useful linux commands.md

Useful Linux commands

Utility

• Compress a pdf file: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
• Resize a pdf file (e.g. from US letter) to A4: gs -o output.pdf -sDEVICE=pdfwrite -sPAPERSIZE=a4 -dFIXEDMEDIA -dPDFFitPage -dCompatibilityLevel=1.4 input.pdf
• Show a summary of the running hardware: inxi -Fxz
• Convert mp4 to gif: ffmpeg -i example.mp4 -r 15 -vf scale=512:-1 -ss 00:00:02 -to 00:00:06 example.gif
• Split video into smaller chunks: ffmpeg -i *.mp4 -c copy -map 0 -segment_time 00:02:00 -f segment -reset_timestamps 1 output_%03d.mp4

Git

• Submodule update: git submodule update --recursive --remote

Manjaro knowledge

• Restart network manager: systemctl restart NetworkManager.service
• Fix: Can not connect to internet!

  • Use dhcpcd instead of dhcp in NetworkManager.

  • Init/edit this file: sudo xed /etc/NetworkManager/conf.d/dhcp-client.conf

  • Then add:

    [main]
    dhcp=dhclient
    

• Remove title bar gap with maximized Firefox windows: Switch the Theme option for Window borders from Mint-Y-Dark to Adapta.