#ziktips — Public Fediverse posts

💡 TIP: Control and quickly adjust your audio output volume directly from the Linux command line using "wpctl" (WirePlumber Control CLI). You do not need to look up the default sink ID. Just use the built-in @DEFAULT_AUDIO_SINK@ alias:

wpctl set-volume @DEFAULT_AUDIO_SINK@ 40%

Verify:

wpctl get-volume @DEFAULT_AUDIO_SINK@
Volume: 0.40

NB. On PipeWire-based Linux systems like @fedora @opensuse etc

#ZikTIPS #Linux #LinuxTips #PipeWire #WirePlumber #CommandLine #CLI #OpenSource #FOSS #SysAdmin

💡 TIP: Control and quickly adjust your audio output volume directly from the Linux command line using "wpctl" (WirePlumber Control CLI). You do not need to look up the default sink ID. Just use the built-in @DEFAULT_AUDIO_SINK@ alias:

wpctl set-volume @DEFAULT_AUDIO_SINK@ 40%

Verify:

wpctl get-volume @DEFAULT_AUDIO_SINK@
Volume: 0.40

NB. On PipeWire-based Linux systems like @fedora @opensuse etc

#ZikTIPS #Linux #LinuxTips #PipeWire #WirePlumber #CommandLine #CLI #OpenSource #FOSS #SysAdmin

💡 TIP: On a Linux system using bash, you can compare text strings without worrying about upper or lowercase by using the ,, (lowercase) or ^^ (uppercase) parameter expansion modifiers e.g.

EDITION=CommUNITY

if [[ ${EDITION,,} = community ]]; then
echo "Community"
fi

${EDITION,,} converts the value to lowercase.

@opensuse @fedora @debian
#ZikTIPs #bash #scripting #linuxtips #techtips #feditips #Linux #opensource

💡 TIP: On a Linux system using bash, you can compare text strings without worrying about upper or lowercase by using the ,, (lowercase) or ^^ (uppercase) parameter expansion modifiers e.g.

EDITION=CommUNITY

if [[ ${EDITION,,} = community ]]; then
echo "Community"
fi

${EDITION,,} converts the value to lowercase.

@opensuse @fedora @debian
#ZikTIPs #bash #scripting #linuxtips #techtips #feditips #Linux #opensource

TIP: 💡Check the remaining battery level for your connected bluetooth device on a typical Linux system using the following command:

bluetoothctl info AA:BB:CC:DD:00:11 | awk '/Battery Percentage:/ {print $4}' | tr -d '()'

* Replace "AA:BB:CC:DD:00:11" with the MAC address of your bluetooth device

@openSUSE  @fedora @debian  #ZikTIPS #Bluetooth #Audio #TechTips #SysAdmin #LinuxTips #CLI #OpenSUSE #Fedora #Debian #Linux #opensource

TIP: 💡Check the remaining battery level for your connected bluetooth device on a typical Linux system using the following command:

bluetoothctl info AA:BB:CC:DD:00:11 | awk '/Battery Percentage:/ {print $4}' | tr -d '()'

* Replace "AA:BB:CC:DD:00:11" with the MAC address of your bluetooth device

@openSUSE  @fedora @debian  #ZikTIPS #Bluetooth #Audio #TechTips #SysAdmin #LinuxTips #CLI #OpenSUSE #Fedora #Debian #Linux #opensource

💡 On a typical Linux system, you can find bluetooth devices that are paired, connected, and trusted using the following command line:

bluetoothctl devices [ Paired | Connected | Trusted ]

For example: List currently paired bluetooth devices:

$ bluetoothctl devices Paired

Device 00:42:XX:YY:ZZ:YY XXBK85
Device 00:FD:AA:XX:YY:X8 D-26

@opensuse @fedora @debian #ZikTIPS #TechTips #SysAdmin #LinuxTips #CLI #OpenSUSE #Fedora #Debian #Linux #opensource

💡 On a typical Linux system, you can find bluetooth devices that are paired, connected, and trusted using the following command line:

bluetoothctl devices [ Paired | Connected | Trusted ]

