um mit ant einen gezipten mysqldump zu erstellen, gehe wie folgt vor
<target name="tstamp" description="create timestamp for further usage">
<echo message="create timestamp for further usage"/>
<tstamp/>
</target>
<target name="mkdir" description="create backup directory">
<echo message="create backup directory"/>
<mkdir dir="${backups}"/>
</target>
<target name="dump" description="create db dump and gzip it - depends on tstamp, mkdir" depends="tstamp, mkdir">
<echo message="create db dump and gzip it"/>
<exec executable="bash" dir="${backups}">
<arg value="-c"/>
<arg line='"mysqldump ${db} -u${db_user} -p${db_pass} | gzip > ${backups}/${db}_${DSTAMP}_${TSTAMP}.sql.gz"'/>
</exec>
</target>