Cron / Crontab – disable e-mail notifications

There are 2 ways to prevent cron to send out e-mail notifications after jobs are run:

1. Ensure there are no output from the script(s) being run by sending the output to /dev/null
   Simply append one of the following directives to the end of your script.

   >/dev/null 2>&1.

   OR

   &> /dev/null

   Your crontab would now look something like:

   0 1 5 10 * /path/to/script.sh >/dev/null 2>&1

   OR

   0 1 5 10 * /path/to/script.sh &> /dev/null

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‘vi’ quick command references

I’m a die hard vi user and still prefer using vi to edit plaintext files. There were some discussion on twitter on vi awhile back and I thought I’d share my own command cheat sheet for vi in edit mode. This is not quite a full tutorial but makes for a useful reference.

Editing Text…

i Insert before cursor
I Insert before line
a Append after cursor
A Append after line
o Open a new line after current line
O Open a new line before current line
r Replace one character
R Replace many characters
x Delete character to the right of cursor
X Delete character to the left of cursor
D Delete to the end of the line
dd Delete current line
:d Delete current line
yy Yank the current line
p Put after the position or after the line
J Join lines
u Undo last change

Moving the cursor around… (more…)