For example: List currently paired bluetooth devices:

$ bluetoothctl devices Paired

Device 00:42:XX:YY:ZZ:YY XXBK85
Device 00:FD:AA:XX:YY:X8 D-26

@opensuse @fedora @debian #ZikTIPS #TechTips #SysAdmin #LinuxTips #CLI #OpenSUSE #Fedora #Debian #Linux #opensource

For anyone interested in using Kea DHCP server on buildroot, I have submitted a new package patch that is currently awaiting upstream review. You can check it out here:

https://patchwork.ozlabs.org/project/buildroot/patch/[email protected]/

@iscdotorg
#ZikTIPS #buildroot #dhcp #networking #linux #opensource

For anyone interested in using Kea DHCP server on buildroot, I have submitted a new package patch that is currently awaiting upstream review. You can check it out here:

https://patchwork.ozlabs.org/project/buildroot/patch/[email protected]/

@iscdotorg
#ZikTIPS #buildroot #dhcp #networking #linux #opensource

💡 Calculate the number of days since a given date (e.g. 30 June 2025) on a Linux system:

echo $(( ( $(date +%s) - $(date -d "2025-06-30" +%s) ) / 86400 ))

@opensuse @fedora @debian #ZikTIPs #Linuxtips #LinuxTechTips #Linux #FOSS #Opensource

💡 Calculate the number of days since a given date (e.g. 30 June 2025) on a Linux system:

echo $(( ( $(date +%s) - $(date -d "2025-06-30" +%s) ) / 86400 ))

@opensuse @fedora @debian #ZikTIPs #Linuxtips #LinuxTechTips #Linux #FOSS #Opensource

💡Did you know you can just run the mount command with -m flag to create a non-existent mount point instead of first creating it.

e.g. mount -m /dev/sdc1 /myflash

#ZikTIPs #linuxtips #techti #Linux #OpenSource

💡Did you know you can just run the mount command with -m flag to create a non-existent mount point instead of first creating it.

e.g. mount -m /dev/sdc1 /myflash

#ZikTIPs #linuxtips #techti #Linux #OpenSource

💡 It's conference 🎤 season! Impress your audience with a slick QR code using these easy commands on Linux

✅ Add your content to a text file:
printf " Name: Zik Joseph\n Blog: https://zikusooka.com \n" > my_contacts.txt

✅ Convert text file (and contents) into QR code image:
qrencode -o zik.png -r my_contacts.txt

Thats all! Add zik.png to your slides. Easy, classy.

#ZikTIPS #TechTips #LinuxTips #Conference #Linux #FOSS #OpenSource

💡 It's conference 🎤 season! Impress your audience with a slick QR code using these easy commands on Linux

✅ Add your content to a text file:
printf " Name: Zik Joseph\n Blog: https://zikusooka.com \n" > my_contacts.txt

✅ Convert text file (and contents) into QR code image:
qrencode -o zik.png -r my_contacts.txt

Thats all! Add zik.png to your slides. Easy, classy.

#ZikTIPS #TechTips #LinuxTips #Conference #Linux #FOSS #OpenSource

💡 Use the following command line to generate a list of security advisories on Fedora and RedHat Linux based systems #ZikTIPs #TechTips #Fedora #Redhat #Linux #Security #Opensource
@fedora @redhat

sudo dnf advisory list

💡 Use the following command line to generate a list of security advisories on Fedora and RedHat Linux based systems #ZikTIPs #TechTips #Fedora #Redhat #Linux #Security #Opensource
@fedora @redhat

sudo dnf advisory list

If you’re like me and enjoy watching streams or listening to multiple audio sources, check out my newly updated @pipewire based script! It makes muting or unmuting sound from different sources really easy.

Find it here:
https://github.com/zikusooka/toggle-pw-volumes
Context: https://joseph.zikusooka.com/?p=2637

#ZikTIPs #Linux #PipeWire #Multimedia

If you’re like me and enjoy watching streams or listening to multiple audio sources, check out my newly updated @pipewire based script! It makes muting or unmuting sound from different sources really easy.

