is there a way to create a user and limit him to read,write and execute only in one direcotry.
the directory is already exsist and it belongs to dba group.
i would like to make this user can't even cd to another directory or even if he can he cant do anything in the other directories.
if anyone can help me with this and with the code in doing it, i would be very great full 
thanks in advance
this should be the default thing already.... that is.
if you create a home dir john as /home/john, make him as owner and give all permission... he will not be able to do anything with /home/tom or /home/jerry. ( make the permissions appropriately at tom & jerry )
He can manipulate anything under /home/john. are you looking for this -- read about chmod, chown.
if something else -- explain that ?
what if i want to limit his access to only one directory?
what you mean by only one directory ? -- only /home/john and he should not go to /home/john/Music or something else ?
If it is he can do anything with /home/john, and he should not go for /home/tom, then tom should be owner of that dir, and for others/group dont give read & execute permission.
Although I'm unsure about what precisely your requirements are, you might achieve that by using a combination of ACLs and a restricted shell like rksh.
i would like the user just to access /pcard17/trace
not his home directory
root@zfstest # df -h
Filesystem size used avail capacity Mounted on
/dev/dsk/c1t0d0s0 20G 9.8G 9.7G 51% /
/devices 0K 0K 0K 0% /devices
ctfs 0K 0K 0K 0% /system/contract
proc 0K 0K 0K 0% /proc
mnttab 0K 0K 0K 0% /etc/mnttab
swap 16G 1.7M 16G 1% /etc/svc/volatile
objfs 0K 0K 0K 0% /system/object
sharefs 0K 0K 0K 0% /etc/dfs/sharetab
/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1
20G 9.8G 9.7G 51% /platform/sun4u-us3/lib/libc_psr.so.1
/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
20G 9.8G 9.7G 51% /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
fd 0K 0K 0K 0% /dev/fd
swap 16G 792K 16G 1% /tmp
swap 16G 48K 16G 1% /var/run
/dev/dsk/c1t0d0s6 32G 32M 31G 1% /data
/dev/dsk/c1t1d0s0 20G 9.8G 9.7G 51% /bkp-root
iaspool 15G 3.6G 11G 25% /ias
oraclepool 15G 7.2G 7.5G 50% /oracle
pcard01pool 9.8G 1.2G 8.6G 12% /pcard01
pcard02pool 29G 5.5G 24G 19% /pcard02
pcard03pool 29G 5.0G 24G 18% /pcard03
pcard04pool 29G 4.0G 25G 14% /pcard04
pcard05pool 49G 29G 20G 60% /pcard05
pcard06pool 49G 22G 27G 46% /pcard06
pcard07pool 49G 25G 24G 51% /pcard07
pcard08pool 49G 19G 30G 38% /pcard08
pcard09pool 29G 9.5G 20G 33% /pcard09
pcard10pool 29G 6.0G 23G 21% /pcard10
pcard11pool 29G 11G 19G 37% /pcard11
pcard12pool 29G 6.0G 23G 21% /pcard12
pcard13pool 29G 2.9G 26G 11% /pcard13
pcard14pool 29G 2.9G 26G 11% /pcard14
pcard15pool 29G 6.0G 23G 21% /pcard15
pcard16pool 29G 1.6G 28G 6% /pcard16
pcard17pool 49G 14G 35G 28% /pcard17
pcard18pool 29G 4.1G 25G 14% /pcard18
pcard19pool 29G 22K 29G 1% /pcard19
pcard20pool 29G 2.1G 27G 8% /pcard20
pcardbkppool 492G 106G 387G 22% /pcardbkp
/vol/dev/dsk/c0t0d0/sol_10_509_sparc
2.5G 2.5G 0K 100% /cdrom/sol_10_509_sparc
root@zfstest # cd /pcard17/trace
root@zfstest # pwd
/pcard17/trace
root@zfstest #cd ..
root@zfstest # ls -l
total 475
drwxrwxrwx 2 ora10g dba 2 Mar 12 2007 lost+found
drwxr-xr-x 2 root root 8 Sep 6 13:04 oper
drwxrwxrwx 3 ora10g dba 2518 Oct 25 14:25 trace
root@zfstest #
A user denied read access to his own home directory would fail to log in to the system.
Example option:
The Restricted Bash Shell
If Bash is started with the name rbash, or the `--restricted' option is supplied at invocation, the shell becomes restricted. A restricted shell is used to set up an environment more controlled than the standard shell. A restricted shell behaves identically to bash with the exception that the following are disallowed: