Date problem

Richienz

I have a requirement to echo a date range from the unix command line.
My requirement is as follows:

Start_date=20050901
end_date= 20050907

What I want to do is start from "start_date" and echo a filename "filexyz_20050901", "filexyz20050902"..... "filexyz_20050907"

so effectively in this example, I would want to do 7 echo commands...

Is it possible to do this in one unix command, or do I need a script?

Many thanks in anticipation

Richie

krinDar

Great big durty hack number one that will work in bash and ksh:

 i=$Start_date 

while (( i <= end_date )); do echo "filexyz_${i}"; i=$((i + 1)); done

This doesn't handle a month roll over however...

krinDar

krinDar wrote:

This doesn't handle a month roll over however...

This one does ... And year roll over, and isn't bothered by leap years...

#!/bin/bash

SD_year=${1:0:4}
SD_month=$((10#${1:4:2}))
SD_day=$((10#${1:6:2}))

ED_year=${2:0:4}
ED_month=$((10#${2:4:2}))
ED_day=$((10#${2:6:2}))

while (( SD_year < ED_year || 
        (SD_year == ED_year && SD_month < ED_month) || 
        SD_year == ED_year && SD_month == ED_month && SD_day <= ED_day ))
do
        printf "filexyz_%4.4d%2.2d%2.2d\n" ${SD_year} ${SD_month} ${SD_day}

        # Get days in month
        ndim=$(cal $SD_month $SD_year | awk '/^[0-9]+/{line=$NF}END{print line}')

        # If at the end of the month, increment, if at month twelve, 
        # increment year
        if (( SD_day == ndim))
        then
                if (( SD_month == 12 ))
                then
                        SD_month=1;
                        SD_year=$((SD_year+1))
                else
                        SD_month=$(( SD_month+1))
                fi
                SD_day=1;
        else
                SD_day=$(( SD_day+1))
        fi
done

Stick it into a file, set the permissions to executeable and run it as follows
assuming you put it into a file called script.sh:

$ ./script.sh 20050901 20050904
filexyz_20050901
filexyz_20050902
filexyz_20050903
filexyz_20050904

This requires bash, at least version 2.05.