How to start GNOME Wayland session from command line/tty? [closed]
A working solution per Jonas Ådahl a mutter developer: Usually what I do is switch to a VT and run: dbus-run-session — gnome-shell –display-server –wayland
linux
Is it valid to have multiple signal handlers for same signal?
As said by others, only one signal handler can be set, which is the last one. You would then have to manage calling two functions yourself. The sigaction function can return the previously installed signal handler which you can call yourself. Something like this (untested code): /* other signal handlers */ static void (*lib1_sighandler)(int) = … Read more
Opening default text editor in Bash?
The user’s chosen editor should be in $EDITOR, but you must still choose a sane default. “${EDITOR:-vi}” file.txt
bind socket to network interface
You can bind to a specific interface by setting SO_BINDTODEVICE socket option. struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), “eth0”); if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr)) < 0) { … error handling … } Warning: You have to be root or have the CAP_NET_RAW capability in order to use this option. The second … Read more
How can I simulate a failed disk during testing?
There are several layers at which a disk error can be simulated. If you are testing a single user-space program, probably the simplest approach is to interpose the appropriate calls (e.g. write()) and have them sometimes return an error. The libfiu fault-injection library can do this using its fiu-run tool. Another approach is to use … Read more
How can I make a public HTML folder in Ubuntu?
Assuming you’ve already installed apache, do the following: sudo a2enmod userdir sudo service apache2 reload The first command enables the userdir apache mod, which does exactly what you want. The second reloads apache configurations so that it starts using the new configuration. To install apache2: sudo apt-get install apache2 Of course, you’ll also need to … Read more
using sudo inside jupyter notebook’s cell
Update: I checked all the methods, all of them are working. 1: Request password using getpass module which essentially hides input by user and then run sudo command in python. import getpass import os password = getpass.getpass() command = “sudo -S apt-get update” #can be any command but don’t forget -S as it enables input … Read more
What does the k parameter do in the sort function (Linux Bash Scripting)?
KEYDEF is F[.C][OPTS][,F[.C][OPTS]] for start and stop position, where F is a field number and C a character position in the field; both are origin 1, and the stop position defaults to the line’s end. If neither -t nor -b is in effect, characters in a field are counted from the beginning of the preceding … Read more
How to grep ‘—‘ in Linux? grep: unrecognized option ‘—‘
This happens because grep interprets — as an option instead of a text to look for. Instead, use –: grep — “—” your_file This way, you tell grep that the rest is not a command line option. Other options: use grep -e (see Kent’s solution, as I added it when he had already posted it … Read more
is there a way to find list of valid locales in my linux using perl?
This command will give you a list of locales: locale -a From a Perl script you can execute the same using system(“locale -a”);