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Not a discovery but a useful one nontheless.
In the above example date format is 'yyyymmdd'. For other possible formats see 'man date'.
This command can be also very convenient when aliased to some meaningful name:
alias mkdd='mkdir $(date +%Y%m%d)'
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Thanks, but just give the actual command and not an alias.
It doesn't hurt to give the alias. Who really wants to type 'mkdir $(date +%Y%m%d)' repeatedly? Some people don't even know about aliases, so consider this one a two-for-one special.
And guess what will happen when they try to run that command when they don't know about aliases -- absolutely nothing. There are those who just want a copy/paste solution and don't care how things work. Sad, but true.
All above is true enough and both sides have their points. I'm changing entry to mkdir alone and describing alias in the comment. Should be satisfactory for all.
Tell me please what do you think about that.
Sorry for replying so late!