Convert all wav files to flac files in a folder
for i in *.wav; do ffmpeg -i "$i" "$i".flac ; done
for i in *.wav; do ffmpeg -i "$i" -acodec mp3 -ab 320k "$i".mp3 ; done
for i in *.flac; do ffmpeg -i "$i" -af aresample=dither_method=triangular -sample_fmt s16 -ar 44100 "$i".flac ; done
for f in *.flac; do flac -cd "$f" | lame -b 320 - "${f%.*}".mp3; done
for i in *.mp4; do ffmpeg -i "$i" -vcodec libx265 -crf 28 "${i%.*}_compressed.mp4"; done
for i in *.mov; do ffmpeg -i "$i" -vcodec libx265 -crf 28 "${i%.*}_compressed.mp4"; done
sudo apt install libheif-examples for file in *.heic; do heif-convert "$file" "${file/%.heic/.jpg}"; done
totem "$(ls -R | shuf -n1)"
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \ -dNOPAUSE -dQUIET -dBATCH -dDetectDuplicateImages \ -dCompressFonts=true -r150 -sOutputFile=output.pdf input.pdf
Summary of -dPDFSETTINGS:
dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs. (150 dpi)dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output fileAfter upgrading to Ubuntu 22.04 I had some issue to read some video files (Totem crash at startup, display the error "The specified movie could not be found" or open the video with a strange format. I did install the Intel non-free drivers to solve this issue:
sudo apt install intel-media-va-driver-non-free ubuntu-restricted-extras
# remove lrc files find -type f -name "*.lrc" -delete # remove .DS_Store files find -type f -name ".DS_Store" -delete
fdupes -rdN .
tar -zxvf file.tar.gz
tar -xvjf file.tar.bz2
find . -type d -delete
find . -iname "*.mp3" -print
curl -4 -o /dev/null http://bouygues.testdebit.info/100M.iso
curl -o /tmp/temp.iso https://bouygues.testdebit.info/100M.iso curl -4 -o /dev/null -F "filecontent=@/tmp/temp.iso" http://bouygues.testdebit.info
host myip.opendns.com resolver1.opendns.com
sudo netstat -antp
who
sudo slay user_name
sudo ufw status verbose
sudo iftop -i enp9s0
ssh user@host -XC application
ftpasswd --passwd --name=bob --uid=1001 --home=/home/bob --shell=/bin/false
ncftp -u username -p apssword ftp://ftpperso.free.fr/dir/
sudo ncftpput -R -u username ftpperso.free.fr / /dir_to_copy/*
sudo lshw | more
sudo dmidecode
sudo lscpu
upower -i /org/freedesktop/UPower/devices/battery_BAT0
wavemon
sudo glances --enable-plugin sensors
cpufreq-info
sudo journalctl --since "2023-01-01" | grep temperature
sudo powertop
sudo chkrootkit
sudo gt5
//check current kernel uname -r //check if list of old kernels is correct dpkg -l linux-{image,headers}-"[0-9]*" | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e '[0-9]' //purge old kernels dpkg -l linux-{image,headers}-"[0-9]*" | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e '[0-9]' | xargs sudo apt-get -y purge
sudo smartctl -A /dev/sda
sudo hdparm -y /dev/sdb
sudo hdparm -C /dev/sdb
sudo hdparm -B /dev/sdb
60 = 5x60 = (5 minutes)
sudo hdparm -B60 /dev/sdb
Install cifs/nfs
sudo apt install nfs-common sudo apt install cifs-utils
brsaneconfig4 -a name=(name your device) model=(model name) ip=xx.xx.xx.xx
Get SSH banned IP
fail2ban-client status sshd
tail -f access.log | goaccess -
goaccess access.log
zcat -f access.log* | goaccess -
sed -n '/'$(date '+%d\/%b\/%Y' -d 'last week')'/,$ p' access.log | goaccess -a - sed -n '/'$(date '+%d\/%b\/%Y' -d 'last month')'/,$ p' access.log | goaccess -a - sed -n '/'$(date '+%d\/%b\/%Y' -d '1 month ago')'/,$ p' access.log | goaccess -a - sed -n '/'$(date '+%d\/%b\/%Y' -d '1 week ago')'/,$ p' access.log | goaccess -a - sed -n '/'$(date '+%d\/%b\/%Y' -d 'yesterday')'/,$ p' access.log | goaccess -a - sed -n '/'$(date '+%d\/%b\/%Y' -d 'today')'/,$ p' access.log | goaccess -a -
goaccess access.log -o /var/www/html/report.html --log-format=COMBINED --real-time-html
awk '{print $9}' access.log | sort | uniq -c | sort -rn
cd /var/log/nginx/ awk '($9 ~ /404/)' access.log | awk '{print $7}' | sort | uniq -c | sort -rn
awk -F\" '($2 ~ /\.(jpg|gif)/ && $4 !~ /^https:\/\/eolienne\.f4jr\.org/){print $4}' access.log | sort | uniq -c | sort
awk '/Jan\/2024/ {print $1};' access.log | sort | uniq -c | sort -rn | head -20
awk 'BEGIN{ PROCINFO["sorted_in"]="@val_num_desc" } { a[$1]++; b[$1]+=$10 } END{ for(i in a) { if(++c>10) break; printf "IP: %s: ",i ; system(sprintf("numfmt --to=iec-i %s",b[i])) ; } }' access.log
sudo /usr/bin/mysql_secure_installation
sudo mysql -uroot -p GRANT LOCK TABLES, SELECT, RELOAD ON *.* TO 'backup'@'localhost' IDENTIFIED BY 'PASSWORD';
/etc/mysql/conf.d/mysqldump.cnf
mysql -p -u root CREATE DATABASE db_name; GRANT ALL PRIVILEGES ON db_name.* TO 'db_user'@'localhost' IDENTIFIED BY 'password' WITH GRANT OPTION;
mysql -p -u root -D db_name
SHOW TABLES ;
Installation of Airplay in Ubuntu 22.04 with Pulse Audio
# Airplay ability sudo apt install pulseaudio build-essential paprefs git pulseaudio-module-raop intltool libjack0 pavucontrol pulseaudio-module-zeroconf #bug pulseaudio sudo ln -s /usr/lib/pulse-16.1+dfsg1/ /usr/lib/pulse-16.1 pactl load-module module-raop-discover
Discover Airplay in Ubuntu 22.10 with PipeWire
sudo vi /etc/pipewire/pipewire.conf
Add the following line to load module inside the context.modules = [ section
{ name = libpipewire-module-raop-discover }
sudo apt install libdvdnav4 libdvdread4 gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly libdvd-pkg sudo dpkg-reconfigure libdvd-pkg sudo apt install ubuntu-restricted-extras
pihole -up
Move the Dock 'Show Applications' button at top
gsettings set org.gnome.shell.extensions.dash-to-dock show-apps-at-top true
Move the windows control button to the left
gsettings set org.gnome.desktop.wm.preferences button-layout 'close,minimize,maximize:'
Remove an IP address in case your IP address has been blocked by DSM firewall (Error message "IP Address blocked due to too many failed login attempts")
Login to your NAS using SSH with an admin group account
ssh user@192.168.x.x -p port_number
Once connected, get the root rights entering your password
sudo -i
Now remove the blocker IP address from the database
cd /etc sqlite3 synoautoblock.db sqlite> delete from AutoBlockIP where IP ="x.x.x.x";