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need help with the watchmail command

Posted on 2009-04-05
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Last Modified: 2012-05-06
Hey, I need to implement a watchmail command in a shell, what its supposed to do is take a file name as an argument and beep if its size changes... I was thinking it could be done with a read file command and storing the number of bytes and check if it changes like that, is it that simple or a bit more complicated?
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Question by:errang
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9 Comments
 
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Expert Comment

by:Infinity08
ID: 24070537
You can't simply depend on the file size changing ... What if a byte was simply overwritten (ie. not added or removed) ?

The most direct way to do that would be to hook into the system file operation calls, but that's rather complicated, and probably not what you'd like.

A good alternative however, is to watch the file modification timestamp, and see whether that changes.
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by:errang
ID: 24070602
oh sweet... there's no built in command for that.. is there?
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by:Infinity08
ID: 24070820
What do you mean by a built-in command ? For doing what ?
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Author Comment

by:errang
ID: 24070834
a built in command to get the time stamp, or do I just need to have the shell list everything about the file and parse the time stamp from that?
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Infinity08 earned 500 total points
ID: 24070870
You can use the stat function for that :

        http://linux.die.net/man/2/stat
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Author Closing Comment

by:errang
ID: 31566713
Thanks, that function was not the first choice on my list... lol.
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Expert Comment

by:Infinity08
ID: 24072281
>> that function was not the first choice on my list... lol.

Why not ? Were you looking for something else ?
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Author Comment

by:errang
ID: 24072290
no no... I thought I would have to use a file listing command, and somehow parse it... this was way better =D
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Expert Comment

by:Infinity08
ID: 24072308
Heh. That's for sure - especially since the parsing would have to deal with possibly different output formats on different systems.
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