Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

How to write bash script for creating user on multiple Linux hosts?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to write bash script for creating user on multiple Linux hosts?
# 15  
Old 02-20-2013
One way to avoid grief is to put everything in ', except ' itself and $varaibles and file globs. For $variable, you nip out of ' land and into " land for the variable and then go back to ' land. ' itself is '"'"' or '\'' file globs must be barefoot.
# 16  
Old 02-20-2013
Yes, that technique helps somewhat but I still end up reverting to trial and error more often than not.

Especially with awk which inexplicably seems to need odd numbers of backslash characters (3,5 or 7!) to get some complex REs working (and worse still it varies depending the expression being within // or "").
# 17  
Old 02-20-2013
Chubler

What is the reason of the escape(\) on $3 on the following option you suggested
Code:
RUID=`ssh $i  awk -F: '\$3=="'$UNIQUE'"' /etc/passwd`

Last edited by Franklin52; 02-21-2013 at 03:24 AM.. Reason: Please use code tags for data and code samples
# 18  
Old 02-20-2013
That stops the remote shell from expanding $3

Command starts as

Code:
ssh $i awk -F: '\$3=="'$UNIQUE'"' /etc/passwd`

The remote shell gets:

Code:
ssh $i awk -F: \$3=="2341" /etc/passwd

Awk sees:
Code:
$3==2341

So you can see the double quotes aren't really doing much and should probably also have backslash to protect them from the remote shell and pass them thru to awk (my intention was for awk to see $3="2341" but as UIDs are numeric this will still work)
Last edited by Chubler_XL; 02-20-2013 at 05:41 PM.. Reason: Typos
# 19  
Old 02-20-2013
That's why my optimized script above has
Code:
getent passwd $UNIQUE

# 20  
Old 02-20-2013
Funny I always associate getent with NIS, is it installed by default on most systems now?
# 21  
Old 02-20-2013
getent is available on Linux, Solaris, BSD.
Not HP-UX, don't know about AIX.

Like the p-tools (pgrep, pkill, ptree, pargs, pfiles, ...),
getent simplifies debugging and shell scripting.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Check connectivity with multiple hosts - BASH script available here

Hi everyone! Some time ago, I had to check connectivity with a big list of hosts, using different formats (protocol://server:port/path/, server:port, ....). I developed a script that checks the connectivity using different commands (ping, telnet, nc, curl). It worked for me so I'm sharing it... (9 Replies)
Discussion started by: Fr3dY
9 Replies

2. Shell Programming and Scripting

Bash script to detect nonpingable hosts

I have a script to detect if a host is pingable or not. The problem is that I would like it to put the nonpingable hosts in one file and the pingable hosts in another. I have come up with this so far: for ip in `cat /tmp/testlist2`; do ping -c 3 $ip >/dev/null && echo "$ip is up" || echo "$ip... (5 Replies)
Discussion started by: newbie2010
5 Replies

3. Shell Programming and Scripting

Running a script on multiple remote hosts at once

I have a script on about 15 hosts that I need to run for each host whenever I want (not crontab). Problem is, this script takes 5-10 mins to run for each host. Is there a way I can run the script in parallel for all the hosts instead of 1 at a time? Also, I'm remotely running the script on the... (3 Replies)
Discussion started by: mrskittles99
3 Replies

4. Shell Programming and Scripting

script to reboot multiple hosts

Hi Expert, How to create a script to reboot multiple hosts in linux? Thank you. (5 Replies)
Discussion started by: regmaster
5 Replies

5. SuSE

creating user on SUSE Linux

Hi I need to create a user who can have access on only one folder. for example I created a user "test" . he should have access only on folder /testfolder. The problem is that the user will mostly use FileZilla to ftp his files in the testfolder. In the fileZilla , i want him to be... (21 Replies)
Discussion started by: SystemEng
21 Replies

6. Shell Programming and Scripting

help needed with creating challenging bash script with creating directories

Hi, Can someone help me with creating a bash shell script. I need to create a script that gets a positive number n as an argument. The script must create n directories in the current directory with names like map_1, map_2 etcetera. Each directory must be contained within its predecessor. So... (7 Replies)
Discussion started by: I-1
7 Replies

7. Shell Programming and Scripting

How to write bash script to explode multiple zip files

I have a directory full of zip files. How would I write a bash script to enumerate all the zip files, remove the ".zip" from the file name, create a directory by that name and unzip each zip file into its corresponding directory? Thanks! Siegfried (3 Replies)
Discussion started by: siegfried
3 Replies

8. Shell Programming and Scripting

script for df output from multiple hosts

I am trying get "df -k" output from multiple hosts along with their hostnames via ssh, my script is appending the "df -k" output from all the nodes to a single file but not getting the hostnames for those nodes, just wondering how to pass more than one command via ssh or may be someone could come... (6 Replies)
Discussion started by: barkath
6 Replies

9. UNIX for Dummies Questions & Answers

[LINUX] Creating new user accounts

I've had Linux when I was young, on one of our first computers and learned it pretty quickly... However, I've been working on Windows for about 7 years now and just made the switch back to Linux, Mandrake 9.1. So I have some problem with creating new user accounts. I could create one, but once I... (3 Replies)
Discussion started by: Arendo
3 Replies

10. UNIX for Dummies Questions & Answers

Creating user ids on multiple systems simultaneously

I am trying to think of a way to create user ids on multiple Linux systems in one fell swoop without logging onto each system indivually. Is there a way to do this with ssh commands? I don't want to use NIS/LDAP solution just a simple shell script utilitarian methodoloy would suffice. Also, I am... (1 Reply)
Discussion started by: darthur
1 Replies
Login or Register to Ask a Question