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Using crontab some times can get little confusing due to the field names, values, syntax, redirection. Learn crontab with different examples for each fields, you can use with minor modifications or create new ones based off these examples
Linux and Unix shell redirections are very useful in command line and shell scripting to redirect and collect errors and outputs. Standard output and standard errors are used a lot but still there is lot of confusion about the meaning, actual execution and correct way to utilize it. learn about 2>&1 redirection with examples to use in your scripts and commands.