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Are there any command that will check file ????

 
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Top Forums UNIX for Dummies Questions & Answers Are there any command that will check file ????
# 1  
Old 12-30-2009
Are there any command that will check file ????
Hi all,

i will write a script. Script will sense certain directory and if a file is created it will send me an email.

i know how mail is sent. But i dont know which command that check directory for file is created or not continuously.

Thanx for your helping.

---------- Post updated at 04:19 AM ---------- Previous update was at 04:17 AM ----------

shortly, when someone created or send a file to certain directory my script have to send me a email.

---------- Post updated at 04:19 AM ---------- Previous update was at 04:19 AM ----------

how can i success this?
# 2  
Old 12-30-2009
If you can do perl programming, then take a look at file::monitor: File::Monitor - search.cpan.org
# 3  
Old 12-30-2009
You can check with test if a file exists; example:

Code:
[[ -e somefile ]] && echo ok

Can also include it into a if/then/fi of course, etc.

To have some repeating checks you might want to add it as a cron job.
For cron you might read up here:
https://www.unix.com/answers-frequent...n-crontab.html
# 4  
Old 12-30-2009
i know these ways, i curious are there any command?
Thanx.
i know two way:
1-i write "[[ -e somefile ]] && echo ok" sentence in a script and call it via cron per 1 minute
2- i write "[[ -e somefile ]] && echo ok" sentence in a scirpt and call it in while loop.
and there is "sleep 60" command in loop.

i had curioused are there any command(will run backgroun of OS) sense directory for file.

thanx
# 5  
Old 12-30-2009
i dont believe such a process is there in any OS.. why at all it is required, then it will become a resource intensive in a heavily used file servers.
# 6  
Old 12-30-2009
2 ways I firgured out to meet your needs:

1) check the stimestamp of the directory ( Because once a file created, the directory's modification time is necessarily updated ). Save the the last timestamp and compare the most recent one to it to see if the timestamp has been changed

2) Use checksum (cksum command)... briefly, compare old checksum of the contents of the directory with the new checksum if the there is a change. If yes, new file has been created in that dir.
The detailed code may look like this:

Quote:
old_cksum=`ls -a urdir|cksum`
while :;do
sleep 60 # check every minute
new_cksum=`ls -a urdir|cksum`
[ $old_cksum = $new_cksum ] || mailx ....
old_cksum=$new_cksum
done
 
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