+ #We try to run tar on the remote computer
+ # c create archive
+ # C change to directory first
+ # - output to stdout (we pipe to gzip, then to dd)
+ # . where to start taring (see C)
+ # $lastcmd only files newer than this
+ # --exclude-from file to get exclusion pattern from
+ # pipe to gzip, which in turn pipes over the ssh-stream
+ # ..to dd, to output to a file. We surpress messages from dd.
+ # And at last, redirect stderr to stdout, to get output logged.
+ TARFILE=$DATE.tmp
+ TARCMD="ssh $computer \"$tar --one-file-system -cf - -C $filesystem . $lastcmd \
+ --exclude-from=$exf | gzip\" | (dd of=$TARFILE 2> /dev/null) 2>&1"
+ echo "cmdline: $TARCMD"
+ eval $TARCMD
+
+ # Ideally, we should check wether the tar command returned 0 or not, but it
+ # seems a pipe in bash returns the value of the last command in the pipe.
+ # Instead, we check wether the resulting file has zero size, in which case we
+ # consider it an error.
+ if [ -s $TARFILE ]; then
+ echo `date`": command probably ran without errors."
+ #perhaps it did work
+ mv $TARFILE $DATE.tgz
+ #make a filelist.
+ #update the datefile if the filelist is ok.
+ tar tvfz $DATE.tgz > $DATE.idx 2>&1 &&
+ echo $DATEs > ../.date &&
+ touch -t $DATE ../.date
+
+ #make a sortet filelist
+ grep -v ^d $DATE.idx | sort -n -r +2 > $DATE.sdx
+
+ #fix perm
+ chmod 600 *tgz #only for us
+ chmod 644 *sdx *idx 2>/dev/null #everyone can read