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How to write the dates between 2 dates into a file

 
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# 1  
Old 06-19-2012
How to write the dates between 2 dates into a file
Hi All,

I am trying to print the dates that falls between 2 date variables into a file. Here is the example.

$BUS_DATE =20120616
$SUB_DATE=20120613

Output to file abc.txt should be : 20120613,20120614,120120615,20120616

Can you pls help me accomplish this in LINUX.

Thanks
Freddie
# 2  
Old 06-19-2012
This should be a piece of cake if you know perl...
# 3  
Old 06-19-2012
Hi Shamrock,

Our environment doesn't support PERL. Smilie

Is there a way we can accomplish this in LINUX coding

Thanks
Freddie
# 4  
Old 06-19-2012
If you have either GNU or AT&T AST's date command, then something like this is possible:

Code:
#!/usr/bin/env ksh

date1="20120601"
date2="20120614"

ndays=$(( ($(date -d $date2 "+%s") - $(date -d $date1 "+%s"))/ 86400 ))
fmt="%s"
for x in {0..$ndays}
do
    printf $fmt "$( date -d "$date1 + $x day" "+%Y%m%d" )"
    fmt=",%s"
done
printf "\n"

If you want to use bash (the {n..m} construct doesn't work in my version), then use this for statement:

Code:
for x in $( seq 0 $ndays)

Last edited by agama; 06-19-2012 at 09:55 PM.. Reason: typo
# 5  
Old 06-20-2012
Quote:
Originally Posted by dsfreddie
Hi Shamrock,

Our environment doesn't support PERL. Smilie
You mean perl isnt installed...there is a big difference between not installed and not supported and i think there isnt a linux distro that doesnt support perl...talk to your sysadmin and [s]he can install perl for you.
Quote:
Originally Posted by dsfreddie
Is there a way we can accomplish this in LINUX coding

Thanks
Freddie
What Linux distro are you running...as the date command on linux systems is very powerful unlike the one on older unix systems.
# 6  
Old 06-20-2012
Using ksh93
Code:
date1="20120601"
date2="20120614"

u1=$(printf "%(%s)T" "${date1:0:4}-${date1:4:2}-${date1:6:2}")
u2=$(printf "%(%s)T" "${date2:0:4}-${date2:4:2}-${date2:6:2}")

fmt=""
while (( u1 < u2 ))
do
    printf "%s%(%Y%m%d)T" "$fmt" "#$u1"
    (( u1 += 3600*24 ))
    fmt=", "
done
printf "\n"

 
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