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Full Discussion: Create user if UID not exist; else, exit the script
Top Forums Shell Programming and Scripting Create user if UID not exist; else, exit the script Post 302742989 by dirkaulo on Wednesday 12th of December 2012 02:32:13 AM
Old 12-12-2012
Create user if UID not exist; else, exit the script
Hi, I want to write a script to check whether an user ID is used in my server and then create that user.

If the user ID is not used, I will echo something like "OK, continue" and then continue to execute the script. Else, I will echo something like "Used, exit" and then exit the script.

As my system only have around 10 users, using grep and awk the /etc/passwd, I can check whether the UID is used. But in the shell script, when I want to
cat /etc/passwd | grep 'UID' | awk $3 and save the result to a variable, I can't do so.

Do anyone have idea on how can I write this shell script? I have no idea now since I can't save the "cat /etc/passwd" to a variable.
 

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LEARN ABOUT OSF1

script

script(1)						      General Commands Manual							 script(1)

NAME

       script - Makes a transcript of terminal session

SYNOPSIS

       script [-a] [file]

       The script command makes a transcript of everything printed on your terminal.

OPTIONS

       Appends the transcript to file rather than writing it to file.

OPERANDS

       The name of an output file that will contain the transcript of the session.  If this parameter is omitted, the file typescript is written.

DESCRIPTION

       The transcript is written to file, or appended to file if the -a option is given.  If no file name is given, the transcript is saved in the
       file typescript.

       The script ends when the forked shell exits.

       This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create	an
       example of a working session this way).

       If you specify the -a option and the file does not exist, it is created.

       If you do not specify the -a option and the file exists, it is replaced.

RESTRICTIONS

       The  script command requires a streams based terminal.  In single user mode, streams may not be enabled.  Under these circumstances, script
       will exit with no action.  If you are the superuser and need to run this command in single user mode, use the  following  special  instruc-
       tions.

   Enabling Streams
       If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams.  This command is avail-
       able to the superuser only.

SEE ALSO

       Commands:  autopush(8), cat(1), echo(1), strsetup(8), tee(1)

       System Administration

																	 script(1)
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