Linux – RBASH how to prevent users exiting to normal bash

bashbashrclinuxrhel6

I have set up some test account to beta implement rbash to limit users from doing to much on the server. Currently I am using .bash_profile to set bash -r for these profiles. But when a user types exit they drop into the normal bash shell.

I would like to make it so when they type exit to logoff the server. Otherwise bash -r won't help restrict that access.

Please let me know any thought you have.

Best Answer

Set the users' login shell to rbash via the -s option of useradd or usermod, eg.

usermod -s /bin/rbash luser

if your rbash executable is at /bin/rbash.

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Bash Scripting – How to Determine if a Bash Variable is Empty

This will return true if a variable is unset or set to the empty string ("").

if [ -z "${VAR}" ];

Bash – How to create a UUID in bash

See the uuidgen program which is part of the e2fsprogs package.

According to this, libuuid is now part of util-linux and the inclusion in e2fsprogs is being phased out. However, on new Ubuntu systems, uuidgen is now in the uuid-runtime package.

To create a uuid and save it in a variable:

uuid=$(uuidgen)

On my Ubuntu system, the alpha characters are output as lower case and on my OS X system, they are output as upper case (thanks to David for pointing this out in a comment).

To switch to all upper case (after generating it as above):

uuid=${uuid^^}

To switch to all lower case:

uuid=${uuid,,}

If, for example, you have two UUIDs and you want to compare them in Bash, ignoring their case, you can do a tolower() style comparison like this:

if [[ ${uuid1,,} == ${uuid2,,} ]]

Best Answer

Related Solutions

Bash Scripting – How to Determine if a Bash Variable is Empty

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