Find it here:
https://github.com/zikusooka/toggle-pw-volumes
Context: https://joseph.zikusooka.com/?p=2637

#ZikTIPs #Linux #PipeWire #Multimedia

Cheat sheet: How to easily manage your packages using the Zypper command line tool on #OpenSUSE #Linux @opensuse #techtips #ZikTIPS

https://en.opensuse.org/images/3/30/Zypper-cheat-sheet-2.pdf

Cheat sheet: How to easily manage your packages using the Zypper command line tool on #OpenSUSE #Linux @opensuse #techtips #ZikTIPS

https://en.opensuse.org/images/3/30/Zypper-cheat-sheet-2.pdf

💡Use iperf3 to measure the network throughput between two Linux nodes effortlessly as follows: @fedora @opensuse

On server: iperf3 -s

On client: iperf3 -c <SERVER_IP>

#ZikTIPS #Linuxtips $Networking #LinuxTechTips #Linux #Opensource

💡Use iperf3 to measure the network throughput between two Linux nodes effortlessly as follows: @fedora @opensuse

On server: iperf3 -s

On client: iperf3 -c <SERVER_IP>

#ZikTIPS #Linuxtips $Networking #LinuxTechTips #Linux #Opensource

💡 Record audio from a microphone on a Linux system using gstreamer @gstreamer @fedora @opensuse @archlinux

gst-launch-1.0 alsasrc ! audioconvert ! lamemp3enc ! filesink location=recorded.mp3

#ZikTIPs #pipewire #pulseaudio #techtips #Linuxtips #LinuxTechTips #Linux #Opensource

💡 Record audio from a microphone on a Linux system using gstreamer @gstreamer @fedora @opensuse @archlinux

gst-launch-1.0 alsasrc ! audioconvert ! lamemp3enc ! filesink location=recorded.mp3

#ZikTIPs #pipewire #pulseaudio #techtips #Linuxtips #LinuxTechTips #Linux #Opensource

💡On a Linux system, use the "nohup" utility to execute one-time commands or scripts that can run later, even after you log out of your terminal session @opensuse
@fedora @debian

Example: To schedule a one-time script to run 15 minutes after you disconnect from the terminal:

nohup bash -c "(sleep 900 && ./myscript.sh)" &

#ZikTIPS #linuxtips #techtips #sysadmin #Fedora #OpenSUSE #Linux #Opensource

💡On a Linux system, use the "nohup" utility to execute one-time commands or scripts that can run later, even after you log out of your terminal session @opensuse
@fedora @debian

Example: To schedule a one-time script to run 15 minutes after you disconnect from the terminal:

nohup bash -c "(sleep 900 && ./myscript.sh)" &

#ZikTIPS #linuxtips #techtips #sysadmin #Fedora #OpenSUSE #Linux #Opensource

💡 Use the following Linux command to create a file with a specific access and modification timestamp @fedora @opensuse @archlinux

touch -t [FILE]

e.g. For a file named mytalk.txt March 10, 2025 at 9AM:

touch -t 202503100900 mytalk.txt

To verify:
stat -c "%x%y" mytalk.txt.

#ZikTIPs #Linuxtips #LinuxTechTips #Linux #Opensource

💡 Use the following Linux command to create a file with a specific access and modification timestamp @fedora @opensuse @archlinux

touch -t [FILE]

e.g. For a file named mytalk.txt March 10, 2025 at 9AM:

touch -t 202503100900 mytalk.txt

To verify:
stat -c "%x%y" mytalk.txt.

