sudo apt install fprintd libpam-fprintd

After the install – update the following file to set the timer to unlimited, otherwise the fingerprint scanner will time out during login:

sudo vi /etc/pam.d/common-auth

and look for the line that has the pam_fprintd in the name

auth [success=2 default=ignore] pam_fprintd.so max_tries=1 timeout=10

Usually the default is timeout=10 and max_tries=1, I updated mine like below, so it never times out and I have 2 tries

auth [success=2 default=ignore] pam_fprintd.so max_tries=2 timeout=-1

This works on sudo auth and login from lock, haven’t fully tested yet like startup etc. It is a little unstable though, I had it fail on me few times where it wouldn’t recognize the scanner anymore. I will update this post if I find anything.

sudo apt-get install libapache2-mod-php7.0

A new Ubuntu 16.04.1 installation – after short usage the computer slows down and the CPUs are about 50% busy. There are some kidle_inject processes running which take this valuable CPU.

Top shows the following:

 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 
 6898 root -51 0 0 0 0 S 47.1 0.0 1:20.16 kidle_inject/5 
 6900 root -51 0 0 0 0 S 47.1 0.0 1:20.38 kidle_inject/7 
 6894 root -51 0 0 0 0 S 41.2 0.0 1:13.55 kidle_inject/1 
 6895 root -51 0 0 0 0 S 41.2 0.0 1:16.90 kidle_inject/2 
 6896 root -51 0 0 0 0 S 41.2 0.0 1:18.28 kidle_inject/3 
 6897 root -51 0 0 0 0 S 41.2 0.0 1:18.64 kidle_inject/4 
 6899 root -51 0 0 0 0 S 41.2 0.0 1:20.02 kidle_inject/6 
 6893 root -51 0 0 0 0 S 29.4 0.0 1:08.23 kidle_inject/0

To stop these processes run the following command – it will disable them only for the current session. I very rarely reboot so I haven’t looked into making it permanent yet.

$ sudo rmmod intel_powerclamp

set -o allexport

with the above, then you can just write the following, for example:

TEST_DIR=/tmp/test

instead of

export TEST_DIR=/tmp/test

To disable the all export:

set +o allexport

You are also able to set environment variables without the export or allexport, however that will NOT make the variable available to sub-processes.

wc -c filename == counts the bytes
wc -m filename == counts the characters

this can be combined with other commands like grep, awk, sed

example with sed:

sed -n '1p' filename | wc -c

the above will print the first line from filename and count the bytes in that line

%s/[ctrlkey+v and ctrl-key+M]//g

sed 's/[<space>][<tab>][<space>][<tab>]*/ /g' filename

can also be:

 sed 's/[<space>][<tab>][<space>][<tab>]*/ /g' filename > newfilename

note: g in the end means GLOBAL

In the above samples, <space> means ‘ ‘ (empty space) and <tab> means ‘      ‘ (tab key press).

select s.username, s.sid, s.osuser, sql_text 
from v$sqltext_with_newlines t,v$session s 
where t.address = s.sql_address 
and t.hash_value = s.sql_hash_value 
and s.status = 'ACTIVE' 
and s.username <> 'SYSTEM' 
order by s.sid, t.piece