$ pwd
/home/knob
$ cat t1.sh
#!/bin/ksh
if tar cf - . | (cd /var/tmp/dump && tar xf -); then
   echo "success"
else
   echo "failure"
fi
$ rm -fr /var/tmp/dump
$ ./t1.sh
./t1.sh[2]: /var/tmp/dump:  not found.
failure
$ mkdir /var/tmp/dump
$ ./t1.sh
success
$ ls -l
total 8
-rwxrwxrwx    1 knob    devel         108 30 Aug 17:51 t1.sh
$ ls -l /var/tmp/dump
total 8
-rwxrwxr-x    1 knob    devel         108 30 Aug 17:51 t1.sh