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Full Discussion: Check if user exists shell
Top Forums Shell Programming and Scripting Check if user exists shell Post 302377087 by bib2006 on Thursday 3rd of December 2009 05:57:26 AM
Old 12-03-2009
Check if user exists shell

Hello!
I'm stuck with a problem that i can't solve. I'm very new to unix, linux and shell scripting i might add. I'm trying to create a script that will execute as follows:
First start the script - sh exist
Then the prompt asks the user to input a username to check if it exists within the system.
It then checks if the user exists or not.
If the user exist, it returns something like "The user exist" and if the user doesn't exitst it says "The user doesn't exist".
I have tried many different ways to solve this. And where i'm at now looks something like this:

Code:
#!/bin/sh
echo "Search user:"
dir="/home"
read typed
if
$typed -e $dir
echo "user exist!"
elif
echo "user deosn't exist"
fi

The dir="/home" i understand can be changed to the etc/passwd directory, right? The code complains at the -e command and doesn't like the if statements either. You skilled coders might think i'm stupit to have structured it this way, fell free to right me on this! Smilie
Maybe the "read" is completely wrong to use as well?

Thanks in advance!
 

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CHSH(1)                                                            User Commands                                                           CHSH(1)

NAME
chsh - change login shell SYNOPSIS
chsh [options] [LOGIN] DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account. OPTIONS
The options which apply to the chsh command are: -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -s, --shell SHELL The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell. If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks. NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser, and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value. FILES
/etc/passwd User account information. /etc/shells List of valid login shells. /etc/login.defs Shadow password suite configuration. SEE ALSO
chfn(1), login.defs(5), passwd(5). shadow-utils 4.5 01/25/2018 CHSH(1)
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