Help me create a Bash Script

rickricky · 04-01-2015, 12:32 AM

Hi all,

Can you guys create a script for me?

A script that will call a file name "userlist" and create user with /bin/false

take note: userlist has a list of names eg. mjordan, mjackson, hpotter, bobama.

if no file name is call it will show a error message saying "File needed"

if execute without any parameter it will display the name of the script.

newbie here in bash script

thanks!

lleb · 04-01-2015, 12:38 AM

sounds a lot like homework, please read the forum rules. not allowed.

on the other hand, if you post your efforts and any errors you are receiving via the CLI, we will be more then happy to point out issues and directions to resolve said issues.

https://www.google.com/search?source...i65l2.2954j0j7

rickricky · 04-01-2015, 12:48 AM

Hi lleb,

Thanks for the reply and helpful links.

it is not actually a homework. I already created some but seems not working so I just want to request some new fresh script if anyone can provide.

but its ok.

thanks

pan64 · 04-01-2015, 12:49 AM

I would suggest you to post what have you tried and fix that...

rickricky · 04-01-2015, 01:01 AM

here you go:
Sorry for my bad script

The part from which I don't know what to input is in useradd part.

#!/bin/bash
if [ $# -eq 0 ]; then
echo " $(basename $0) <userlist> | Create a user from a file"
exit
fi
case $1 in
userlist)
useradd -s /bin/false $1
exit
;;
*)
echo "File needed"
exit
;;
esac

pan64 · 04-01-2015, 01:09 AM

please use [code]here comes your code[/code] to keep formatting of your code
So $1 should be a file containing a list of users.
I would do something like this:

Code:

#!/bin/bash
if [ $# -eq 0 ]; then
echo " $(basename $0) <userlist> | Create a user from a file"
exit 1   
fi
userlist="$1" # here userlist is a variable and contains the name of the file you want to use
# check if that file exists
[[ -f "$userlist" ]] || { # in case of error (not found) print some message and exit 
    exit 1
}
# read that file and evaluate its content

Is this what you need?

rickricky · 04-01-2015, 01:46 AM

Yes Similar to that.

Also can you show me how to execute this script successfully?

I'm not sure of what to add to "add" the user from the file.

Thanks

pan64 · 04-01-2015, 02:04 AM

how did you execute your own script?
you need to read that file and add users line by line (or at least I think this is what you want). In that case you need to construct a while loop to do the job. You can get some tips here: http://www.linuxquestions.org/questi...y-line-136784/

lleb · 04-06-2015, 12:34 PM

you execute the file the same way you execute any file in linux.

chmod +x foo
./foo

will do the trick.