You can use mediainfo to investigate if the file has already a cover image.
˜ mediainfo mysong.mp3
The you can add a cover image to the file without reencoding it by ffmpeg. Use a 300×300 pixel image no larger than 500kB in JPEG format with moderate compression.
˜ ffmpeg -i sng.mp3 -i img.jpg -map_metadata 0 -map 0 -map 1 -acodec copy out.mp3
An easy to remember command line:
˜ wodim CD.iso
It will use some defaults and try to guess your drive, which is fine in most cases. That way you only need to set other options, like speed, if you really need to.
Using image magic you can take a screenshot from the command line similarly to plan 9 (slightly, at least philosophically)
˜ magick import -window root screen.png
set you nickname
˜ /set nick yourNickNameHere
connect and disconnect from a server
˜ /connect sevreNameHere ˜ /diconnect
join and leave a channel
˜ /join channel name here ˜ /leave
marking as being away
˜ /away someTextHere
when back simply use the same command without comment to reset the status.
moving between open windows or chats
˜ ctrl+n
to comment on what you are doing in the chat
˜ /me theThingYouaAreDoing
to answer to a specific user type the username and tab complete it, the write the message
˜ sudo apt install ubuntustudio-audio linux-lowlatency
when unrar is not available use bsdtar which is art of libarchive-tools in alpine Linux
˜ doas apk add libarchive-tools ˜ bsdtar -xf file.rar
for zip files and also tgz files
˜ 7z x file.zip ˜ 7z x file.tgz
use the ilbmtoppm file converter fro the netpbm package. for Alpine
˜ doas apk add netpbm ˜ ilbmtoppm file.lbm > file.ppm
check you IP
˜ ip address
scan network for connected ip/hostname
˜ nmap -sn 192.168.1.0/24
This will show you which hosts responded to ping requests on the network between 192.168.1.0 and 192.168.1.255. You will need to install nmap.
˜ stat flename
˜ ncftp -u USER ftp.server.com
To find the 10 biggest folders in current directory:
˜ du -h | sort -hr | head -n 10
To find the 10 biggest files and folders in current directory:
˜ du -ah | sort -hr | head -n 10
˜ echo "Hello, my name is Max Hedron."|espeak
Check memory speed and bank details
˜ sudo lshw -c memory
˜ update zsh: omz update
if you would like to serve the website go to the root directory and launch
˜ python3 -m http.server
Ubuntu Linux sets the keyboard parameters in the file /etc/default/keyboard. You can set the content manually in /etc/default/keyboard:
˜ XKBMODEL="macintosh" ˜ XKBLAYOUT="ch" ˜ XKBVARIANT="de_mac" ˜ XKBOPTIONS="lv3:alt_switch"
˜ BACKSPACE="guess"
create the log file:
˜ touch sync-script.log
create the following sync-script.sh file
˜ #!/bin/sh ˜ rsync -acu --delete ~/sample/source/ ~/sample/target/ >> ˜ ~/sync-script.log
render it executable
˜ chmod +x sync-script.sh
add it to the crontab by open it in edit mode
˜ crontab -e
and adding
˜ */1 * * * * /bin/sh ~/sync-script.sh >> ~/sync-job.log 2>&1
List crontab
˜ crontab -l
Edit crontab
˜ crontab -e
To monitor a file content (text mostly) and print updates to the screen use
˜ tail -f file
˜ df -h -> for drives ˜ du -h -> for current dir
-h gives the site on Mb Gb etc
˜ sudo mount -t cifs -o ˜ username=host_user,uid=local_user,gid=local_group //IP/host /dest
Don't forget to install key and cifs utils
˜ sudo apt install keyutils cifs-utils
Some Cisco clients provided by some institutions still need libbwebkit2gtk-4.0 which is no more available in Ubuntu 24.x (here they use v4.1+) to install it anyways you need to add the old source lists, update apt and install. It is recommended that you remove (or comment out the source after and update apt again. Note that form Ubuntu 24.x the distro sources have been moved from /etc/apt/sources.list, but this file will be still read when updating.
˜ echo 'deb http://gb.archive.ubuntu.com/ubuntu jammy main' >> /etc/apt/sources.list ˜ sudo apt update ˜ sudo apt install libwebkit2gtk-4.0-37
Cisco secure client should now run the connecting to vpn.fhnw.ch
˜ gtk-launch com.cisco.secureclient.gui
cd into the directory containing the HTML files, preferably also with an index.html
˜ python3 -m http.server
create a file .zlogin or .bash_login in your home directory and add you stuff there.
The following is an example on how to install blender form the tar file downloaded form the official website. Extract the tar to the location you want the create a simlink to a location which is in the PATH, for example
˜ sudo ln -s EXECUTABLE_DIR/blender ~/.local/bin
Then, copy app icon provided by blender to local folder, so your system can find it
˜ mkdir -p ~/.local/share/icons && cp blender.svg ~/.local/share/icons
If the local icons folder does not exist out-of-the-box. Just in case, use mkdir command with -p option to try creating it. Finally, copy (or move) the blender.desktop file (also provided by blender) into .local/share/applications directory:
˜ cp blender.desktop ~/.local/share/applications
And run update-desktop-database to apply, log out and in again. After that, your system can read this .desktop file, and show app icon in menu.
Install the tools
˜ sudo apt install ecryptfs-utils cryptsetup
Create a additional super user
˜ sudo adduser encryption_user ˜ sudo usermod -aG sudo encryption_user
logout and into the new user, do NOT reboot. check if you can access the home folder of the user (here winnie) you want to encrypt.
˜ sudo ls -l ~winnie
Start the encryption (passphrase is the password of winnie)
˜ sudo ecryptfs-migrate-home -u winnie
logout and in to winnie, doe NOT reboot. A window soul pop up. First however check if you can write to the new folder ~winnie (the encryption made a copy of the non encrypted folder ~winnie.
˜ vim ~winnie/hello.txt ˜ cat hello.txt
Now in the pup up click on "Run this action" if there was no pup up then
˜ ecryptfs-unwrap-passphrase
Provide winnie's password. check the passphrase$
˜ sudo ecryptfs-unwrap-passphrase
copy and save it on a secure place. Now encrypt the swap. Check of you have one
˜ swapon -s ˜ free -h
now encrypt it
˜ sudo ecryptfs-setup-swap
Now clean up, i.e. remove user, remove not encrypted home
˜ sudo deluser –remove-home encryption_user
˜ sudo rm -Rf /home/winnie.
check if you encrypted all. For the home folder check if you have these files
˜ la ~ | grep .ecryptfs ˜ la ~ | grep .Private
For the swap check if the answer to the following command contains cryptswap
˜ sudo blkid | grep swap