Wednesday, August 16, 2017

Sometimes cron runs twice

I suspected cron was running twice. I confirmed by checking the system logs

grep CRON /var/log/syslog

Then I killed cron and restarted it

sudo /etc/init.d/cron stop
sudo /etc/init.d/cron start

Wednesday, September 28, 2016

Sending mail in unix with attachment

You would need to install sharutils

sudo apt-get install sharutils

Then run this

uuencode <path_to_file> <name_to_give_attachment> | mail -s "Subject"

Also see

Sunday, April 17, 2016

Sorting by type first then alphabetically

The script below ensures that items are sorted by type first then by alphabetical order.

The spaceship operator

Just ran into this and I thought it was really cool.

So the spaceship operator (<=>) delegates to the compareTo method:

assert (1 <=> 1) == 0
assert (1 <=> 2) == -1
assert (2 <=> 1) == 1
assert ('a' <=> 'z') == -1

For more checkout

Thursday, March 3, 2016

Sending mail in unix

When sending an email from unix do the following

echo "Mail Message" | mail -s "Subject"

In order to avoid getting your email marked as spam, ensure that the sending email is something realistic, probably a domain you own i.e.