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this lets you edit a crontab file (which may be used as a backup as well) and insert this into your crontab. this way is especially handy, when multiple users are working on one account (e.g. root)
There are 3 alternatives - vote for the best!
If you can do better, submit your command here.
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The place of file .crontab is not defined.
"Each user can have their own crontab, and though these are files in /var, they are not intended to be edited directly." (man crontab)
crontab -ecrontab -u user_name -eIt looks like what this command is doing is making a temporary file ~/.crontab and then loading it into the current user's crontab file. Sometimes I will do something like "vi ~/crontab.txt" and then when it looks nice I will do a "crontab ~/crontab.txt" to load it. This command looks like it simplifies this method a bit by putting both commands on the same line so as soon as you are done editing it, it loads the file.