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
Check Out this Related Man Page
chroot(1M) System Administration Commands chroot(1M)NAME
chroot - change root directory for a command
SYNOPSIS
/usr/sbin/chroot newroot command
DESCRIPTION
The chroot utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed
to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot.
Notice that redirecting the output of command to a file,
chroot newroot command >x
will create the file x relative to the original root of command, not the new one.
The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to
the current root of the running process.
This command can be run only by the super-user.
RETURN VALUES
The exit status of chroot is the return value of command.
EXAMPLES
Example 1: Using the chroot Utility
The chroot utility provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is
necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem.
example# mkdir /tmp/lib; cd /lib
example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 libsec.so.1 /tmp/lib
example# cp /usr/bin/tar /tmp
example# dd if=/dev/rmt/0 | chroot /tmp tar xvf -
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO cd(1), tar(1), chroot(2), ttyname(3C), attributes(5)NOTES
Exercise extreme caution when referencing device files in the new root file system.
References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the file descriptor is
unknown after chroot is run.
SunOS 5.10 15 Dec 2003 chroot(1M)
hi, this echo $SHELL will give the shell name.. how to get the other list of variables (besides SHELL) values?
and also, different shells have different variable names (example SHELL) (10 Replies)
The root default shell is defined incorrectly in the /etc/passwd file and thus when I try and log in as root I get a NO SHELL error and get logged out..
Anyway of fixing this - as I dont have a session logged in as root currently and I am unable to initiate a new session as I keep getting the... (5 Replies)
Hey everyone, I need a little help....
I need to add my root user to a new group I have created, I'm just alittle unsure how to do this.
I know I need to use the 'useradd' command, the user 'root' needs to be added to a new group called 'beoper' and retain his membership in the following... (7 Replies)
In unix prompt when i run following command ...
# current user is "aaa" (not root)
# I want to run some command with "bbb" user then i using
su - bbb -c "command"
# Then, my shell request for user "bbb" password before running command
If I want to add this command to shell script which... (5 Replies)
Is is possible switch user from a non-root user to root user without entering the password interactively inside a korn shell script which is run by a non-root user?
e.g. I have a non-root user called infodba who is in dba group and I want to create a shell script which is executed by infodba... (5 Replies)
Hi all, i hope i got this in the right place, what i am trying to do is make a program only run by root, ie
for instance user fred is logged in and uses firefox, what id like to do is change that so that when fred wants to use firefox he will be asked to enter root password before he is allowed to... (14 Replies)
Hey there
I have a problem and i was hoping that you guys could help me out
I want to copy a user privileges to a group and i need to copy all privileges(Recursively) every directory with all its sub directories and I tried some solution and it did not work. I used the following command:-
... (14 Replies)
I have a simple sandbox program which runs a command as user "nobody" in a chroot jail. It sets resource limits with setrlimit, changes the user id with setuid, changes the root dir with chroot, and then calls exec to execute the command given as command line parameters. It is of course a... (8 Replies)
Hi all,
I'm very, very new to scripting (let alone SHELL) and was wondering if anyone could help me out as I seem to be in a spot of bother.
I collect data (.dat files) which are automatically seperated into several sub directories, so the file paths I'm reading in at the moment would be... (11 Replies)
I am completely new to Shell scripting and I have almost no idea what I'm doing here. I'm not a stranger at all to programming, but the way SHELL is done drives me to insanity. Here's my current issue:
1. We are to create a BASH script called rafactor.sh
This program takes in two (or three)... (6 Replies)
Unix box server version
***********
>uname -r
B.11.00
>echo $SHELL
/usr/bin/ksh
--> in this server, I have the path like /IMbuild/dev/im0serv1
---> in that directory I have the folders startup(.jsp files nearly 100 jsp's ) and scripts(contains .js files nearly 100 files) ... (9 Replies)
Hi,
I'm the root user on my computer, but I'm writing a script that does a lot of file handling. Every time I create a file or directory it automatically requires root privileges. Is there a way I can just create a file that the user can access without a password?
For example in my script I... (20 Replies)
Hi experts
cp bin root src /mnt
but not copy bin/bigfile
any help?
( I post this thread in the "redhat" forum wrongly, I don't know how to withdraw that question in that wrong forum)
Thanks (6 Replies)