#ZikTIPs #Linuxtips #LinuxTechTips #Linux #Opensource

💡 You can simultaneously query multiple domain name records using the dig command in Linux as follows:

dig OPTIONS @server -f BATCH_FILE

Example:
dig +nocmd +noquestion +nostats +nocomments @8.8.8.8 -f mydomains.txt

cat mydomains.txt
example.com A
example.net MX
example.org NS

TIP: dig is part of the dns/bind utilities package depending on your distribution

#ZikTIPS #DNS #Bind #SysAdmins #CLI #Linux #Opensource

💡 You can simultaneously query multiple domain name records using the dig command in Linux as follows:

dig OPTIONS @server -f BATCH_FILE

Example:
dig +nocmd +noquestion +nostats +nocomments @8.8.8.8 -f mydomains.txt

cat mydomains.txt
example.com A
example.net MX
example.org NS

TIP: dig is part of the dns/bind utilities package depending on your distribution

#ZikTIPS #DNS #Bind #SysAdmins #CLI #Linux #Opensource

💡 To display a full list of known users on a Linux system, use the following command @fedora @opensuse @debian @ubuntu

lslogins

#ZikTIPS #Sysadmin #CLI #Fedora #OpenSUSE #Linux #opensource #TipsTech

💡 To display a full list of known users on a Linux system, use the following command @fedora @opensuse @debian @ubuntu

lslogins

#ZikTIPS #Sysadmin #CLI #Fedora #OpenSUSE #Linux #opensource #TipsTech

🎉 Excited to share HASS Core Installer, a tool that simplifies installing and upgrading Home Assistant Core in a Python 3 virtual environment! @homeassistant @jambulatv @jambula

🚀 Works online & offline, complementing existing methods for diverse setups.

🥦 Check it out on GitHub:
https://github.com/zikusooka/hass-core-installer

#HomeAssistant #SmartHome #ZikTIPs #Linux #opensource

🎉 Excited to share HASS Core Installer, a tool that simplifies installing and upgrading Home Assistant Core in a Python 3 virtual environment! @homeassistant @jambulatv @jambula

🚀 Works online & offline, complementing existing methods for diverse setups.

🥦 Check it out on GitHub:
https://github.com/zikusooka/hass-core-installer

#HomeAssistant #SmartHome #ZikTIPs #Linux #opensource

💡To display the DHCP IPv4 options assigned to a Linux client, use the following command line @opensuse @fedora @NetworkManager #ZikTIPs #CLI #Networking #Linux #OpenSource

nmcli -f DHCP4 device show "$INTERFACE"

e.g. nmcli -f DHCP4 device show eth0

💡To display the DHCP IPv4 options assigned to a Linux client, use the following command line @opensuse @fedora @NetworkManager #ZikTIPs #CLI #Networking #Linux #OpenSource

nmcli -f DHCP4 device show "$INTERFACE"

e.g. nmcli -f DHCP4 device show eth0

💡 Use the 'lsof' command to quickly identify the ports that a specific service is listening on within a Linux system @opensuse @fedora @climagic

Example:
SERVICE=sshd; lsof -i -P -n | grep $SERVICE | awk '/LISTEN/ {print $9}' | uniq

#ZikTIPs #SysAdmins #Linux #Opensource

💡 Use the 'lsof' command to quickly identify the ports that a specific service is listening on within a Linux system @opensuse @fedora @climagic

Example:
SERVICE=sshd; lsof -i -P -n | grep $SERVICE | awk '/LISTEN/ {print $9}' | uniq

#ZikTIPs #SysAdmins #Linux #Opensource

💡 Use the following command to quickly check how much space you have left on your Linux filesystem
@opensuse @fedora @debian #ZikTIPs #Linux #CLI #Opensource #linux

df -h --output=avail /

💡 Use the following command to quickly check how much space you have left on your Linux filesystem
@opensuse @fedora @debian #ZikTIPs #Linux #CLI #Opensource #linux

df -h --output=avail /

💡 If you have SELinux enabled on your Linux system, you can view the context of an object as follows @opensuse @fedora #ZikTIPS #Sysadmin #SELinux #CLI #OpenSUSE #Linux

For a file:
ls -Z [FILE] e.g.
ls -Z /etc/selinux/config

For a process:
ps -eZ | grep [PROCESS_NAME] e.g.
ps -eZ | grep apache2

💡 If you have SELinux enabled on your Linux system, you can view the context of an object as follows @opensuse @fedora #ZikTIPS #Sysadmin #SELinux #CLI #OpenSUSE #Linux

