Difference between revisions of "Linux - Smart Linux Tricks"

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<code>Print</code> may have its own special label on your keyboard. On mine the <code>Print</code> key is labeled <code>PrtSc</code>.
 
<code>Print</code> may have its own special label on your keyboard. On mine the <code>Print</code> key is labeled <code>PrtSc</code>.
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 +
===Testing Network Connectivity===
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 +
====A handy little script:====
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#!/bin/bash
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 +
if nc -zw1 pfSense 443
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then
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  echo "We have DNS..."
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else
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  echo "NOPE!  No DNS..."
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  sudo systemctl restart systemd-resolved
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  exit
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fi
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Uses [https://linux.die.net/man/1/nc netcat] (nc) to simply check if the router ([[NetMan - pfSense|pfsense]]) is currently findable by name & responding to HTTPS (port 443).
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Then either tells you if it's OK or asks for your password to restart the [https://www.man7.org/linux/man-pages/man8/systemd-resolved.8.html DNS resolver].
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=== Some other tips... ===
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* [https://www.cyberciti.biz/faq/linux-copy-clone-usb-stick-including-partitions/ Copy and clone USB stick including partitions]
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* [https://www.cyberciti.biz/tips/how-do-i-save-recover-data-from-crashed-disks-with-dd-and-ddrescue-command.html Save and Recover Data From Crashed Disks With ddrescue Command Like a Pro]
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* [[Linux - Process Supervision using Monit|Process Supervision using Monit]]
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* [https://www.youtube.com/watch?v=C3sPd3slAho How to Make Linux Hate You]
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* [https://unix.stackexchange.com/questions/254477/linux-alternative-to-altnumpad-codes Linux alternative to alt+numpad codes]
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* [https://unix.stackexchange.com/questions/159094/how-to-install-a-deb-file-by-dpkg-i-or-by-apt How to install a deb file, by dpkg -i or by apt?]
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* Get details about the linux distro installed:
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** <code>cat /etc/*release*</code>
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* [http://www.fosslinux.com/1168/how-to-install-updates-on-ubuntu-linux-mint-by-command-line.htm Install Updates on Ubuntu, Linux Mint, and elementary OS from Terminal]
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* Panel Menu Not Responding
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** Right click on an empty-is spot...Verify it's not in '''Panel edit mode'''
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* [https://forums.linuxmint.com/viewtopic.php?t=249705 <nowiki>[SOLVED]</nowiki> gnome-keyring-daemon prevents shutdown]

Latest revision as of 23:04, 30 June 2020

A collection of tips & tricks for using Linux...

Restart a service[edit | edit source]

sudo service FOOBAR restart

or

sudo systemctl restart FOOBAR.service

Where "FOOBAR" is the name of the service you want to restart...

Taking a screenshot in Mint Cinnamon[edit | edit source]

Here are the default shortcuts. You can customize them in Keyboard Settings, as shown in the image that started this post.

Action Shortcut
Take a screenshot Print
Take a screenshot of a window Alt + Print
Take a screenshot of an area Shift + Print
Copy screen to clipboard Control + Print
Copy window to clipboard Control + Alt + Print
Copy area to clipboard Shift + Control + Print
Toggle recording desktop Shift + Control + Alt + R

Print may have its own special label on your keyboard. On mine the Print key is labeled PrtSc.

Testing Network Connectivity

A handy little script:

#!/bin/bash

if nc -zw1 pfSense 443
then
  echo "We have DNS..."
else
  echo "NOPE!  No DNS..."
  sudo systemctl restart systemd-resolved
  exit
fi

Uses netcat (nc) to simply check if the router (pfsense) is currently findable by name & responding to HTTPS (port 443).

Then either tells you if it's OK or asks for your password to restart the DNS resolver.

Some other tips...

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