simple-scripts

A collection of simple but useful Bash scripts so I don't have to remember the commands. Most scripts deal with .pdf or video file manipulation/conversion. Some scripts have become less "simple" over time as I add more functionality, but my goal is to make the code easy to understand over making it compact or efficient.

See LICENSE for details.

PDF Scripts

• djvu2pdf.sh
  • Convert .djvu to .pdf
  • Requires ddjvu
• ocr.sh
  • Perform optical character recognition (OCR) on an input image or PDF, output text to the console
  • Requires tesseract-ocr
• pdf2png.sh
  • Convert .pdf to a set of .pngs
• pdf2png2pdf.sh
  • Convert .pdf to .png and then back to .pdf
  • Useful for stripping hyperlinks and searchable text in PDFs
  • Requires imagemagick
• pdfcombine.sh
  • Combine multiple .pdf files into a single .pdf
  • Requires pdftk

Video Scripts

• avcomb.sh
  • Combine the audio stream of video 1 with the video stream of video 2
  • Requires ffmpeg
• crop-vid.sh
  • Crop a video with a given start and end time
  • Requires ffmpeg
• to-webm.sh
  • Converts a video container file (e.g. .mp4) to .webm format
  • Requires ffmpeg
• vid2avi.sh
  • Convert a compatible video container file to .avi while trying to maintain good quality
  • Requires ffmpeg

Other Scripts

• 2iso.sh
  • Converts a single file or folder into a .iso file
  • Requires mkisofs
• hashmd.sh
  • Calculates the checksum/hashes of all the files in a folder and generates a Markdown-style table of the results.
  • Requires libarchive-zip-perl
  • See an example of the tables generated here
• randstr.sh
  • Get 128 bytes of random data from /dev/urandom and print visible ASCII characters only
  • Passing -a makes only alpha-numeric characters print
  • Passing -A makes only alpha-numeric characters print, excluding O0lI
• sha256-check.sh
  • --check if the calculated SHA256 sum of file equals the provided SHA256 sum string
  • Saves you from making a formatted file with the sum and filename then running sha256sum --check ...
  • Usage: ./sha256-check.sh <file> <SHA-256-str>
• shredu.sh
  • Overwrites the specified file(s) with random data, then with all zeros, and then removes the file(s)
  • Has option to recursively shred all files in directory: -r
  • Uses the shred command
• upgrade.sh
  • Fetch and update packages; then remove old packages
  • Uses apt-get package manager
• zip-all.sh
  • Zip uncompressed files in a directory (depth=1) into their own ZIPs
  • Each file will be deleted after being successfully zipped
  • Usage: ./zip-all.sh <directory>
  • Requires 7zip
• zip-optimizer.sh
  • Recompress all the ZIP archives provided using the highest compression level
  • Replaces the original ZIP archive if space is saved
  • Prints the space saved per file and the total space saved at the end
  • Usage: ./zip-optimizer ...
  • Requires 7zip