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Difference in these UNIX commands

This is a discussion on Difference in these UNIX commands within the Unix/Linux forums, part of the Operating Systems category; Can someone tell me the difference between these commands namely? ctermid(), ttyname(), cuserid(), getlogin()...

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#1 (permalink)   06-24-2006

RyanJames Expert Member   Join Date: May 2006 Location: New York, USA Posts: 118 Thanks: 0 Thanked 6 Times in 4 Posts

Difference in these UNIX commands Can someone tell me the difference between these commands namely? ctermid(), ttyname(), cuserid(), getlogin()

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#2 (permalink)   06-24-2006

fred Contributing Member   Join Date: May 2006 Posts: 79 Thanks: 0 Thanked 5 Times in 4 Posts

Re: Difference in these UNIX commands The ctermid() function generates a string that, when used as a pathname, refers to the current controlling terminal for the current process.

#3 (permalink)   06-24-2006

timmy Contributing Member   Join Date: May 2006 Posts: 84 Thanks: 0 Thanked 9 Times in 6 Posts

Re: Difference in these UNIX commands ttyname() - This returns name of a terminal. cuserid() - This get character login name of the user getlogin() - This returns a pointer to a string containing the user name associated by the login activity with the controlling terminal of the current process

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#4 (permalink)   06-24-2006

norman Contributing Member   Join Date: May 2006 Posts: 88 Thanks: 0 Thanked 10 Times in 9 Posts

Re: Difference in these UNIX commands Interesting to learn!!!! The associated header files for each are given below: ctermid() - stdio.h ttyname() - unistd.h cuserid() - stdio.h getlogin() - unistd.h

#5 (permalink)   07-12-2006

janelyn Contributing Member   Join Date: May 2006 Posts: 66 Thanks: 1 Thanked 5 Times in 4 Posts

Re: Difference in these UNIX commands The syntax for cuserid() is #include char *cuserid(char *t); The function cuserid() gives the user id associated with the process. The interesting part is in the return values of this function cuserid() namely If t is not a null pointer but if the associated login id or name could not be found then *t is placed with '\0' which denotes a null byte. If t is a null pointer and if the associated login id or name could not be found then return value from this function is a null pointer If t is a null pointer and if the associated login id or name can be found then return value from this function is the address of the storage area which has the corresponding login id or the username of the process.

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