Сортировка по имени файла с помощью команды du

Я думаю по поводу:

От человека:

по поводу - поиск по именам и описаниям справочных страниц

Пример:

$ apropos pdf
dvipdf (1)           - Convert TeX DVI file to PDF using ghostscript and dvips
evince-thumbnailer (1) - create png thumbnails from PostScript and PDF documents
fix-qdf (1)          - repair PDF files in QDF form after editing
ghostscript (1)      - Ghostscript (PostScript and PDF language interpreter and previewer)
gs (1)               - Ghostscript (PostScript and PDF language interpreter and previewer)
gsnd (1)             - Run ghostscript (PostScript and PDF engine) without display
pdf2dsc (1)          - generate a PostScript page list of a PDF document
pdf2ps (1)           - Ghostscript PDF to PostScript translator
pdfdetach (1)        - Portable Document Format (PDF) document embedded file extractor (version 3.03)
pdffonts (1)         - Portable Document Format (PDF) font analyzer (version 3.03)
pdfimages (1)        - Portable Document Format (PDF) image extractor (version 3.03)
pdfinfo (1)          - Portable Document Format (PDF) document information extractor (version 3.03)
pdfseparate (1)      - Portable Document Format (PDF) page extractor
pdftocairo (1)       - Portable Document Format (PDF) to PNG/JPEG/TIFF/PDF/PS/EPS/SVG using cairo
pdftohtml (1)        - program to convert PDF files into HTML, XML and PNG images
pdftoppm (1)         - Portable Document Format (PDF) to Portable Pixmap (PPM) converter (version 3.03)
pdftops (1)          - Portable Document Format (PDF) to PostScript converter (version 3.03)
pdftotext (1)        - Portable Document Format (PDF) to text converter (version 3.03)
pdfunite (1)         - Portable Document Format (PDF) page merger
ps2ascii (1)         - Ghostscript translator from PostScript or PDF to ASCII
ps2pdf (1)           - Convert PostScript to PDF using ghostscript
ps2pdf12 (1)         - Convert PostScript to PDF 1.2 (Acrobat 3-and-later compatible) using ghostscript
ps2pdf13 (1)         - Convert PostScript to PDF 1.3 (Acrobat 4-and-later compatible) using ghostscript
ps2pdf14 (1)         - Convert PostScript to PDF 1.4 (Acrobat 5-and-later compatible) using ghostscript
ps2pdfwr (1)         - Convert PostScript to PDF without specifying CompatibilityLevel, using ghostscript
qpdf (1)             - PDF transformation software
snmpdf (1)           - display disk space usage on a network entity via SNMP