Visit The New, Modern Unix Linux Community


How do i change to super user then revert back to ordinary user ,using shell script?


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How do i change to super user then revert back to ordinary user ,using shell script?
# 1  
How do i change to super user then revert back to ordinary user ,using shell script?

Hi all,

I am trying to eject the cdrom from a livecd after certain stage...
Now assuming that it is possible to eject,please consider my issue!!!

The OS boots into a regular user by default...so i am unable to use the eject command to push out the drive...
However if i try pfexec eject it works....but then again it works only when the system is completely up and running not at some intermittent stage in the boot process.

How do i change the my id to a Superuser then execute the eject command ,then once the eject is done with, i would like to revert back to the ordinary user?
Secondly this code should be incorporated into one of the boot scripts,
So that after a certain stage during the boot, the drive automatically ejects......

How do i do it.....

PS:i urge you to consider that ejecting the media on a livecd is possible.

Thanks
# 2  
You can try using sudo with the eject command , without password.sudo works like a charm!
# 3  
put the user that should change to superuser into the /etc/sudoers file.
then run sudo with the --preserve-environment flag so you can use your varibales that you set under the first user also in the superuser. then exit from su mode with exit Smilie
# 4  
i am using a flavor of solaris...
There is no command called sudo..
If i have to enter as super user then i will use
su - <account name>
will take you to the subsequent account

But i did look up the man pages and found a way out!!!
bash 3.2$: su - root -c eject
password: ******
<i am able to eject the drive>
bash3.2$:

and so i return back to default user...... Smilie
so all my queries are solved...
However i am curious to know, since i have provided for a password, the system will ask for a passwd conformation...
But if dont ,then will it just skip the passwd thing, and proceed with ejecting??

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #742
Difficulty: Medium
XL Fortran is the name of an open source Fortran compiler for IBM-supported environments, including Linux for big-endian distributions and AIX.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Change user passwords using shell script

Hi, I want to change the password of unix users on a number of servers.My plan was to ssh to all the servers in a shell script and use the passwd command. I tried to do so but everytime i run it i get this error. ssh -x -n -l user1 host passwd Changing password for "user1" 3004-709 Error... (3 Replies)
Discussion started by: poojabhat
3 Replies

2. Shell Programming and Scripting

Shell Script to change a user password using script

Hi Experts, I had tried to executes this script to change the user password through script: No lines in buffer #!/bin/ksh cat /etc/passwd | grep -v userid >> /tmp/pass.tmp1 cat /etc/passwd | grep userid >> /tmp/pass.tmp2 PASS1=`cat /tmp/pass.tmp2 | cut -d ":" -f2` PASS2=`q2w3e4r5` sed... (3 Replies)
Discussion started by: indrajit_renu
3 Replies

3. Shell Programming and Scripting

root user command in shell script execute as normal user

Hi All I have written one shell script for GPRS route add is given below named GPRSRouteSet.sh URL="www.google.com" VBURL="10.5.2.211" echo "Setting route for $URL for GPRS" URL_Address=`nslookup $URL|grep Address:|grep -v "#"|awk -F " " '{print $2}'|head -1` echo "Executing ... (3 Replies)
Discussion started by: mnmonu
3 Replies

4. UNIX for Dummies Questions & Answers

How to give an ordinary user the superuser (root) ID which is 0

How to give an ordinary user the superuser (root) ID which is 0 (9 Replies)
Discussion started by: sharaola
9 Replies

5. Linux

grant root privileges to ordinary user

Hi, Is it possible to grant root privileges to an ordinary user? Other than 'sudo', is there some way under Users/Groups configuration? I want ordinary user to be able to mount, umount and use command mt. /Brendan (4 Replies)
Discussion started by: brendan76
4 Replies

6. Shell Programming and Scripting

Script using awk works only as super user

hi friends, I am a new Sun Solaris 10 user. I have the following script line=$(awk '{if(substr($0,1,1)!="#" && substr($0,1,1)!=";" && substr($0,1,1)!=" " && substr($0,1,1)!="/" && substr($0,1,1)!="*" && substr($0,1,1)!="\\" && length($0)!=0) ... (10 Replies)
Discussion started by: gjithin
10 Replies

7. Solaris

Sunsolaris shell script runs only as super user

Hi Friends, I am new to Sun solaris unix.I am facing problem while runing my kornshell script just as an ordinary user.The script works fine while i am working as a super user.the script just uses awk to check the first charcter of a file and then copies the file to another folder. Do i... (4 Replies)
Discussion started by: gjithin
4 Replies

8. AIX

[Help] Give privilege to an ordinary user

I'm trying to give a non-root user the right to start IBM HTTP Server, the web server is listening on port 80, but for AIX, ports under 1024 are privilege ports which can be used only by root. /usr/IBMIHS/bin# ./apachectl start (13)Permission denied: make_sock: could not bind to address :::80... (1 Reply)
Discussion started by: ibmer414
1 Replies

9. Shell Programming and Scripting

switching user from root to ordinary user

Good day Guys!!! I am currently making a script in AIX, the script runs a SAS job, the owner of the script is the root, but the SAS jobs cannot be run by the root, as it should be run by a user 'sasia'. But inside the script, root creates a logfile, so what I need is just to su to sasia for the... (3 Replies)
Discussion started by: sasia
3 Replies

10. UNIX for Dummies Questions & Answers

change user through shell script

hi, my problem is that i am calling a script from my perl program. the script checks wether a particular process is running or not if the process is not running then it should start the process. the problem here is that the front end logs into backend with a user which does not have the... (0 Replies)
Discussion started by: raviraushanjha
0 Replies

Featured Tech Videos