How do I permanently change permissions for /dev/ttyS0?
Solution 1
There's no need to change system file's permissions. The serial devices have the following default permissions:
crw-rw---- 1 root dialout ... /dev/ttyS0
So all you have to do is add the user to the dialout
group:
sudo adduser $USER dialout
Solution 2
Solution 1: check group of ttyS0 and then assign it to your user,then relogin or su - user
crw-rw---- 1 root dialout 4, 64 feb 28 18:23 /dev/ttyS0
usermod -aG dialout youruser
su - youruser
Solution 2: if you don't like the first solution edit /etc/udev/rules.d/50-tty.rules
KERNEL=="tty[A-Z]*[0-9]|pppox[0-9]*|ircomm[0-9]*|noz[0-9]*|rfcomm[0-9]*", GROUP="whateveryouwant"
restart udev or reboot and of course before add your user to selected group
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Claudio
Updated on September 18, 2022Comments
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Claudio over 1 year
My system is Ubuntu 13.04 and it works fine, but I have installed VirtuaBox to run Windows XP, which is essential for me to run an application that dialogues with an alarm setup by a USB-to-Serial adapter.
VirtualBox uses ttyS0 as a Serial port and the communication can start efficiently only if command
sudo chmod 666 /dev/ttyS0
is given to Terminal.Every time I boot Ubuntu,
ttyS0
permissions return to the default values and I have to runchmod
every time I boot-up.My question is: how can I change /dev/ttyS0 file permission permanently? If this is not a good practice, are there other manners to solve the issue?
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Claudio over 10 yearsThanks Eric, your solution worked for me after rebooting! Claudio :)
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rrosa over 9 yearsreboot is not required, re-login es enough. if you don't want to close your session you can also do
ssh $USER@localhost
(if you haveopenssh-server
installed) and use that terminal.