Shell Programming and Scripting

we made a script in which i am putting a day in a variable by this command
d8 = `date +%a`
after that I am checking for next working day meand week days only for eg.
if today is Monday than previous day would be Friday and
if today is Friday than next day is Monday else it would be date +1

I am getting error while using this 'if' condition whole using in ksh shell on AIX server having no date GNU Version
please help
if [$d8 = "Fri"]; then
d4 = `TZ=-72 date +%Y%m%d`
else
d4 = `TZ=-24 date +%Y%m%d`
fi

spaces are important in shell programming.

Firstly you should have no spaces on the assign so:

Code:

d8=`date +%a`

If statements need spaces on either side of [ and ] and it is best practice to put quotes around string variables in compares so:

Code:

if [ "$d8" = "Fri" ]; then