Ubuntu settings

I don’t pretend to publish anything new or fundamental here. I have only started working with Linux, so this post is just my way of keeping notes, in order not to search the web again. If it turns out to be useful for somebody else, I will only be glad. These settings were made for Ubuntu 18.04 LTS.

Here’s the previous version for Ubuntu 16.04 LTS: Ubuntu16_settings.txt

============================ tmp directory in ramdrive ===================
sudo gedit /etc/fstab

tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,mode=1777,size=2048M 0 0

================== Google calendar to accept invitations in Thunderbird 60 ===================

- In Preferences > Advanced (Tab) > General (stealthy subtab) > Config Editor (Button)
- Search for "calendar.google.enableEmailInvitations" and ensure the property is set to true
- Go to the calendar you want to use with your email, right click it and select "Properties"
- Change the "Email" field to the account you want to process invites for
- Click "OK"
- Go to an email invitation and you should now see the accept and decline buttons.

============== Cyrillic characters in Windows archives ================
sudo apt-add-repository ppa:hanipouspilot/file-roller
sudo apt-get update
sudo apt-get install file-roller

===================== Enable Edit As Administrator =====================

sudo apt install nautilus-admin
sudo nautilus -q

======================= Create ramdisk and start Digicam with its DB on ramdisk ====================
sudo mkdir /mnt/ramdisk

/opt/digikam/start_with_ramdisk.sh :

pkexec mount -t tmpfs -o rw,size=512M tmpfs /mnt/ramdisk
cp -r -f /home/drew/Documents/digicam_db /mnt/ramdisk
sh /opt/digikam/AppRun
cp -r -f /mnt/ramdisk/digicam_db /home/drew/Documents
#pkexec umount /mnt/ramdisk
#the ramdisk will be unmounted after the next reboot

==================== Export OpenWRT router config ===============

ssh root@ "uci export" > router.conf

============== Update installed software ==========

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

#========================== Make Linux use 'Local' time ==========================
timedatectl set-local-rtc 1

#================ Set the grub timeout and the grub default boot entry ===========

sudo gedit /etc/default/grub
sudo update-grub

====================================== Mount NTFS partition in fstab =======================

sudo mkdir /media/d1
sudo mkdir /media/d2
sudo blkid
sudo gedit /etc/fstab
UUID=7020AE1B20ADE874 /media/d1 ntfs-3g permissions,windows_names,locale=en_US.utf8 0 0
UUID=00C0C2ECC0C2E6CE /media/d2 ntfs-3g permissions,windows_names,locale=en_US.utf8 0 0

sudo mount -a

#=================== Simple GUI adjustments ==========================
- Desktop backround solid color
- remove unneccessary icons from the launcher
- keyboard repeat delay: Settings > Universal Access > Typing > Repeat keys -- Speed setting works in inverse
- Nautilus Bookmarks: drag and drop
- Language Support + Regional Formats
- Shortcuts on desktop
- Time & Date settings -- 24 H
- Install LibreOffice and adjust settings (name, units)
- setup Thunderbird: Startup Applications
- login to Firefox
- Link colors in LibreOffice Calc: Tools > Options > LibreOffice > Application Colors > Text Document > Field Shading 

======================== Switch lang with Alt-Space =========================


sudo apt-get install gnome-tweaks
	Select Keyboard & Mouse tab
	Click Additional Layout Options button
	Expand Switching to another layout
gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['']"
gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward  "['']"
gsettings set org.freedesktop.ibus.general.hotkey triggers "['']"

