12-30-2009
Quote:
Originally Posted by
zaxxon
You might want to check if this is a chroot environment (it looks like one) or if that user has a restricted shell
Can you please explain about chroot and what is restricted shell ? In /etc/passwd the shell of viewer is /bin/bash
@alister : I checked the $PATH and yes it is /home/viewer/bin. And using the full path of other command has no problem. But I still have one question why I can use cd and echo command ( not full path ) while they're not in /home/viewer/bin . Because they're Built-in command ?
Thanks for help !!
Camus
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CHROOT(8) BSD System Manager's Manual CHROOT(8)
NAME
chroot -- change root directory
SYNOPSIS
chroot [-u -user] [-g -group] [-G -group,group,...] newroot [command]
DESCRIPTION
The chroot command changes its root directory to the supplied directory newroot and exec's command, if supplied, or an interactive copy of
your shell.
If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken
place. See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3).
Note, command or the shell are run as your real-user-id.
ENVIRONMENT
The following environment variable is referenced by chroot:
SHELL If set, the string specified by SHELL is interpreted as the name of the shell to exec. If the variable SHELL is not set, /bin/sh is
used.
SEE ALSO
chdir(2), chroot(2), environ(7)
HISTORY
The chroot utility first appeared in 4.4BSD.
SECURITY CONSIDERATIONS
chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges.
4.3 Berkeley Distribution October 6, 1998 4.3 Berkeley Distribution