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---
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title: Linux
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author: "Unknown Author"
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description: Tips and tricks for GNU/Linux and Unix
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tags:
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- linux
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- arch
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---
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# Black screen and LightDM doesn't unlock
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Add this to your /etc/lightdm/lightdm.conf file:
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```cfg
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[LightDM]
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logind-check-graphical=true
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```
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# Edit previous commands
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`fc` is a shell builtin to list and edit previous commands in an editor.
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In addition to editing a single line (which you can also do with `C-x C-e`), it also allows you to edit and run several lines at the same time.
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You use it like this:
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List previous commands
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```shell
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$ fc -l
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10259 nvim deploy.sh
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10260* cd ..
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10261* nvim content/cheatsheet/linux.md
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10262 cd
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```
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List commands with date (in zsh)
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```shell
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$ fc -ld
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10260* 19:38 cd ..
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10261* 19:38 nvim content/cheatsheet/linux.md
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10262 19:40 cd
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10263 19:40 fc -l
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```
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You can add the date too:
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```shell
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$ fc -fld
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10262 1/10/2019 19:40 cd
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10263 1/10/2019 19:40 fc -l
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10264 1/10/2019 19:40 fc -ld
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```
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You can edit a range of commands
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```shell
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$ fc 10262 10264
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```
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The range can be relative to the current position, so the previous command is equivalent to:
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```shell
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$ fc -3 -1
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```
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If you save and exit, all commands are executed as a script, and it will be added to your history.
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Source: https://shapeshed.com/unix-fc/
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# Prevent logoff from killing tmux sessions
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Lately I've noticed that logging out of i3, intentionally or when i3 fails, would also kill any tmux or emacs sessions.
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This is extremely annoying.
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This is caused by a new default in logind (systemd's login) to kill user process on logoff.
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You can revert this setting in your logind.conf (`/etc/systemd/logind.conf`):
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```cfg
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KillUserProcesses=no
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```
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Or only for a specific process (e.g., tmux):
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```shell
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systemd-run --scope --user tmux
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```
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Source: https://unix.stackexchange.com/questions/490267/prevent-logoff-from-killing-tmux-session
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# Upload a temporary file
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Sometimes you just need to copy/paste a file from a server, and copying from the terminal can be a hassle.
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These two services are command-line "pastebins" just one curl away:
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```shell
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<command> | curl -F 'sprunge=<-' http://sprunge.us
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# OR
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<command> 2>&1 | curl -F 'f:1=<-' ix.io
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# OR
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<command> | curl -F"file=@-" https://ttm.sh
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```
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# Install Fortinet SSLVPN support for NetworkManager
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UPM (Universidad Politécnica de Madrid) uses a propriatary VPN solution.
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The instructions for GNU/Linux on their website involve downloading a specific client (`.tar.gz`) and manually running it.
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That works, but it is kind of a hassle.
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A much more convenient alternative is installing this NetworkManager plugin:
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```shell
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pacman -Sy networkmanager-fortisslvpn
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# Or apt get install networkmanager-fortisslvpn
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```
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Now you can simply add a new VPN connection in NetworkManager and manage it as you would any other connection.
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