Give previous date as argument to shell script

Question

I need to execute the script by passing previous date as command line argument. It must be automated. So, how can i pass the previous date to the script?

For example:

sh processFile.sh previousdate previousdate

Solution

With GNU date:

previousdate=$( date -d 'yesterday' +'%F' )
sh processFile.sh "$previousdate" "$previousdate"

With macOS date:

previousdate=$( date -j -v -1d +'%F' )
sh processFile.sh "$previousdate" "$previousdate"

Comments

[Kusalananda]

The correct answer may depend quite heavily on what type of Unix system this is for.