For a file:
ls -Z [FILE] e.g.
ls -Z /etc/selinux/config

For a process:
ps -eZ | grep [PROCESS_NAME] e.g.
ps -eZ | grep apache2

💡Get the inode number of a file using this simple command line on Linux @opensuse @fedora @archlinux

ls -i [FILENAME] e.g.

ls -i /etc/fstab

#ZikTIPs #CLI #Fedora #OpenSUSE #Debian #Linux #opensource

💡Get the inode number of a file using this simple command line on Linux @opensuse @fedora @archlinux

ls -i [FILENAME] e.g.

ls -i /etc/fstab

#ZikTIPs #CLI #Fedora #OpenSUSE #Debian #Linux #opensource

💡 Display a list of all users on a Linux system using the following command @opensuse @fedora @ubuntu #ZikTIPs #CLI #Fedora #OpenSUSE #Ubuntu #Linux #opensource

getent passwd | cut -d ":" -f1

💡 Display a list of all users on a Linux system using the following command @opensuse @fedora @ubuntu #ZikTIPs #CLI #Fedora #OpenSUSE #Ubuntu #Linux #opensource

getent passwd | cut -d ":" -f1

💡 Quickly inspect the contents of a systemd unit file in Linux using the following command #ZikTIPS #CLI #Fedora #Ubuntu #Linux #Opensource
@opensuse @fedora @debian

systemctl cat [UNIT] e.g.

systemctl cat sshd.service

💡 Quickly inspect the contents of a systemd unit file in Linux using the following command #ZikTIPS #CLI #Fedora #Ubuntu #Linux #Opensource
@opensuse @fedora @debian

systemctl cat [UNIT] e.g.

systemctl cat sshd.service

💡Display the active WiFi connection using the following command in Linux #ZikTIPs #CLI #WiFi #Linux #Opensource
@NetworkManager @opensuse @fedora @debian

nmcli connection show --active

NOTE: Works on distributions that use #networkmanager

💡Display the active WiFi connection using the following command in Linux #ZikTIPs #CLI #WiFi #Linux #Opensource
@NetworkManager @opensuse @fedora @debian

nmcli connection show --active

NOTE: Works on distributions that use #networkmanager

💡️On a Linux system, you can retrieve logging information for a specific service within a designated date range
#ZikTIPS #CLI #Systemd #Linux #Opensource @fedora @opensuse

journalctl -u [UNIT] -S [DATE-START] -U [DATE-END]

e.g.
journalctl -u sshd -S 2024-10-04 -U 2024-10-12

💡️On a Linux system, you can retrieve logging information for a specific service within a designated date range
#ZikTIPS #CLI #Systemd #Linux #Opensource @fedora @opensuse

journalctl -u [UNIT] -S [DATE-START] -U [DATE-END]

e.g.
journalctl -u sshd -S 2024-10-04 -U 2024-10-12

💡 Search for webcams on a Linux system using the following command line @fedora @opensuse #ZikTIPS #Linux #CLI #Multimedia #Video #Audio #Opensource

v4l2-ctl --list-devices

💡 Search for webcams on a Linux system using the following command line @fedora @opensuse #ZikTIPS #Linux #CLI #Multimedia #Video #Audio #Opensource

v4l2-ctl --list-devices

💡️ Display the actual target path of a symbolic link in Linux
#ZikTIPs #CLI #Linux #Opensource

readlink -f [LINK]

💡️ Display the actual target path of a symbolic link in Linux
#ZikTIPs #CLI #Linux #Opensource

readlink -f [LINK]

💡️Quickly change the bluetooth name advertised by your Linux device such as a raspberrypi @debian @opensuse @fedora

bluetoothctl system-alias "NEW-NAME"

#ZikTIPs #Bluetooth #Raspberrypi #Linux #Opensource

💡️Quickly change the bluetooth name advertised by your Linux device such as a raspberrypi @debian @opensuse @fedora

bluetoothctl system-alias "NEW-NAME"

#ZikTIPs #Bluetooth #Raspberrypi #Linux #Opensource