in reply to Re: Zipping the contents of a directory by filename
in thread Zipping the contents of a directory by filename

This depends greatly on the content of the pdf. I just gzipped a few random pdfs and got between 4.2% and 51.6% reduction.

> ls -lh ?.pdf
-rwxrwx--- 1 root vboxsf 4.0M Jun  2 15:01 1.pdf*
-rwxrwx--- 1 root vboxsf 1.9M Jun  2 15:01 2.pdf*
-rwxrwx--- 1 root vboxsf 1.2M Jun  2 15:01 3.pdf*
-rwxrwx--- 1 root vboxsf 340K Jun  2 15:01 4.pdf*
-rwxrwx--- 1 root vboxsf  69K Jun  2 15:01 5.pdf*
-rwxrwx--- 1 root vboxsf 416K Jun  2 15:01 6.pdf*
> gzip -v ?.pdf
1.pdf:   19.5% -- replaced with 1.pdf.gz
2.pdf:   23.2% -- replaced with 2.pdf.gz
3.pdf:   51.6% -- replaced with 3.pdf.gz
4.pdf:    4.2% -- replaced with 4.pdf.gz
5.pdf:    8.3% -- replaced with 5.pdf.gz
6.pdf:    6.2% -- replaced with 6.pdf.gz
> ls -lh ?.pdf.gz
-rwxrwx--- 1 root vboxsf 3.3M Jun  2 15:01 1.pdf.gz*
-rwxrwx--- 1 root vboxsf 1.4M Jun  2 15:01 2.pdf.gz*
-rwxrwx--- 1 root vboxsf 557K Jun  2 15:01 3.pdf.gz*
-rwxrwx--- 1 root vboxsf 326K Jun  2 15:01 4.pdf.gz*
-rwxrwx--- 1 root vboxsf  63K Jun  2 15:01 5.pdf.gz*
-rwxrwx--- 1 root vboxsf 390K Jun  2 15:01 6.pdf.gz*

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Re^3: Zipping the contents of a directory by filename
by karlgoethebier (Abbot) on Jun 02, 2025 at 15:29 UTC

    Interesting. Here is a benchmark, to complete the picture:

    
hyperfine --runs 10000 'gzip -k -c a.pdf -c b.pdf c.pdf > out.gz' 'tar
+ cf out.tar a.pdf b.pdf c.pdf'
# truncated output
 
Summary
  'tar cf out.tar a.pdf b.pdf c.pdf' ran
    1.72 ± 0.57 times faster than 'gzip -k -c a.pdf -c b.pdf c.pdf > o
+ut.gz'

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    Possibly too few files but tar is significantly faster.

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