Birmingham mumbai

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If you have more than one text editor on your system, you may see output similar to 
the following:
Figure 7.10: Selecting an editor for use with the crontab command
In this case, you'll simply press the number corresponding to the text editor you'd 
like to use when creating your 
cron
 job. To choose an editor and edit your 
crontab
 
with a single command, the following command will do exactly that:
EDITOR=vim crontab -e 
In this example, you can replace 
vim
 with whatever text editor you prefer. At this 
point, you should be placed in a text editor with your 
crontab
 file open. The default 
crontab
 file for each user features some helpful comments that give you some useful 
information regarding how 
cron
 works. To add a new job, you would scroll to the 
bottom of the file (after all the comments) and insert a new line. Formatting is very 
particular here, and the example comments in the file give you some clue as to how 
each line is laid out. Specifically, this part:
m h dom mon dow command 

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Chapter 7