Disable Suspend and Hibernate – Ubuntu

Open a Terminal from Applications>Accessories>Terminal. Become a root with su – or sudo su -

• vim /usr/share/polkit-1/actions/org.debian.aptxapianindex.policy

Find the lines:

• <allow_active>yes</allow_active>

Change this entry from “yes” to “no” to disable hibernate/suspend.

• <allow_active>no</allow_active>

Disable screen going blank ubuntu server / Network timeout

Using setterm command.

man setterm  : writes to standard output a character string that will invoke the specified terminal capabilities. Where possible terminfo is conâ sulted to find the string to use. Some options however (marked “virtual consoles only” below) do not correspond to a terminfo(5) capability. In this case, if the terminal type is “con” or “linux” the string that invokes the specified capabilities on the PC Minix virtual console driver is output. Options that are not implemented by the terminal are ignored

$ setterm -powersave off -blank 0

If it dumps back you with an error that read as follows:
cannot (un)set powersave mode

You need to shutdown X window system and rerun the above command. Better, add following two commands to your ~/.xinitrc file or /etc/rc.local

setterm -blank 0 -powersave off -powerdown 0
xset s off

Sendmail Linux Examples

Sendmail on the command line:

$ sendmail emailaddress write body of message CTRL-D

The CTRL-D is a end of message code for standard-in.

Example :

From: your-email@example.com

To: email@example.com

enter body of message

 

This message is missing a useful TO:line as well as a subject. To create these you need to create a file or use a script.

   $ vim email.txt

date: todays-date    // not required

to: user-email@example.com

subject: subject

from: your-email@example.com

Body of message goes here

 

Then call sendmail with that file as an input:

    $ sendmail -t user-email@example.com < email.txt

 

Or you can use the -toption to to tell sendmail to read the header of the message to figure out who to send it to.

$ sendmail -t < mail.txt

 

This will process the To: and CC: lines for you and send the mail to the correct addresses.

Or call from a script:

#!/usr/bin/perl

use Time::localtime;

open (OUT,”|/usr/sbin/sendmail -t”);

print OUT “From: your-email\@domain.com\n”; ## don’t forget to escape the @

print(OUT “Date: “.ctime().”\n”);

print(OUT “To: $email\n”);

print(OUT “Subject: $subject\n”);

print(OUT “\n”);

print(OUT “$body\n”);

close(OUT);

Create tar and copy to another server using tar

Just a note

Code:

tar -cvf – test | ssh -l username domain.com  “cd /home1/username && tar -xvf -”

Delete / remove old / order files in linux automatically

Code:

find /tmp/test -ctime +60 -delete

The above command  will delete any files created over 60 days ago in the /tmp/test  folder (and all subfolders).

You can add this to a cron job and it will be automatic daily, weekly, monthly