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Full Discussion: Bash script to change user
Top Forums Shell Programming and Scripting Bash script to change user Post 303045685 by Ann157 on Wednesday 8th of April 2020 11:21:55 AM
Old 04-08-2020
Bash script to change user

So, I need to write bash file that will
1) get name of the user you want to switch to
2) check if there is such user
3) check length of entered name of user
4) and change user
My script looks like this
read $user_name
if ( ! [[ $(cat /etc/passwd | grep $user_name) ]] ) then echo "error. There is no such user" exit 1 fi
if (( $(expr length $user_name) >= 30 ))
then echo "error" exit 1 fi
sudo su $user_name 
exit 0

But if I enter existing user it shows error message
Where is my mistake?

Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 04-08-2020 at 01:20 PM.. Reason: code tags, please!

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chsh(1) 						      General Commands Manual							   chsh(1)

chsh - change login shell SYNOPSIS
chsh [-D binddn] [-P path] [-s shell] [-l] [-q] [-u] [-v] [user] DESCRIPTION
chsh is used to change the user login shell. A normal user may only change the login shell for their own account, the super user may change the login shell for any account. If a shell is not given on the command line, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new value to change the field, or leave the line blank to use the current value. Enter none to remove the current value. The current value is displayed between a pair of [ ] marks. The only restrictions placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the super- user, and then any value may be added. An account with a restricted login shell may not change their login shell. This version of chsh is able to change the shell of local, NIS, NIS+ and LDAP accounts , if the permissions allow it. OPTIONS
-D, --binddn binddn Use the Distinguished Name binddn to bind to the LDAP directory. The user will be prompted for a password for simple authentica- tion. -P, --path path The passwd file is located below the specified directory path. chsh will use this files, not /etc/passwd. This is useful for exam- ple on NIS master servers, where you do not want to give all users in the NIS database automatic access to your NIS server and the NIS map is build from special files. -s, --shell Specify your login shell. -l, --list-shells Print the list of shells listed in /etc/shells and exit. -q, --quite Don't be verbose. -u, --usage Print a usage message and exit. --help Print a more verbose help text and exit. -v, --version Print version information and exit. FILES
/etc/passwd - user account information /etc/shells - list of valid login shells SEE ALSO
chfn(1), passwd(5), shells(5) AUTHOR
Thorsten Kukuk <kukuk@suse.de> pwdutils February 2004 chsh(1)

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