| Brand | Key |
| Lenovo (laptops, excl ThinkPads) | F2 or FN+F2 |
| Lenovo (desktops) | F1 |
| Lenovo (ThinkPads) | Enter, followed by F1 |
| Dell | F2 or F12 |
| HP | F1, F10 or DEL |
| ASRock | F2 or DEL |
| ASUS | F2 |
| Acer | F2 or DEL |
| Gigabyte | F2 or DEL |
| MSI | DEL |
| Samsung | F2 |
| Toshiba | F2 |
Windows 10 (and presumably Windows 11 as well) has the very annoying ‘feature’ of thinking it can manage your printer better than you can yourself.
If you printer stops working for some inexplicable reason, then the changes are great that Windows had decided to change your printer port to a WSD port, even if you installed it with an IP port.
To avoid this behaviour, delete the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Monitors\WSD Port
Suppose you have a variable containing a directorypath:
#!/bin/bash
directorytouse="/home/myhome/whateverdirectory/"If you try to test in your bash script if the directory exists, then it will fail because of the trailing slash:
if [ ! -d "${directorytouse} ]
then
echo -e "directory does not exist!"
fiThe easiest way to remove this / if it is present is to use shell parameter expansion:
if [ ! -d "${directorytouse%/}" ]
then
echo -e "directory does not exist!"
fiThis will get rid of the trailing slash if there is one. If there is no trailing slash present, then nothing will happen.
If you have ever used cat or tail to accidentally show a binary file, you will have noticed your terminal show graphical garbage instead of readable text. As shown in the screenshot below:
You will find several suggested fixes on the internet for this, including:
The only one that worked for me is entering the following (blindly, since you can ‘t read what your are typing) on the terminal prompt:
echo -e "\033c"A good practice is to define an alias in your startup script with the following command:
alias resetterminal='echo -e "\033c"'Next time you have this problem, you can then type (blindly) ‘resetterminal’ to fix the problem.
If your Vi or Vim session is hanging and is not responding to anything, then it might be because you pressed CTRL+S accidentally (out of habbit). To fix this, just press CTRL+Q to unblock the session.
If your wifi card is not available after booting your Dell XPS-15 laptop (with Ubuntu 20.04 or 22.04), or your external monitor refuses to display anything, please try the following:
start up your laptop without your power supply plugged in, connect with wifi, and/or your external monitor and only then plug in your power supply.
This fix works everytime for me.
If you want to reset your monitor settings to default through the terminal (your second screen is broken and the settings are ‘shown’ there and you don’t want to restart your laptop), you can use the following command:
xrandr -s 0If you press CTRL-ALT-DEL on a Ubuntu Server the server will be shut down without asking any confirmation or password. This is of course not a good idea.
To disable this, enter the following commands as root:
systemctl mask ctrl-alt-del.target
systemctl daemon-reloadIf you try to refresh the data in a table while using DBeaver, and no changes are shown, it could be that you are in transactional mode.
To fix this, click on the menu ‘Database’ and select ‘Transaction mode’. Select ‘Auto-commit’ and ‘Serializable’.
If you want to remove some commands from your bash history use the following command:
history -d 1001where 1001 is the number of the history line. Of course this might add another problem: the command ‘history -d 1001’ is now added to your history.
If you want to execute a command and don’t want it to get in your history list (because it contains sensitive data, or you just don’t want to clutter your history), start the command with a space.
For this to work the environment variable $HISTCONTROL has to be set to ‘ignorespace’ or ‘ignoreboth’.
export HISTCONTROL=ignorespace