Hello

Iam scheduling one script which takes a previous month as a argument like..

Iam running on 22nd of Mar then it will take

Sh test.sh -f 02 2014

for if iam running on 22 April then

sh test.sh -f 03 2014

How to get the previous month number through command iam doing for the curret month iam using like..

sh test.sh -f fuelevts_fdm `date '+%m'` `d ate '+%Y'` but for previous month

Any Expert a tricky code.

Note: Flaour is AIX.

I would suggest doing the conversion to last month inside the test.sh script. Keep in mind you must decrement the year if the current month is January.

# For example, with command line: sh test.sh -f fuelevts_fdm `date '+%m'` `date '+%Y'`
# read in command line args into vars $MONTH and $YEAR:
[ "$3" ] && MONTH="$3"
[ "$4" ] && YEAR="$4"

# You could then set initial values for MONTH and YEAR, if none were given on command line:
[ "$MONTH" ] || MONTH=`date '+%m'`
[ "$YEAR" ] || YEAR=`date '+%Y'`

# Now calc last month and year, if required.
if [ "$MONTH" = "01" ]; then # January is the only special case.
MONTH=12
(( YEAR = $YEAR - 1 ))
# I am not sure the (( .. )) works in AIX, but if it doesn't, this will:
# YEAR=`expr $YEAR - 1`
else
(( MONTH = $MONTH - 1 ))
# MONTH=`expr $MONTH - 1`
[ "$MONTH" -lt 10 ] && MONTH="0$MONTH" # Pad the month with a zero, for consistency with date command.
fi
echo "Month=$MONTH, Year=$YEAR"

Many implementations of the date command allow you to specify a date to use, not sure about AIX but you could try:

Which should return the last month based on the current date.

Thanks all, The first is the most sbvious solution for this problem

AIX doesnt have capabilty to execute date -d.

Moved: This thread is more suitable in AIX forum and has been moved accordingly to help your thread/question get the exposure it deserves.

When installing GNU coreutils, be careful not to overwrite the original programs. For example, install GNU-date as /usr/local/bin/date, and also make a symlink to it: ln -sf date /usr/local/bin/gdate, then call it:

If you don't want to install GNU date you can cheat and not do any date math by just taking the numerical month from 'date' and subtracting 1. Then you just test for and change 0->12 so it will properly wrap on January.

This works in ksh93; I didn't test it on my work boxes but it should work fine on the stock korn shell AIX ships with.

Using Bourne shell and a single math expression to manage January to December transformation, you can try something like this: