Make a new archive once per minute using "crontab"

Solution 1:

cron treats % as newlines. You need to use escape it i.e. use \% to get literal % as used in date.

So you need:

date +"\%Y\%m\%d\%H\%M" 

Or you can use a script and use all the commands in the script and call the script from crontab.

From man 5 crontab:

Percent-signs (%) in the command, unless escaped with backslash (\), will be changed into newline characters, and all data after the first % will be sent to the command as standard input. There is no way to split a single command line onto multiple lines, like the shell's trailing "\".

Solution 2:

Use \% instead of % - cron uses % as a newline.