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Shell Programming and Scripting

Change Date Input :-

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# 1  
Old 04-06-2016
Change Date Input :-
I have Below Input :-

Code:
X1=03 ### Hour
Y1=20160405 ## Date
Z1=3 ## I want to Back 3 Hour

Output
Code:
List=03 02 01
Y1=20160405

Input:-

Code:
X1=02 ### Hour
Y1=20160405 ## Date
Z1=4 ## I want to Back 4 Hour

Output:-
Code:
List=02 01 24 23
Y1=20160404 ### Date Will Change

Moderator's Comments:
Mod Comment Please use code tags correctly!
Last edited by RudiC; 04-06-2016 at 11:59 AM.. Reason: Corrected code tags
# 2  
Old 04-06-2016
Any attempts/ideas/thoughts from your side?

And, be aware that switching back in dates can be seriously involved.
# 3  
Old 04-06-2016
HI

I am still Trying....
# 4  
Old 04-06-2016
shell approach:
Code:
. file             # source input file to set all variables
printf "List="; for ((i=0; i<Z1; i++)); do T=$(((23 + X1 - i) % 24 + 1)); [ $T = 24 ] && ((Y1--)); printf "%02d " $T; done; printf "\nY1=%s\n" $Y1
List=02 01 24 23 
Y1=20160404

# 5  
Old 04-06-2016
Thanks ...

Error :-

Code:
syntax error at line 12 : `((' unexpected

# 6  
Old 04-06-2016
How come that's somewhere near line 12?
What OS and shell version do you use?
# 7  
Old 04-06-2016
Solaris and Shell Script #ksh
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