1
+	fi
+	
+	# Checking if input file is a valid gzipped file.
+	gzip -t ${ORIG_GZIPPED_FILENAME}
+	if [ $? -ne 0 ] ; then
+	    echo "$0: File ${ORIG_GZIPPED_FILENAME} is not a valid gzip file."
+	    return 1
+	fi
+	
+	# Obtaining uncompressed name of file
+	local FILENAME=$(gunzip -l ${ORIG_GZIPPED_FILENAME} | sed '1d' | sed 's/\(.*\)% \(.*\)/\2/')
+	
+	# Decompressing file to standard output and piping result to bzip2
+	gunzip ${ORIG_GZIPPED_FILENAME} --stdout | bzip2 --best > ${FILENAME}.bz2
+	if [ $? -ne 0 ] ; then
+	    echo "$0: Error converting file ${ORIG_GZIPPED_FILENAME} to bzip2."
+	    return 1
+	fi
+	
+	# Keeping the original file's timestamp
+	touch --reference=${ORIG_GZIPPED_FILENAME} ${FILENAME}.bz2
+	
+	# Deleting original gzipped file
+	if [ -f ${FILENAME}.bz2 ]; then
+	    rm ${ORIG_GZIPPED_FILENAME}
+	fi
+	
+	shift
+    done
+}