======================== Enable Shell in Gnome tweaks =============

Enable ‘Shell theme’ in Gnome Tweak Tool in Ubuntu
=========== Install LibreOffice via PPA (snap version is slow) ======================= sudo add-apt-repository ppa:libreoffice/ppa sudo apt-get update sudo apt-get install libreoffice sudo apt-get install ppa-purge && sudo ppa-purge ppa:libreoffice/ppa ============== Install Thunderbird from PPA (snap version is old) ============== sudo add-apt-repository ppa:mozillateam/ppa sudo apt-get update sudo apt-get dist-upgrade sudo apt install thunderbird sudo apt-get install ppa-purge && sudo ppa-purge ppa:mozillateam/ppa ===================================================== ============ Laptop goes to sleep with lid closed before login and after logout =============== sudo gedit /etc/systemd/logind.conf Search for these lines and make them look like this (possibly by removing # in front or replacing suspend with ignore): HandleLidSwitch=ignore HandleLidSwitchDocked=ignore #============================= Disable password prompt in sudo (convenient but not secure -- do not forget to change it back!) ============================== #1. sudo visudo #Change: %sudo ALL=(ALL:ALL) ALL #to %sudo ALL=(ALL) NOPASSWD:ALL #2. sudo nano /etc/polkit-1/localauthority/50-local.d/99-nopassword.pkla [No password prompt] Identity=unix-group:sudo Action=* ResultActive=yes =============== Double Commander (snap version is old) ====================== sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/Alexx2000/xUbuntu_18.04/ /' > /etc/apt/sources.list.d/home:Alexx2000.list" wget -nv https://download.opensuse.org/repositories/home:Alexx2000/xUbuntu_18.04/Release.key -O Release.key sudo apt-key add - < Release.key sudo apt update sudo apt install doublecmd-gtk Configuration > Options -- "File views"->"Sorting directories"="sort like files and show first" Configuration > Options-Colors-File types Configuration > Options-Fonts-Main font Configuration > Options-Icons -- 16x16 Configuration > File views -- Show system and hidden files Configuration > Options > Behaviors > Drive black list: /home/ssh-ate/ATE;/home/ssh-ate/Dist;/home/ssh-ate/Dist-Work;/home/ssh-ate/Docs;/home/ssh-ate/ArchiveProjects;/home/ssh-ate/SupplierInfo;/home/ssh-ate/Lang;/home/ssh-ate/Music;/home/ssh-ate/Storage;/home/ssh-ate/video;/home/ssh-ate/inbox;/run/user/1000/gvfs;/media/user1/Win;*telegram-desktop.mnt;/run/snapd/ns*;/home/guests/Inbox-d2;/home/guests/video #==================== Install Notepadqq ================== sudo snap install --classic notepadqq #=================== Disable Gnome animation ========================= 0. Install Gnome Tweak Tool using Ubuntu Software 1. Appearance > Animations = Off =========================================== User groups ================================== sudo addgroup GROUP sudo adduser USERNAME GROUP groups USERNAME ================================= Share folder for Windows =============================== sudo apt-get install samba sudo useradd user2 sudo smbpasswd -a user2 sudo gedit /etc/hostname sudo gedit /etc/samba/smb.conf [global] usershare owner only = false workgroup = ATE and add to the end of the file: [d1] path = /media/d1 available = yes valid users = user1 read only = no browsable = yes public = yes writable = yes [d2] path = /media/d2 available = yes valid users = user1 read only = no browsable = yes public = yes writable = yes [User2] path = /media/d1/User2 available = yes valid users = user2 read only = no browsable = yes public = yes writable = yes [Pics] path = /media/d1/Pics available = yes valid users = user2 read only = no browsable = yes public = yes writable = yes path = /media/d2/video available = yes valid users = user2 read only = no browsable = yes public = yes writable = yes sudo gedit /etc/security/limits.conf add to the end: * - nofile 16384 root - nofile 16384 sudo service smbd restart ================================ Mount Windows Share ======================= https://ubuntuforums.org/showthread.php?t=2078120 sudo apt-get install cifs-utils sudo mkdir /media/user1/user1-pc-d sudo mkdir /media/user1/user1-pc-e sudo gedit ~/.smbcredentials username=msusername password=mspassword sudo chmod 600 ~/.smbcredentials sudo gedit /etc/fstab //user1-pc/d /media/user1/user1-pc-d cifs credentials=/home/user1/.smbcredentials,iocharset=utf8,sec=ntlm 0 0 //user1-pc/e /media/user1/user1-pc-e cifs credentials=/home/user1/.smbcredentials,iocharset=utf8,sec=ntlm 0 0 sudo mount -a =================== Install Skype ================================================= sudo -s cd ~/Downloads wget https://go.skype.com/skypeforlinux-64.deb dpkg -i skypeforlinux-64.deb rm skypeforlinux-64.deb =================== Install Viber -- not needed in latest version: replace libcurl3 with libcurl4 to avoid conficts with virtualbox ================================================= cd ~/Downloads wget http://download.cdn.viber.com/cdn/desktop/Linux/viber.deb dpkg-deb -x viber.deb viber dpkg-deb --control viber.deb viber/DEBIAN gedit ./viber/DEBIAN/control repace "libcurl3" with "libcurl4" dpkg -b viber vibernew.deb sudo dpkg -i vibernew.deb ============== Install Telegram ============= sudo snap install telegram-desktop ================ Install 7zip and rar =========================================== sudo apt-get update sudo apt-get install rar unrar sudo apt-get install p7zip-rar p7zip-full ================ Start Chrome with a certain profile ================ google-chrome --profile-directory=Default google-chrome --profile-directory="Profile 1" ========================== Install Canon Lide 120 scanner driver ========================== sudo add-apt-repository ppa:rolfbensch/sane-git sudo apt-get install simple-scan sane-utils libsane libsane-common libsane-extras sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade sudo apt-get -f install sudo gedit /lib/udev/rules.d/40-libsane.rules Add to the end: # Canon CanoScan Lide 120 ATTRS{idVendor}=="04a9", ATTRS{idProduct}=="190e", ENV{libsane_matched}="yes" Save, reboot, and run: sudo sane-find-scanner -v -v ========================== Install Canon LBP printer driver ========================== http://help.ubuntu.ru/wiki/canon_capt ========================== Install Java JRE or JDK ========================== sudo apt-get install default-jre sudo apt-get install default-jdk ========================== Java enabled browser ========================== palemoon ========================== Install Pulse Secure Client =================== cd ~/Downloads wget http://trial.pulsesecure.net/clients/ps-pulse-linux-5.3r3.0-b1021-ubuntu-debian-64-bit-installer.deb sudo dpkg -i ~/Downloads/ps-pulse-linux-5.3r3.0-b1021-ubuntu-debian-64-bit-installer.deb /usr/local/pulse/PulseClient_x86_64.sh install_dependency_packages ============ Disable Pidgin notifications =============== Ctrl-U -- Libnotify Popups -- Configure plugin ========================== Install Virtualbox 6.0.4 =================== cd ~/Downloads wget https://download.virtualbox.org/virtualbox/6.0.4/virtualbox-6.0_6.0.4-128413~Ubuntu~bionic_amd64.deb sudo dpkg -i ~/Downloads/virtualbox-6.0_6.0.4-128413~Ubuntu~bionic_amd64.deb wget https://download.virtualbox.org/virtualbox/6.0.4/Oracle_VM_VirtualBox_Extension_Pack-6.0.4-128413.vbox-extpack sudo virtualbox Oracle_VM_VirtualBox_Extension_Pack-6.0.4-128413.vbox-extpack sudo adduser $USER vboxusers In BIOS chage secure boot settings from “Windows UEFI” to “Other OS” and execute: modprobe vboxdrv =================== Install Teamviewer ============================= sudo apt-get install libqt5x11extras5 qtdeclarative5-controls-plugin qtdeclarative5-dialogs-plugin sudo apt-get -f install cd ~/Downloads wget https://download.teamviewer.com/download/linux/teamviewer_amd64.deb sudo dpkg -i ~/Downloads/teamviewer_amd64.deb https://download.teamviewer.com/download/linux/teamviewer_amd64.deb --------Login screen locked ---------------- sudo gedit /etc/gdm3/custom.conf WaylandEnable=false ============= Install Gnome panel (taskbar) also used for creating Desktop shortcuts (Launchers) through GUI ============ sudo apt update sudo apt install gnome-panel gnome-desktop-item-edit --create-new ~/Desktop OR gedit ~/Desktop/Chrome-home.desktop #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Exec=/usr/bin/google-chrome --profile-directory=Default Name=Chrome home Comment=Chrome home Icon=/opt/google/chrome/product_logo_256.png gedit ~/Desktop/Chrome-work.desktop #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Exec=/usr/bin/google-chrome --profile-directory="Profile 1" Name=Chrome work Comment=Chrome work Icon=/opt/google/chrome/product_logo_256.png Then allow execution in properties. ============== Sync folders -- Unison ============== Install from Ubuntu Software Run via launcher: /snap/unison-jz/19/bin/unison-2.51 -dontchmod -perms 0 Profiles stored at /home/user1/.unison/*.prf common.prf # Helps out a lot on Windows fastcheck = true # place new files at the top of the list sortnewfirst = true # turn on ssh compression rshargs = -C # Do not sync permissions dontchmod = true perms = 0 ignore = Name Thumbs.db ignore = Name *~ ignore = Name *.tmp ignore = Name _SYNCAPP ignore = Name metadata.xml unison profilename -batch ================== Windows software ================ - Dropbox -- Ubuntu Software - Draftsight (http://dl-ak.solidworks.com/nonsecure/draftsight/2018SP1/draftSight.deb) - text editor: notepadqq (regular expressions not working), Geany, SciTE - File manager -- Double Commander - FTP server -- OpenSSH - video player -- VLC, KM Player? - ultraISO -- UNetbootin + sudo apt-get install isomaster - photo manager -- digikam (alternatives: gThumb, KPhotoAlbum, Darktable, F-Spot, GTKRawGallery, Picty, Fotoxx) - ebook converter -- Calibre - audio capture -- Audio Recorder - audio editor -- Audacity - video capture (Screen recorder) -- Open Broadcaster Software (OBS) - video convert -- Handbrake (Selene?) - Video Editor -- Kdenlive - PDF Reader -- Evince ===================== Install Handbrake ============= sudo add-apt-repository ppa:stebbins/handbrake-releases sudo apt-get update sudo apt-get install handbrake-gtk sudo apt-get install handbrake-cli ==================== Install Selene =========== sudo apt-add-repository -y ppa:teejee2008/ppa sudo apt-get update sudo apt-get install selene =============== Install DraftSight ====================== cd ~/Downloads wget http://dl-ak.solidworks.com/nonsecure/draftsight/2018SP2/draftSight.deb sudo dpkg -i ~/Downloads/draftSight.deb ================ Install Audacity ================ sudo add-apt-repository ppa:ubuntuhandbook1/audacity sudo apt-get update sudo apt-get install audacity ============== Install Calibre ==================== sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()" ====================== Install Audio Recorder =============== sudo add-apt-repository ppa:audio-recorder/ppa sudo apt-get -y update sudo apt-get install --reinstall audio-recorder ========== Install digikam =============== sudo mkdir /opt/digikam sudo chown user1 /opt/digikam cd /opt/digikam wget https://download.kde.org/stable/digikam/digikam-5.9.0-01-x86-64.appimage sudo chmod 775 digikam-5.9.0-01-x86-64.appimage /opt/digikam/digikam-5.9.0-01-x86-64.appimage OR (not latest) sudo add-apt-repository ppa:philip5/extra sudo apt update sudo apt install digikam5 ================== Install RDP ================ https://askubuntu.com/questions/592537/can-i-access-ubuntu-from-windows-remotely sudo apt-get update sudo apt-get install xrdp sudo apt-get install xfce4 echo xfce4-session >~/.xsession sudo gedit /etc/xrdp/startwm.sh The content should look like this (pay attention to the last line and ignore . /etc/X11/Xsession): " #!/bin/sh if [ -r /etc/default/locale ]; then . /etc/default/locale export LANG LANGUAGE fi startxfce4 " sudo service xrdp restart ==================================== Mount shares inside vbox ============================== mkdir ~temp-shared sudo mount -t vboxsf temp temp-shared sudo nano /etc/rc.local sudo mount -t vboxsf temp /home/user1/temp-shared ====================== Install WCM Commander (but Double Commander recommended) ===================================== 1. http://wcm.linderdaum.com/downloads/ #OR the latest version using GIT source: 2.1 Goto https://github.com/corporateshark/WCMCommander/ 2.2 Download ZIP 2.3 Unpack 2.4 Install "Synaptic Package Manager" using "Ubuntu Software" 2.5 Using Synaptic, install packages : libX11-dev libfreetype6-dev libssh2-1-dev libsmbclient-dev 2.6 Run in WCMCommander-master make all -B sudo make install -d /usr/bin ================ Remote desktop via VNC =============== vino-preferences gsettings set org.gnome.Vino require-encryption false #and forward port 5900 on the router ================== Configure cron scheduled tasks =========== touch ~/cronjobs.txt gedit ~/cronjobs.txt 0 20 * * * /snap/unison-jz/13/bin/unison-2.51 Work-Backup -batch -dontchmod -perms 0 30 20 * * 5 sh ~/archive-work.sh touch ~/archive-work.sh gedit ~/archive-work.sh #!