John's Linux blog

 #!/usr/bin/env bash # Usage: imagefolder_to_pdf.sh /path/to/folder # Creates folder.pdf from all images (JPG/PNG/etc) in that folder at 150 dpi. set -euo pipefail if [ "${1:-}" = "-h" ] || [ "$#" -lt 1 ]; then   echo "Usage: $(basename "$0") /path/to/folder" >&2   exit 1 fi indir="$1" # Strip trailing slash, then append .pdf foldername="$(basename "${indir%/}")" outfile="$(dirname "$indir")/${foldername}.pdf" if [ ! -d "$indir" ]; then   echo "Error: folder not found: $indir" >&2   exit 2 fi # Gather images mapfile -d '' files < <(   find "$indir" -maxdepth 1 -type f \     \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.tif' -o -iname '*.tiff' -o -iname '*.bmp' -o -iname '*.webp' \) \     -print0 | sort -z -V ) if [ "${#files[@]}" -eq 0 ]; then ...

 #!/bin/bash # usage: pdfrotate.sh <angle> <file.pdf> # Rotates all pages of a PDF using pdftk (for 90° increments) or Ghostscript otherwise. angle=$1 file=$2 if [ -z "$angle" ] || [ -z "$file" ]; then     echo "Usage: $0 <angle> <file.pdf>"     exit 1 fi base="${file%.pdf}" out="${base}_rotated_${angle}.pdf" # Round angle if needed norm_angle=$((angle % 360)) # Handle pdftk for standard rotations if [[ "$norm_angle" == "90" || "$norm_angle" == "180" || "$norm_angle" == "270" || "$norm_angle" == "0" ]]; then     case $norm_angle in         0)   dir="north" ;;   # no rotation         90)  dir="right" ;;         180) dir="down" ;;         270) dir="left" ;;     esac     echo "Rotating with pdftk ($norm_angle°)..."     pdftk "$file" cat 1-end${dir} output "$out" else  ...

 #!/bin/bash # convert_and_transcribe.sh # 1. Rename spaces to underscores for f in *\ *; do mv "$f" "${f// /_}"; done # 2. Convert all .m4a files to .mp3 for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -ab 192k "${f%.m4a}.mp3"; done # 3. Move original .m4a files to Trash mv *.m4a ~/.local/share/Trash/files/ 2>/dev/null # 4. Transcribe all .mp3 files using Whisper for f in *.mp3; do whisper "$f" --model medium --language en --output_format txt --output_dir . --fp16 False; done

#!/usr/bin/env bash # rename_youtube_clean.sh for f in *; do   [ -f "$f" ] || continue   case "$f" in *.sh) continue;; esac   new="$(printf '%s' "$f" |     tr -cd '\0-\177' |     sed -E '       s/\([^)]*\)//g;            # drop (...)       s/\[[^]]*\]//g;            # drop [...]       s/[⧸｜|]/_/g;              # strip slashes/pipes       s/[–—]/-/g;                # normalise dashes       s/  +/ /g;                 # squeeze spaces       s/^ +//; s/ +$//;          # trim       s/ - /-/g;                 # tighten hyphen       s/ /_/g;              ...

  Why xdg-open is Irritating by Default (and How to Fix It) If you’ve ever tried to open a batch of files on Linux using xdg-open , you’ve probably discovered a big irritation: it doesn’t accept shell globs properly . On macOS, the open command feels natural. You can run: open *.jpg …and every JPEG in your folder pops open in your default viewer. Simple, predictable, done. On Linux, however, xdg-open — the command that sits behind the /usr/bin/open symlink on many systems — behaves differently. While it will happily open a single file, it stumbles when you throw a wildcard at it. Rather than expanding the glob and opening each file, it usually just tries (and fails) on the first one, or misinterprets the argument altogether. That makes it useless in the very situations you’d expect it to shine: folders full of images, PDFs, or text files you want to view in bulk. The Fix: Replace open with a Smarter Wrapper Fortunately, the shell itself can handle globbing. The trick...