Im not responsible if you destroyed your computer or data by following these steps. Deleting things in linux maybe a long and complicated processes if you really wnat to remove all traces of an app existing.
How to uninstall an application completely
Imagine that app is munin, which installs itself all over the system
Before removing and app, close it down (ALSO DO A SYSTEM BACKUP IF YOU CAN, OR SNAPSHOT YOU CAN REVER TO! IM NOT RESPONSIBLE IF AFTER THIS YOUR SYSTEM WONT LOAD OR IMPORTANT DATA IS LOST)
# ps aux | grep munin
Look at the pids, example 543 and 234
# kill 543 # kill 234
Double check its closed by repeating the “ps aux” command
You might need to “kill -9” the processes
So after its closed lets delete
# apt-get remove munin
# apt-get purge munin
# apt-get autoremove # apt-get install -f
if the last 2 steps removed an app/package you need just “apt-get install” it
Also double check what other software you can get rid of:
# dpkg -l | grep "munin"
Lets say you find this:
So then I can delete those
# apt-get purge munin-common # apt-get purge munin-node
# apt-get autoremove # apt-get install -f
NOTE: check out my article on power deleting apps (be careful with that) HOW TO MASS REMOVE AN APP
Now we are going to work at deleting files and folders that werent removed:
Removing Files and Folders
now look for files that werent removed
# cd / # find / -type f -iwholename "*munin*"
Or if you have multiple filesystems
# find / -xdev -type f -iwholename "*munin*" # find / -mount -type f -iwholename "*munin*"
For the above -xdev/-mount method: You might need to start the search in other locations as / will only look thru the / root filesystem, but what if you had stuff installed in the /home filesystem as well:
# find /home -xdev -type f -iwholename "*munin*" # find /home -mount -type f -iwholename "*munin*"
NOTE: I show that -xdev and -mount are the same thats why i put it there twice
There is lots of ways to do above commands
What to do with the findings:
Then remove any directories that have munin
so i would remove
# rm -rf /var/cache/munin
Which would remove just the munin folder in /var/cache (but not /var/cache). It would also remove the www folder in munin
However DONT DO THIS:
lets say it found
Dont delete /etc obviously just delete the munin.conf file
To help with not removing the wrong folders, just look for folders that have word munin in it, and not files:
Look for directories that werent removed as well and remove the directories
# find / -xdev -type d -iwholename "*munin*" # find / -mount -type d -iwholename "*munin*"
Example I see it found
# /var/log/munin # rm -rf /var/log/munin
Now not all files are truely cleaned up, some files are shared with other files, so lets clean up the insides of files.
What if you edited somethings there for munin, now you need to remove those edits
Insides of files
Finally lets find all of the config files that mention munin
# cd /etc # egrep -ir "munin" *
All of the files and folders will be listed.
Go into each file and remove the lines (or sections of lines, or just parts of line) that have munin in it
Becareful you must understand how that setting files worked
Sometimes you will need to remove just part of a line that mentiones munin
Then other times you are safe to delete the whole line that mentions munin
Then there is whole sections that need to be deleted
DELETING MUNIN WORDS IN A LINE
Some config files munin will be mentioned but you can delete the whole line.
Example: /etc/init.d/.depend.start and /etc/init.d/.depend.sttop
Lets look at /etc/init.d/.depend.start notice munin on the top line
TARGETS = rsyslog motd killprocs bootlogs binfmt-support apache2 munin single mysql atd dbus sendmail cron ssh rsync saned rmnologin rc.local INTERACTIVE = apache2 apache2: rsyslog single: killprocs motd bootlogs mysql: rsyslog atd: rsyslog dbus: rsyslog sendmail: rsyslog cron: rsyslog ssh: rsyslog rsync: rsyslog saned: rsyslog dbus rmnologin: apache2 rsyslog mysql atd saned dbus sendmail motd bootlogs binfmt-support cron ssh rsync rc.local: apache2 rsyslog mysql atd saned dbus sendmail motd bootlogs binfmt-support cron ssh rsync
NOTE: the above config file is just made up, i grabbed mine and added in munin where I think it will be
Notice we cant just delete the line where munin is, it will delete that whole line
So go in with vi and delete munin from that line
# vi /etc/init.d/.depend.start
Scroll with arrow keys to the “m” in munin and press “x” until its gone and you only have 1 space between “apache2” and “single” so that it says this after:
TARGETS = rsyslog motd killprocs bootlogs binfmt-support apache2 single mysql atd dbus sendmail cron ssh rsync saned rmnologin rc.local
Then save and exit “:wq!”
Another alternative is to use sed (only use this on config files were your certain deleting the word munin out of each line will be okay):
# sed -i 's/munin //g' /etc/init.d/.depend.start
this will also work on:
# sed -i 's/munin //g' /etc/init.d/.depend.stop
NOTE: I use a sed search and replace to replace “munin ” (munin and a space sign) with nothingness (the same thing as a delete). Why the extra space? so that I dont get double space between “apache2” and “single” after words
NOTE: I dont think my /etc/init.d/.depend.boot file had anything mentioned about munin, thats why its not mentioned in this example
DELETING MUNIN LINES
Delete a line example:
/etc/shadow found this line that had munin in it
# vi /etc/shadow
And scroll down with arrow keys to that line and press “dd” to delete that line then save and exit “:wq!”
Here is a shortcut to delete munin lines (becareful only delete the line if your certain it can go):
I wouldnt use this on config files that have munin “sections” or munin in parts of line. As it only deletes the line. it wont delete the surrounding sections.
So this will be save on files like /etc/shadow and /etc/gshadow and /etc/passwd and /etc/group
# sed -i "/munin/d" /etc/shadow
that says delete the line that has munin in the shadow file and save it (-i meaning inline, meaning save, with out -i it will jsut show you the result on the output)
DELETING MUNIN SECTIONS
Deleting sections of munin will not be as easy as above to becuase the sections could be like this
<Directory /munin> stuff stuff stuff stuff <Directory />
Notice that munin is only mentioned on the top line, but that whole section has to do with it. So we cant jsut delete the line talking about munin, and we cant just talk about the directory
In this case go in with vi and delete all of those 6 lines
# vi /whateverfile
Find the top line of the section talking about munin, scroll down to it and press “dd” as many times until that section is gone, then save and exit “:wq!”
Final steps, other config files and dead links
This method only covers files that talk about munin in clear text. What bout binary files etc. Hopefully the apt-get got rid of all of those.
By now we are almost done some dead links might still exist just double check to get all files:
# find / -iwhole "*munin*"
Then if its just some links you dont care about just do this:
# find / -iwhole "*munin*" --delete
Just reboot the system and hopefully it comes up 🙂