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1 Hour less

 
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# 1  
Old 05-12-2006
Data 1 Hour less
set DAY=`date +%y%m%d`
set H=`date +%H`
set M=`date +%M`

mailx -s "$H-Mydata" myemail@mail.com<mydata

I am looking to set the current hour to have 1 hour less in the subject header:

For example: let's say the system time is 8

I want to have "7-Mydata" not "8-Mydata"

Can some1 helps?

Many thanks!
# 2  
Old 05-12-2006
Go into the FAQ and look for datecalc - Perderabo wrote a script to handle time/date arithmetic.
# 3  
Old 05-14-2006
let HOUR=$(date +%H)-1
echo ${HOUR}

Works in korn and bash
# 4  
Old 05-14-2006
Quote:
Originally Posted by System Shock
let HOUR=$(date +%H)-1
echo ${HOUR}

Works in korn and bash
What happens if it is midnight? Would't the HOUR get set to -1?
# 5  
Old 05-14-2006
Quote:
Originally Posted by blowtorch
What happens if it is midnight? Would't the HOUR get set to -1?
Good question Smilie
Pesky 00's

if (( $(date +%H) < 1 )); then
HOUR=23
else
let HOUR=$(date +%H)-1
fi
# 6  
Old 05-15-2006
Data what will the syntax be if I am in:
#!/usr/bin/csh

Thanks!
# 7  
Old 05-16-2006
Something like this probably.
Code:
#!/bin/csh

if( `date +%H` < 1 ) then
        set HOUR=23
else
        set HOUR=`date +%H`
        set HOUR=`expr $HOUR - 1`
endif
echo $HOUR

But this may not be as elegant of efficient as it should be. I'm no csh scripter.
 
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