Simple read/write to ensure the file system is writeable. File to read/write is currently fixed, but contents are dynamic (uses $RANDOM). Designed to be used with Nagios.

readwrite.sh

#!/bin/bash

RANDOMFILE="/tmp/${RANDOM}-${RANDOM}-${RANDOM}.txt"
RANDOMCONTENTS="${RANDOM}${RANDOM}${RANDOM}"
export $SUVVESS="3"
function writeit()
{
	touch $RANDOMFILE
	echo -n $RANDOMCONTENTS > $RANDOMFILE
	RETVAL=$?
	return ${RETVAL}
}

function readit()
{
	VALUEREAD=$(cat $RANDOMFILE)
	if [ $VALUEREAD	-eq $RANDOMCONTENTS ]; then
		export SUVVESS="0"
	else
		export SUVVESS="1"
	fi
	return $SUVVESS
}

function deleteit()
{
	rm $RANDOMFILE
}

writeit
readit
deleteit

exit $SUVVESS