Super simple: A collection of shells that output dates

It's simple, but I always forget it, so I'll write it down.

If you want to add today's date and time to the file name when you run the shell and back up the file, remember the following and put it in the shell script so that you do not have to change the date every time.

Format YYYYMMDD

Outputs the Christian era date without partitions.

$(date "+%Y%m%d")

Output example

% echo $(date "+%Y%m%d")
20200316

Format YYYYMMDDHHMMSS

Outputs the time to date and seconds in the Christian era without partitions.

$(date "+%Y%m%d%H%M%S")

Output example

% echo $(date "+%Y%m%d%H%M%S")
20200316122346

Format YYYY / MM / DD-HH: MM: SS

Example with dividers such as slashes and semicolons

$(date "+%Y/%m/%d-%H:%M:%S")

Output example

% echo $(date "+%Y/%m/%d-%H:%M:%S")
2020/03/16-12:24:45

that's all