/bin/sh 7z a -pPASSWORD /media/d2/Inbox-d2/Backup/Work-$(date +%Y-%m-%d).7z /media/d1/Work > archive-work.log Make it hidden and executable: cmod 700 ~/archive-work.sh crontab -u user1 ~/cronjobs.txt crontab -l grep CRON /var/log/syslog ================= Install OpenVPN =============== sudo apt-get update sudo apt-get install openvpn sudo openvpn --config /media/d1/configfile.ovpn ============ Install OpenSSH ================= https://www.digitalocean.com/community/tutorials/how-to-enable-sftp-without-shell-access-on-ubuntu-16-04 https://en.wikibooks.org/wiki/OpenSSH/Cookbook/File_Transfer_with_SFTP#SFTP-only_Accounts sudo apt install openssh-server sudo mkdir -p /home/ssh-grp sudo chown user1:grp /home/ssh-grp sudo chgrp grp /home/ssh-grp sudo mkdir -p /home/ssh-grp/ftp-dir1 sudo mkdir -p /home/ssh-grp/ftp-dir2 sudo chown root /home/ssh-grp sudo gedit /etc/fstab /media/d1/FTP/dir1 /home/ssh-grp/ftp-dir1 none bind /media/d1/FTP/dir2 /home/ssh-grp/ftp-dir2 none bind sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.factory-defaults sudo gedit /etc/ssh/sshd_config Port NNN PermitRootLogin no Subsystem sftp internal-sftp #add to the end: Match user user1 ChrootDirectory /media ForceCommand internal-sftp PasswordAuthentication yes PermitTunnel no AllowAgentForwarding no AllowTcpForwarding no X11Forwarding no Match Group grp ChrootDirectory /home/ssh-grp ForceCommand internal-sftp PasswordAuthentication yes PermitTunnel no AllowAgentForwarding no AllowTcpForwarding no X11Forwarding no tail -f /var/log/auth.log sudo systemctl restart ssh ================= Hide users =============== printf "[User]\nSystemAccount=true" | sudo tee /var/lib/AccountsService/users/user1 > /dev/null =========== Firewall ============= https://www.digitalocean.com/community/tutorials/how-to-setup-a-firewall-with-ufw-on-an-ubuntu-and-debian-cloud-server sudo apt-get install ufw sudo ufw status sudo ufw app list sudo ufw default deny incoming sudo ufw default allow outgoing sudo ufw allow 11111/tcp sudo ufw deny OpenSSH sudo ufw allow Samba sudo ufw allow CUPS sudo ufw enable sudo ufw status =========== File permissions ======= http://manpages.ubuntu.com/manpages/xenial/en/man8/ntfs-3g.8.html
Ownership and Permissions
sudo chown -R user1:user1 /media/d1 sudo chmod -R u+rwX,g+rX,go-w,o-rX /media/d1 sudo chown -R user1:user1 /media/d2 sudo chmod -R u+rwX,g+rX,go-w,o-rX /media/d2 sudo chgrp -R ate /media/d1/dir1 sudo chgrp -R ate /media/d1/dir2 sudo chown -R user2:home /media/d1/dir3 sudo chmod -R g+w /media/d1/dir3 sudo chmod -R o+X /media/d1/dir3 sudo chmod -R g+w /media/d1/FTP/inbox ========================== Make ISO image ================= mkisofs -allow-lowercase -allow-multidot -J -joliet-long -jcharset utf-8 -o /media/d1/Pics/My_photo/Archive/2017.iso /media/d1/Pics/My_photo/2017/08-July ================ Download an offline website mirror, make and mount ISO image =============== sudo apt-get install webhttrack bash process_after_httrack.sh sudo mkdir /media/user1/iso sudo mount -o loop /media/d1/Stasia/offline-websites/doctorberezovska_com_2018-02-25.iso /media/user1/iso sudo umount /media/user1/iso -----------process_after_httrack.sh--------- #!/bin/bash source_path=/media/d2/Temp/HTTrack project_name=doctorberezovska_com temp_path=/media/d1/Temp iso_path=/media/d1/Stasia/offline-websites url_prefix=http:/ pagename=index.html basepath=$temp_path/$project_name cp -r $source_path/$project_name $temp_path rm -rf $basepath/hts-cache #delete all folders "feed" find $basepath -type d -name feed -exec rm -r {} \; #delete all files index????.html find $basepath -type f -name index????.html -exec rm -r {} \; find $basepath -type f -name index.html -size 0c > empty_indexes.txt #download empty index.html files while read -ru 3 LINE; do #replace basepath with http prefix in each line urlpath=${LINE/$basepath/$url_prefix} #delete index.html in each line urlpath=${urlpath/$pagename} wget -k --output-document="$LINE" $urlpath done 3< empty_indexes.txt