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Full Discussion: Cron jobs and mail
Top Forums Shell Programming and Scripting Cron jobs and mail Post 302454394 by ocramas on Saturday 18th of September 2010 12:16:06 AM
Old 09-18-2010
Hi Thelak,

Look, first of all, we're talking about "cron" jobs, alright ! ...

Look, the tasks that you need to perform could be done inside a script, so you prepare a script with the tasks that you want and just set up the cron to execute them every hour, in this case .

1- Access your crontab with the following command
# crontab -e
(it is an empty file, you have to edit here what you need, the editor could be "vi")

2- Then add the following line.

0 * * * * /{path to your script}

---The 0 * * * * represents hourly, so the script will be processed every hour.

NOW, regarding the other points, look.

1- the mail!!!, use mailx ... I will show you how to do it soon
2- use find to "find" the large files, first, you have to define what is large for you.

eg. Find files greater then 5 megs (in bytes)

# find / -size +5000000c -exec ls -ltr {} \; --> this will show you the files, you have to refine this part to make it work with the file sizes that you really want.

OK... I will try to recreate what you are looking for.


Find the large files and compress them, let's say, files greater than 1GB ---- be carefull with this, you don't want to this with the OS files, etc.

Code:
find /tmp/files_to_shrink -size +1000000000c > /tmp/list_of_files

--- to see them
you can send this file to your email like this.

Code:
/tmp/list_of_files | mailx -s "files to compress" email@domain.com

If the file is ok, you can run a little script to read all that file, line per line, compress the files, then remove the files.

Hope that helps,

Marco,
This User Gave Thanks to ocramas For This Post:
 

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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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