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Top Forums Shell Programming and Scripting How to send mail at specific calculated time interval? Post 302998622 by rbatte1 on Monday 5th of June 2017 06:19:52 AM
Old 06-05-2017
Is your script going to loop forever? (presumably pausing so you don't murder the CPU)

If so, then you should simply assign the value of $curr_date to mail_date when you send a mail.

Rather than forgetting about it altogether, I would still write the file and move the line read mail_date < prev_mail_sent.txt to before the loop so that you read in a sensible starting value and if you script terminates for some reason (intentionally or otherwise) then when you start it up again, it will know where to pick up from.

An alternate to a loop might be to schedule the script every minute as a run-through-once process that stores the value in a file. If the script as a whole might take quite a while to run (depending on what other processing you are doing within it) then you might need to ensure you don't run it twice at the same time. There are various mechanisms for doing that if you need them. Let us know if you want help with these and I'm sure someone can work with you.



Robin
 

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MAIL(1) 						      General Commands Manual							   MAIL(1)

NAME
mail - send and receive electronic mail SYNOPSIS
mail [-dpqrv] [-f file] [user] OPTIONS
-d Force use of the shell variable MAILER -f Use file instead of /usr/spool/mail/user as mailbox -p Print all mail and then exit -q Quit program if SIGINT received -r Reverse print order, i.e., print oldest first -v Verbose mode EXAMPLES
mail ast # Send a message to ast mail # Read your mail DESCRIPTION
Mail is an extremely simple electronic mail program. It can be used to send or receive email on a single MINIX system, in which case it functions as user agent and local delivery agent. If the flag MAILER is defined in mail.c, it can also call a transport agent to handle remote mail as well. No such agent is supplied with MINIX. When called by user with no arguments, it examines the mailbox /usr/spool/mail/user, prints one message (depending on the -r flag), and waits for one of the following commands: <newline> Go to the next message - Print the previous message !command Fork off a shell and execute command CTRL-D Update the mailbox and quit (same as q) d Delete the current message and go to the next one q Update the mailbox and quit (same as CTRL-D) p Print the current message again s [file] Save message in the named file x Exit without updating the mailbox To send mail, the program is called with the name of the recipient as an argument. The mail is sent, along with a postmark line containing the date. For local delivery, a file named after the recipient in the directory /usr/spool/mail must be writable. If the directory /usr/spool/mail does not exist then the mail is dumped on the console, so that system programs have a way to notify a user on a system that does not have a mail spool. MAIL(1)
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