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# 8  
Old 02-09-2015
Dears

kindly , thank you very much for both of you, I am very happy to see the prompt reply from you. today I registered in this website am sure it wont make me regret ...I am new in ksh scripting that is why I wanted to write script to add X number with date for example
20140129 +9 days the result will be 20140207 I saw it difficult because as it has been mentioned by Mr. Don i should consider normal year,leap year and we have 12 months but march is only 28 days i hope my comment is clear to you thanks again ...currently I am using software called admin ksh for windows because i have windows operating system.

---------- Post updated at 02:38 PM ---------- Previous update was at 02:28 PM ----------

Hello Ravinder,

after your posted link i found below i my required script but i dont understand it very well
Code:
cat script.ksh
echo $1 | awk -vs1="01" -vs2="03" -vs3="12" '{
                                                if(length($0)>8){
                                                                        print "Wrong Input!!";
                                                                        exit
                                                                }
                                                YEAR=substr($0,1,4);
                                                YEAR+0;
                                                MONTH=substr($0,5,2);
                                                MONTH+0;
                                                DATE=substr($0,7,2);
                                                DATE+0;
                                                split("31 29 31 30 31 30 31 31 30 31 30 31", W," ");
                                                if(DATE==s1 && MONTH==s1){
                                                                                YEAR=YEAR-1;
                                                                                MONTH=12;
                                                                                DATE=31;
                                                                                print YEAR MONTH DATE
                                                                         }
                                                else if(DATE==s1 && MONTH >= s1 && MONTH <= s3){
                                                                                MONTH=MONTH-1;
                                                                                W[2]=(YEAR%4!=0)?28:29;
                                                                                print YEAR MONTH W[MONTH]
                                                                                                }
                                                else {
                                                                                DATE=DATE-1;
                                                                                printf("%04d%02d%02d\n", YEAR, MONTH, DATE);
                                                     }
                                              }'

# 9  
Old 02-09-2015
I can't comment on "admin ksh for windows", but above script doesn't have anything to do with ksh. It is pure awk for subtracting one day from the input supplied. It takes into account crossing New Year, and, partly, leap years plus some error checking. It does not add any number of days nor subtract more than one day.
Still it can serve as a starting point for your work on a ksh script to achieve what you want.

And, please be clear what you want - ksh (as in the title) or awk (as in post #1)?
Last edited by RudiC; 02-09-2015 at 09:46 AM..
# 10  
Old 02-12-2015
Dear RudiC,

kindly , I want script to calculate date that is all more detail when you have 20150129 + 10 days the result will be 20150208. if you can provide me a script for that thank you very much.
# 11  
Old 02-12-2015
Hello shaho87,

This is a forum, a place where we all are here to learn from each other. I have posted my script previously in POST#6 and requested you to try something with it, could you please try something with that script and let us know the issues/queries you face so that we can help you in that. By this way we can learn more and help more to each other which is the main aim of this forum. We all are open to do mistakes(consider my stetement in dev/testing/personal environments only) and learn from them, there is a famous quote for same.
Quote:
Doing miskate first time is not a mistake, but NOT learning from mistakes is a BIG mistake.
Hope this helps.

Thanks,
R. Singh
# 12  
Old 02-15-2015
Hello all

could you please some one explain below for me? thanks
Code:
_std_input_str=`dd count=$CONTENT_LENGTH bs=1 2> /dev/null`"&"
eval $(echo $_std_input_str |awk -F"&" '{for (i=1;i<NF;i++) print $i}')

Last edited by vbe; 02-15-2015 at 04:16 PM.. Reason: code tags
# 13  
Old 02-16-2015
Please open a new thread for a new request!

Above snippet looks strange with no context set.
It assigns $CONTENT_LENGTH bytes read from stdin plus a "&" char to the variable, wherever stdin is redirected to.
Then, assuming a field separator "&", it splits that text's fields into single line words, and executes those words using eval (pls be aware that using eval is deprecated as is may turn out to be dangerous).

So, curtly, it executes every word read from stdin, regardsless of its possible damage to your system.
# 14  
Old 02-16-2015
Quote:
Originally Posted by RudiC
... ... ... and executes those words using eval (pls be aware that using eval is deprecated as is may turn out to be dangerous).

... ... ...
The eval command has not been deprecated in the standards. It is still a mandatory special built-in utility in the shell in shells conforming to the POSIX standards and the Single UNIX Specifications.

However, I agree that it needs to be used judiciously. In general, eval should not be used to evaluate (or execute) user supplied strings.
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