nb/cli_commands.md

CLI Cheatsheet

Contents

• Drupal / Drush
• Text Processing
• Torrents
• PDF Tools

---

Drupal / Drush

Note: These SQL queries target the Drupal 7 schema (node_type table). They won't work as-is on Drupal 8+.

List content types with node counts

drush sqlq 'select count(node.nid) as node_count, node_type.type
            from node
            inner join node_type on node.type = node_type.type
            group by node_type.type'

Filter results by keyword (e.g. "2014")

drush sqlq 'select count(node.nid) as node_count, node_type.type
            from node
            inner join node_type on node.type = node_type.type
            group by node_type.type' | grep 2014

---

Text Processing

Find and replace inside files (perl)

# Single file type in current directory
perl -pi -w -e 's/SEARCH_FOR/REPLACE_WITH/g;' *.txt

# Recursively across all file types
perl -pi -w -e 's/thex/robertsonlibrary/g;' **/*.*

Find and replace in file names

# Rename files matching a pattern, verbose output shows what changed
rename 's/livero/lives/g' **/*.* -v

---

Torrents

Download via magnet link (aria2c)

# aria2c is a lightweight multi-protocol download utility
aria2c -d ~/Downloads "magnetlink"

---

PDF Tools

OCR a PDF (ocrmypdf)

# Standard: optimize output, skip pages that already have a text layer
ocrmypdf --optimize 3 --skip-text input.pdf output.pdf

# Aggressive: force re-OCR even if a text layer exists (useful for corrupt/bad layers),
# set DPI manually, use page segmentation mode 1 (automatic with OSD)
ocrmypdf --optimize 3 --image-dpi 300 --output-type pdf \
         --force-ocr --tesseract-pagesegmode 1 input.pdf output.pdf

Downsample a PDF to 72dpi (Ghostscript)

# Single file
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 \
   -dPDFSETTINGS=/screen \
   -dNOPAUSE -dQUIET -dBATCH \
   -sOutputFile=output.pdf input.pdf

# Batch - processes all PDFs in current folder, preserves original filenames
mkdir -p downsampled
for f in *.pdf *.PDF; do
    [ -f "$f" ] || continue
    gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen \
       -dNOPAUSE -dBATCH -dQUIET \
       -sOutputFile="downsampled/$f" \
       "$f"
done

Check image DPI in PDFs (pdfimages)

# Print image info to terminal
for f in *.pdf *.PDF; do
    echo "=== $f ==="
    pdfimages -list "$f"
    echo ""
done

# Save output to images_list.txt instead
for f in *.pdf *.PDF; do
    [ -f "$f" ] || continue
    echo "=== $f ===" >> images_list.txt
    pdfimages -list "$f" >> images_list.txt
    echo "" >> images_list.txt
done

Scan for CCITT encoding

# CCITT is a fax-era compression format - flags PDFs that may cause compatibility issues
for f in *.pdf *.PDF; do
    [ -f "$f" ] || continue
    if pdfimages -list "$f" 2>/dev/null | grep -q " ccitt "; then
        echo "$f uses CCITT"
    fi
done