Ch 25 - simple script to list all tunables

dbuday

While listing tunable values of /proc/sys/vm, i came to idea to write a script to do it (feel free to use it any way you want it).

I also added some other locations of /proc/sys and some log files.

 

What could be also added?  All suggestions are welcome.

Script is here: https://www.dropbox.com/s/q10x5xn4kn9ccu3/listem?dl=1

 

 

(Another script, for Ubuntu, to make your terminal look the way you want it -  https://www.dropbox.com/s/578c9ozcarb0esk/ttyset?dl=1  - only for tty, not emulator

Enjoy.)

luisviveropena

That's a collaborative spirit

Regards,

Luis.

dbuday

Script is now bigger.

You can also see some information from /proc, make backup of all tunables, and also change them all from script.

I hope you will find it useful.

 

I'm still taking suggestions...

saqman2060

What is this function (tput bold) and (tput sgr0)? Could you give an explaination on what it is and what it can do?

dbuday

It's all in here:  http://www.tldp.org/HOWTO/Bash-Prompt-HOWTO/x405.html

tput is not related to this course - i use it to highlight important things and make it clearer to user

saqman2060

Thank you

coop

Nice initiative!  A couple of comments

1) you probably need to make listem it a little more distribution aware, at least for the files on /var/log go

2) I got confused for a second because the terminal setting program doesn't work in a gnome-terminal, but it does work on a console

 

3) /var/log/dmesg never changes; it is the value of dmesg > /var/log/dmesg right after boot.  You can get a running look at the kernel message buffer by doing: dmesg -w

You could make the scripts more compact by using case .... esac instead of many repetitive ifs, but it would not chnage functioning.

dbuday

Thanks a lot on your reply.

 

Yes i must run deeper into other distributions and notice differencies; i'm doing this as i learn, so i got a lot more to learn... Obviously.

( Right now i think how to implement apparmor and/or selinux properties change. ;; and - i've deleted Fedora and installed CentOs 6 as adviced by you )

 

I see also that  /var/log/lastlog returns some rubbish,  and /var/log/messages doesn't exist at all (Ubuntu 14.04) - so this part needs an update.

I also think i should use -f instead of -e option when checking for file existance, then i probably wouldn't get those (5 in total) access denied messages (or am i wrong?).

dmesg -w is returning invalid option error !!

 

I made a script for kernel removing, but it is croatian only, so i need to translate it first, if i want to include it.

As i learn i will surely add some more monitoring tools; at the end - script like that could really be of some help to administrators.

If not, it's still good practice though.

 

Have i missed some important tunables to show (or i'm done with that part)?

 

Thanks a lot for your interest and help.

saqman2060

These "tput" commands could prove useful for several scripts that i've created for systems admin and diagnostics. They are not as in-depth as your's is but they are simple and easy to customize. Thanks for sharing your work with us.