Code to retrieve the username and do some manipulation in linux system

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Code to retrieve list of users and do some manipulation

I'm novice to Linux, i need a snippet to

fetch the username from the user system in linux, the username must be the input.

I need to enter the username, if it is listed in the system, then it should display the username.

i got the command to list the existing user from the system

Otherwise it should throw the error.

Please advice me if missed out something.

Thanks in advance.

Posted 29-Jun-12 0:00am

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Sergey Alexandrovich Kryukov 29-Jun-12 14:49pm

Why? especially for a novice...
--SA

2 solutions

Solution 1

Just read the file "/etc/passwd". It only makes sense for the local host passwords stored in this file, not in some external database like LDAP. Normally, to get access to this file you need to have administrative account and run your application using this file via sudo (do you know about sudo, by the way? I mean: http://en.wikipedia.org/wiki/Sudo[^]).

—SA

Posted 29-Jun-12 8:52am

Sergey Alexandrovich Kryukov

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markkuk · Accepted Answer · 2012-07-01T11:47:00

Solution 2

Use the getpwnam() or getpwnam_r() functions. They work independently of the method used to store the user information. The manual page[^] has example code.

Posted 1-Jul-12 11:47am

markkuk