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I want a script that checks the logins and logouts in a system.Is there a way to keep the logins and logouts in files and then compare them every e.g. 10 seconds?
for tcsh.

Anything for tcsh.thanks again

i want the user to give a parameter in seconds and every x seconds to check for any logins or logouts.if you have a better way to do this it is acceptable.
thanks

Is there a way to make a timer?
E.g Please give the seconds...
...

To make it clearer,i want the programe to be something like this.
Please give period in seconds.
100
i want every 100seconds to check if a user logged in or logged out.

Is there a command that counts the logged in users?
for tcsh

I want to check periodically, every "period" seconds given by the user ,if a user logged in or logged out of the system.If he did print a message with his name and his time of logging in or out.for...

is there anything for tcsh please?

I have a script that needs to check if the given parameters are a combination of 0123456789 and not a word or another irelevant character.please help