Shell Programming and Scripting

guys.. i currently use this logic to calculate date and time.

Code:

export day=`date +%d`
export month=`date +%m`
export day_len=${#day}
export mon_len=${#month}
export hr_min=0000
if [[ $day_len -lt 2 ]] || [[ $mon_len -lt 2 ]] 
then
   month=0$month
   day=0$day   
   export time_search=$month$day$hr_min
else 
   export time_search=$month$day$hr_min
fi

this basically sets the date and time to 12 midnight each day. I basically use this to set up a grep command like this

Code:

touch  -t $time_search dummy
       ecust_time_stamp=$(find .  -name 'eCustomerCME*' -newer dummy  -type f  -exec ls -ltr {} \; | tail -1 | awk ' { print $6,$7,$8 } ')

I want my $time_search variable to be set (currrent time - 2 hrs) each time the grep statement is executed as a part of the code. Can you please suggest me how to do this.

Thanks in advance.

sample script:

date
TZ=GMT+3 date
TZ=GMT-6 date
TZ=GMT+9 date
TZ=GMT-12 date


Output:

Mon Jan 22 16:32:27 CET 2007
Mon Jan 22 12:32:27 GMT 2007
Mon Jan 22 21:32:27 GMT 2007
Mon Jan 22 06:32:27 GMT 2007
Tue Jan 23 03:32:27 GMT 2007


Proper value for TZ=....... depends on your timezone

thanks for the reply. i want my output to ne like this

date = 23
month = 01
hr = 08
minutes = 46.

i will have to modify my code to get (current time - 2hrs).

thanks

The touch command will assume the current year unless you specify it. So your script will fail in the first hours of a year. The full timestamp for touch is yyyymmddhhmm.ss and it is no problem to specify the whole thing. Recall that 2 hours is 7200 seconds. With perl you can get the stampstamp of two hours ago like this:
$ perl -e '@d=localtime time()-7200; printf "%4d%02d%02d%02d%02d.%02d\n", $d[5]+1900,$d[4]+1,$d[3],$d[2],$d[1],$d[0]'
200701220915.14
$

Sample script:

TIME_SEARCH=`TZ=GMT+3 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT-6 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT+9 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT-12 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT+15 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT-18 date +%m%d%H%M`
echo $TIME_SEARCH
TIME_SEARCH=`TZ=GMT+21 date +%m%d%H%M`
echo $TIME_SEARCH

Output:

01221357
01222257
01220757
01230457
01220157
01231057
01211957

Thanks a lot fot your help guys. sb008.. i was able to do as you said.