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Misc scripts

Renaming daily/weekly/monthly rsnapshot folders

If something went wrong with rsnapshot, it might be neccessary to remove the last created backup folder. But then you'd have to rename the whole lots again, so that the new last one is called 0. For instance, you have 29 daily backups and remove daily.0. This command will rename 1 to 0, 2 to 1, 3 to 2, etc:

for i in `seq 1 29`; do mv daily.$i daily.`expr $i - 1`; done 

 

Removing old kernels and headers

Because you automatically upgrade your kernels, your VMs get clogged up with old kernels and headers. Example:

 

visser@cajones:~$ ls -la /lib/modules
total 32
drwxr-xr-x  8 root root 4096 Mar 15 06:47 .
drwxr-xr-x 21 root root 4096 Sep  3  2014 ..
drwxr-xr-x  5 root root 4096 Jan 16 02:50 3.13.0-71-generic
drwxr-xr-x  5 root root 4096 Jan 16 02:51 3.13.0-74-generic
drwxr-xr-x  5 root root 4096 Jan 20 06:53 3.13.0-76-generic
drwxr-xr-x  5 root root 4096 Feb  2 06:37 3.13.0-77-generic
drwxr-xr-x  5 root root 4096 Feb 23 06:35 3.13.0-79-generic
drwxr-xr-x  5 root root 4096 Mar 15 06:48 3.13.0-83-generic

You should do some house cleaning by removing all old kernels, headers, and manually compiled modules. Make sure that you are running the latest kernel.

To list all installed kernels and accompanying headers:

visser@cajones:~$ apt-show-versions -b | grep -E 'linux-(headers|image(-extra)?)-[0-9]+'
linux-headers-3.13.0-71:all/trusty-security
linux-headers-3.13.0-71-generic:amd64/trusty-security
linux-headers-3.13.0-74:all/trusty-security
linux-headers-3.13.0-74-generic:amd64/trusty-security
linux-headers-3.13.0-76:all/trusty-security
linux-headers-3.13.0-76-generic:amd64/trusty-security
linux-headers-3.13.0-77:all/trusty-security
linux-headers-3.13.0-77-generic:amd64/trusty-security
linux-headers-3.13.0-79:all/trusty-security
linux-headers-3.13.0-79-generic:amd64/trusty-security
linux-headers-3.13.0-83:all/trusty-security
linux-headers-3.13.0-83-generic:amd64/trusty-security
linux-image-3.13.0-71-generic:amd64/trusty-security
linux-image-3.13.0-74-generic:amd64/trusty-security
linux-image-3.13.0-76-generic:amd64/trusty-security
linux-image-3.13.0-77-generic:amd64/trusty-security
linux-image-3.13.0-79-generic:amd64/trusty-security
linux-image-3.13.0-83-generic:amd64/trusty-security
linux-image-extra-3.13.0-71-generic:amd64/trusty-security
linux-image-extra-3.13.0-74-generic:amd64/trusty-security
linux-image-extra-3.13.0-76-generic:amd64/trusty-security
linux-image-extra-3.13.0-77-generic:amd64/trusty-security
linux-image-extra-3.13.0-79-generic:amd64/trusty-security
linux-image-extra-3.13.0-83-generic:amd64/trusty-security

You can't just purge all of these because you will trash your current kernel. So you need to exclude that, preferably using the uname command:

visser@cajones:~$ uname -r
3.13.0-83-generic

So this will yield:

visser@cajones:~$ apt-show-versions -b | grep -E 'linux-(headers|image(-extra)?)-[0-9]+' | grep -v `uname -r`
linux-headers-3.13.0-71:all/trusty-security
linux-headers-3.13.0-71-generic:amd64/trusty-security
linux-headers-3.13.0-74:all/trusty-security
linux-headers-3.13.0-74-generic:amd64/trusty-security
linux-headers-3.13.0-76:all/trusty-security
linux-headers-3.13.0-76-generic:amd64/trusty-security
linux-headers-3.13.0-77:all/trusty-security
linux-headers-3.13.0-77-generic:amd64/trusty-security
linux-headers-3.13.0-79:all/trusty-security
linux-headers-3.13.0-79-generic:amd64/trusty-security
linux-headers-3.13.0-83:all/trusty-security
linux-image-3.13.0-71-generic:amd64/trusty-security
linux-image-3.13.0-74-generic:amd64/trusty-security
linux-image-3.13.0-76-generic:amd64/trusty-security
linux-image-3.13.0-77-generic:amd64/trusty-security
linux-image-3.13.0-79-generic:amd64/trusty-security
linux-image-extra-3.13.0-71-generic:amd64/trusty-security
linux-image-extra-3.13.0-74-generic:amd64/trusty-security
linux-image-extra-3.13.0-76-generic:amd64/trusty-security
linux-image-extra-3.13.0-77-generic:amd64/trusty-security
linux-image-extra-3.13.0-79-generic:amd64/trusty-security

 

