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calculating the time difference, when the script was executed and the currenent file

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Top Forums Shell Programming and Scripting calculating the time difference, when the script was executed and the currenent file
# 8  
Old 07-16-2008
If accuracy (to one minute) is not important you could run a cron every minute which maintains a file which is at least 5 minutes old.
There will be little performance impact but make sure you have enough disc space for 4320 (24 * 60 *3) extra lines in your cron log per day.

#!/bin/ksh
# 5minsago.sh Maintain file called 5minsago
# Run from cron every minute. Effective after 6 mins.
#
cd /var/tmp
mv 4minsago 5minsago 2>/dev/null
mv 3minsago 4minsago 2>/dev/null
mv 2minsago 3minsago 2>/dev/null
mv 1minsago 2minsago 2>/dev/null
mv 0minsago 1minsago 2>/dev/null
touch 0minsago


Then in the script called by your automation program:
find <dir> ! -newer /var/tmp/5minsago -print|while read OLDALERTFILE
do
<process the old files>
done



If accuracy is important you need a "C" program.

ps. I've avoided posting a shell script to subtract 5 mins from the current time because such a script is very long.
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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)