find $basepath -type f -name *.html > all_html.txt while read -ru 3 LINE; do #Replace http://doctorberezovska.com/ with ../ #Some links are not replaced by HTTrack. This replacement will only work for level 1 pages, but they are the majority. A universal replacement is too complicated. #Also delete trash after sed -i 's_http://doctorberezovska.com/_../_g;/<\/html>/q' $LINE done 3< all_html.txt grep Error: $basepath/hts-log.txt >errors.txt rm -rf $basepath/hts-log.txt mkisofs -r -iso-level 4 -o $iso_path/$project_name"_"$(date +%Y-%m-%d).iso $basepath rm -rf $basepath ---------------------------------------------- ========================== Burn ISO e.g. ================ sudo fdisk -l sudo umount /dev/sdd sudo dd bs=4M if=/media/d1/Dist/Util/Hdd-tools/WinPE10_8_Sergei_Strelec/WinPE10_Sergei_Strelec_x64_2018.01.05_English_lite.iso of=/dev/sdd status=progress oflag=sync OR if bootable USB flash sudo add-apt-repository ppa:gezakovacs/ppa sudo apt-get update sudo apt-get install unetbootin sudo QT_X11_NO_MITSHM=1 /usr/bin/unetbootin ====================== SVN and Git GUI client ================= sudo add-apt-repository ppa:rabbitvcs/ppa sudo apt-get update sudo apt-get install rabbitvcs-cli rabbitvcs-core rabbitvcs-gedit rabbitvcs-nautilus rabbitvcs-nautilus3 sudo apt-get remove rabbitvcs* OR RapidSVN in UbuntuSoftware rep =========== Check existing application =============== /usr/share/applications ========== Download Youtube video ======== sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl sudo chmod a+rx /usr/local/bin/youtube-dl ============= Separate output audio devices for each app ============================ sudo apt-get install pavucontrol pavucontrol =============== Change display resolution ============== xrandr --output HDMI-1 --mode 1920x1200 xrandr --output HDMI-1 --mode 1920x1080 xrandr --output HDMI-1 --mode 1280x960 ========== Access Google Drive ========== GUI - https://www.omgubuntu.co.uk/2016/08/use-google-drive-ubuntu-16-04-linux-desktops Mount - https://www.techrepublic.com/article/how-to-mount-your-google-drive-on-linux-with-google-drive-ocamlfuse/ Mount - http://xmodulo.com/mount-google-drive-linux.html =============== On input source change the scroll lock toggles ======================= sudo gedit /etc/default/keyboard XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll" #XKBOPTIONS="grp:alt_shift_toggle" gsettings reset org.gnome.desktop.input-sources xkb-options ========================= Batch resize images recursively ================================= sudo apt-get update sudo apt-get install imagemagick -y OR (compile if needed) sudo apt-get install build-essential checkinstall && apt-get build-dep imagemagick -y cd ~/Downloads wget https://www.imagemagick.org/download/ImageMagick.tar.gz tar xf ImageMagick.tar.gz cd ImageMagick-7* ./configure make sudo make install sudo ldconfig /usr/local/lib find . -name '*.jpg' -execdir mogrify -resize 1920x1440 {} \; find . -name '*.JPG' -execdir mogrify -resize 1920x1440 {} \; find . -name "*.jpg" | xargs mogrify -resize 50% find . -name "*.JPG" | xargs mogrify -resize 50% find . -name '*.png' -execdir mogrify -format jpg {} \; find . -name '*.PNG' -execdir mogrify -format jpg {} \; ========== Disable MySQL from startup ========= sudo /etc/init.d/mysql stop sudo systemctl disable mysql sudo systemctl enable mysql sudo /etc/init.d/mysql start =============== Rename all .MP3 to .mp3 files =========== sudo apt install rename rename 's/.MP3$/.xxx/' *.MP3 rename 's/.xxx$/.mp3/' *.xxx ============ Randomize (shuffle) all .mp3 files ================= for f in *.mp3 *.MP3; do mv "$f" $RANDOM.mp3; done ==================== Batch rename files in text editor ================= sudo apt install renameutils qmv ================================ Clean up ========== sudo apt autoremove sudo apt-get autoremove sudo apt-get clean journalctl --vacuum-time=2d dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge sudo sh delete_old_snaps.sh #!/bin/bash # Removes old revisions of snaps # CLOSE ALL SNAPS BEFORE RUNNING THIS set -eu snap list --all | awk '/disabled/{print $1, $3}' | while read snapname revision; do snap remove "$snapname" --revision="$revision" done


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