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I am left handed person.
Therefore I want to interchange the typical mouse buttons for right and left clicks.

I want to do this via terminal. May someone please suggest the command for it?

Is it possible to interchange these clicks at the login screen also? I am using Ubuntu 12.04.

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4 Answers 4

up vote 6 down vote accepted
xmodmap -e "pointer = 3 2 1"

in a terminal should work. If you want to run that command at the start of lightdm (the default login screen), you can edit /etc/lightdm/lightdm.conf like described here - use the xmodmap command instead of xbacklight in the script, of course.

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1  
this works for the present session.. how to make it permanent??? –  Fookraa Jun 16 '12 at 18:33
    
It should be permanent if you put it in /etc/lightdm/lightdm.conf. If not, you can put it in Startup Applications or create a .desktop file in ~/.config/autostart from the terminal. –  elmicha Jun 16 '12 at 19:45

You can use also xinput to do this.

It will switch the buttons on one mouse only.

First use-

xinput list

To see where you mouse is will be somthing like

"USB Mouse"     id=12       [slave pointer]

So use the id number for the next command to switch the button assignment.

xinput set-button-map 12 3 2 1

So, you would switch out 12 with the id number of your mouse.

Source: 1

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xmodmap is the command to change the mouse button mapping:

xmodmap -e "pointer = 3 2 1"

will remap the first three buttoons, left, middle and right, to act like , right, middle and left - not actually changing the middle button mapping.

That applies the change to the current session - more precisely, to the current X display, for exanple :0.

To save the change persistent over sessions, put the mapping into the file

~/.Xmodmap

If it does not exist, create it, liketouch ~/.Xmodmap

Edit it to add the line

pointer = 3 2 1

If there already is a pointer line, it may have some function, of course; Instead of replacing it, better modify the first three values - keeping a comment with the old:

For example,

pointer = 1 2 3 4 5 16 17 8 9 10 11 12 13 14 15 6 7 18 19 20 21 22 23 24

becomes

!pointer = 1 2 3 4 5 16 17 8 9 10 11 12 13 14 15 6 7 18 19 20 21 22 23 24
pointer = 3 2 1 4 5 16 17 8 9 10 11 12 13 14 15 6 7 18 19 20 21 22 23 24


I'm used to ~/.Xmodmap allways just working; But see .Xmodmap works only when automatic login disabled? if it does not.

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Execute this code in command prompt, it will remove and reset Optical mouse and touchpad to default- left click is for clicking and right click is for options.

modprobe -r psmouse
modprobe psmouse proto=imps
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