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Returns yesterday's date in the format yyyyMMdd
There are 3 alternatives - vote for the best!
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(gnu date) date -d yesterday +%Y%m%d
IMO this command makes no sense. It's too complicated and you will never keep this in mind. The solution of flipouk is the better one.
It is for systems which do not have gnu date, like my old solaris box.
As i said in the other post, and it certainly concerns this command too:
removing 86400 is not efficient at all when time change has happened around 86400 seconds earlier (depending on if it was +1h or -1h).
Do not rely on this command.