However this will also remove the headers of the current kernel, so we have to strip the -generic part from the uname output:

visser@cajones:~$ apt-show-versions -b | grep -E 'linux-(headers|image(-extra)?)-[0-9]+' | grep -v $(uname -r | sed -E 's/-[a-z]+$//')
linux-headers-3.13.0-71:all/trusty-security
linux-headers-3.13.0-71-generic:amd64/trusty-security
linux-headers-3.13.0-74:all/trusty-security
linux-headers-3.13.0-74-generic:amd64/trusty-security
linux-headers-3.13.0-76:all/trusty-security
linux-headers-3.13.0-76-generic:amd64/trusty-security
linux-headers-3.13.0-77:all/trusty-security
linux-headers-3.13.0-77-generic:amd64/trusty-security
linux-headers-3.13.0-79:all/trusty-security
linux-headers-3.13.0-79-generic:amd64/trusty-security
linux-image-3.13.0-71-generic:amd64/trusty-security
linux-image-3.13.0-74-generic:amd64/trusty-security
linux-image-3.13.0-76-generic:amd64/trusty-security
linux-image-3.13.0-77-generic:amd64/trusty-security
linux-image-3.13.0-79-generic:amd64/trusty-security
linux-image-extra-3.13.0-71-generic:amd64/trusty-security
linux-image-extra-3.13.0-74-generic:amd64/trusty-security
linux-image-extra-3.13.0-76-generic:amd64/trusty-security
linux-image-extra-3.13.0-77-generic:amd64/trusty-security
linux-image-extra-3.13.0-79-generic:amd64/trusty-security

 

This looks good. Now we can purge these packages:

 

visser@cajones:~$ sudo apt-get purge `apt-show-versions -b | grep -E 'linux-(headers|image(-extra)?)-[0-9]+' | grep -v $(uname -r | sed -E 's/-[a-z]+$//')`
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Selected version '3.13.0-71.114' (Ubuntu:14.04/trusty-updates [all]) for 'linux-headers-3.13.0-71'
Selected version '3.13.0-71.114' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-headers-3.13.0-71-generic'
Selected version '3.13.0-74.118' (Ubuntu:14.04/trusty-updates [all]) for 'linux-headers-3.13.0-74'
Selected version '3.13.0-74.118' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-headers-3.13.0-74-generic'
Selected version '3.13.0-76.120' (Ubuntu:14.04/trusty-updates [all]) for 'linux-headers-3.13.0-76'
Selected version '3.13.0-76.120' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-headers-3.13.0-76-generic'
Selected version '3.13.0-77.121' (Ubuntu:14.04/trusty-updates [all]) for 'linux-headers-3.13.0-77'
Selected version '3.13.0-77.121' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-headers-3.13.0-77-generic'
Selected version '3.13.0-79.123' (Ubuntu:14.04/trusty-updates [all]) for 'linux-headers-3.13.0-79'
Selected version '3.13.0-79.123' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-headers-3.13.0-79-generic'
Selected version '3.13.0-71.114' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-3.13.0-71-generic'
Selected version '3.13.0-74.118' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-3.13.0-74-generic'
Selected version '3.13.0-76.120' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-3.13.0-76-generic'
Selected version '3.13.0-77.121' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-3.13.0-77-generic'
Selected version '3.13.0-79.123' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-3.13.0-79-generic'
Selected version '3.13.0-71.114' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-extra-3.13.0-71-generic'
Selected version '3.13.0-74.118' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-extra-3.13.0-74-generic'
Selected version '3.13.0-76.120' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-extra-3.13.0-76-generic'
Selected version '3.13.0-77.121' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-extra-3.13.0-77-generic'
Selected version '3.13.0-79.123' (Ubuntu:14.04/trusty-updates [amd64]) for 'linux-image-extra-3.13.0-79-generic'
The following packages will be REMOVED:
  linux-headers-3.13.0-71* linux-headers-3.13.0-71-generic*
  linux-headers-3.13.0-74* linux-headers-3.13.0-74-generic*
  linux-headers-3.13.0-76* linux-headers-3.13.0-76-generic*
  linux-headers-3.13.0-77* linux-headers-3.13.0-77-generic*
  linux-headers-3.13.0-79* linux-headers-3.13.0-79-generic*
  linux-image-3.13.0-71-generic* linux-image-3.13.0-74-generic*
  linux-image-3.13.0-76-generic* linux-image-3.13.0-77-generic*
  linux-image-3.13.0-79-generic* linux-image-extra-3.13.0-71-generic*
  linux-image-extra-3.13.0-74-generic* linux-image-extra-3.13.0-76-generic*
  linux-image-extra-3.13.0-77-generic* linux-image-extra-3.13.0-79-generic*
0 upgraded, 0 newly installed, 20 to remove and 35 not upgraded.
After this operation, 1,357 MB disk space will be freed.
Do you want to continue? [Y/n]

 

 

Removing set of e-mail address from another set of email address

List of address with optional names, separated by whitespace:

visser@rasputin:~$ cat addresses.txt
dick@TIENHUIS.nl  Dick Visser
dnmvisser@Gmail.CoM  Dick "Gmail" Visser
dnmvisser@yahoo.com
dick.visser@geant.org  Dick Visser
visser@terena.org Dick's old address...

Similar for a blacklist:

visser@rasputin:~$ cat blacklist.txt
Dnmvisser@gmail.com  Evil guy

 

You can 'subtract' the blacklist using this Ruby one line:

 

visser@rasputin:~$ ruby -e 'a = File.readlines("addresses.txt").map { |x| x.split.first.downcase } - File.readlines("blacklist.txt").map { |x| x.split.first.downcase }; puts a'
dick@tienhuis.nl
dnmvisser@yahoo.com
dick.visser@geant.org
visser@terena.org

 

 

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