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05-04-2007
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File date vs Current date
I am a newbie in shell scripting, hope you can advice how can I compare the date/time of file extracted from 'll' and current system date/time.
I have done the following: ll -rt > $FILE_AGE_LOG FILE_DATETIME=`more $FILE_AGE_LOG | head -02 | cut -c 45-57` It returns 'May 4 19:11'. If I want to put in a condition to check if the file is more than 15 minutes old, something like the following. if [ $FILE_DATETIME < (`date`-15) ] Please kindly advice how can I do that? Thanks. 
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05-04-2007
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Trexlim,
A true date calculation can be very involved as you have to consider leap years. One way to solve your problem is: 1) One time only, create a "15_minutes_file". 2) Create a cron job that runs every 15 minutes. 2.a) Test if the file is older than 15_minutes_file -- "if file -ot 15_minutes_file" 2.a.I) Meets your criteria. 2.b) Update (touch) the "15_minutes_file" file with the current date. See if this works for you.
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05-04-2007
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try something like this:
Code:
#!/bin/ksh
# tdiff.sh
tdiff()
{
perl -e '
($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,$blksize,$blocks) = stat("$ARGV[0]");
$difference = time - $mtime;
print $difference;
' "$1"
}
secs=$(tdiff "$1")
minutes=$secs/60
if [[ $minutes -le 15 ]] ; then
echo "$1 is 15 minutes old or less"
else
echo "$1 is older than 15 minutes"
fi
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05-04-2007
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Following on with Shell Life
You could after touching the 'timestamp' file, do
'ls -ltr' and see what files are listed after the datestamp file. Note that the granularity of the list may only be to the nearest minute.
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05-04-2007
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