unable to chage the date format

Shell Programming and Scripting
1

Hi All,
I want chage the date value YYMM to YYYYMM in my script.
I am trying, but not get it.

Eg: 1109 changed to 201109.

$(if [[ $ARCHIVE_DT == "." ]] then
  echo "1"
else
  echo "update_month<=$ARCHIVE_DT"
fi)

Through above i got "update_month<=1109" in else, but i must get it "update_month<=201109"

Please help me in this

Thanking in advance.....

Regards.
dathu

2

Have you tried something like this:

ARCHIVE_DT="1109"
if (( ${#ARCHIVE_DT} < 6 ))
then
  ARCHIVE_DT="20$ARCHIVE_DT"
fi
echo "new date: $ARCHIVE_DT"

This will add 20 to the front of the date if it is not already 6 characters long. Works in Kshell and should work in bash.

3 
temp=$ARCHIVE_DT
if [[ $temp < 2000 ]]; then 
  ARCHIVE_DT=20$temp
else
  ARCHIVE_DT=19$temp
fi

Here year range is 1920 to 2019...

4

Thanks for reply.
suppose ARCHIVE_DT value: 9910, but i didn't get 199910 through the above code

---------- Post updated at 07:56 PM ---------- Previous update was at 07:43 PM ----------

Thanks sinnud.
But this code is limited. My year value ranges to 1995 to 2099.
Please help me.

Thanks in advnce...

Regards,
Dathu

5

Then you need to decide, for example, 9610, to be 209610 or 199610. If you cannot decide, the script cannot...