Sort by version idiosyncrasy

[birdie]

It looks like sort by version doesn't always work correctly. Consider this listing:

libpango-1.0.so
libpango-1.0.so.0
libpango-1.0.so.0.4800.4
libpangocairo-1.0.so
libpangocairo-1.0.so.0
libpangocairo-1.0.so.0.4800.4
libpangoft2-1.0.so
libpangoft2-1.0.so.0
libpangoft2-1.0.so.0.4800.4
libpangomm-1.4.so.1
libpangomm-1.4.so.1.0.30
libpangoxft-1.0.so
libpangoxft-1.0.so.0
libpangoxft-1.0.so.0.4800.4

This is exactly what you see when you sort by name.

However when you change the sorting mode to "by version" then something weird happens:

libpangocairo-1.0.so
libpangocairo-1.0.so.0
libpangocairo-1.0.so.0.4800.4
libpangoft2-1.0.so
libpangoft2-1.0.so.0
libpangoft2-1.0.so.0.4800.4
libpangomm-1.4.so.1
libpangomm-1.4.so.1.0.30
libpangoxft-1.0.so
libpangoxft-1.0.so.0
libpangoxft-1.0.so.0.4800.4
libpango-1.0.so
libpango-1.0.so.0
libpango-1.0.so.0.4800.4

This doesn't look right and seems rather illogical. Why has "libpango-1.0.so" become the last one on the list?

[andrew_b]

$ ls -1
libpango-1.0.so
libpango-1.0.so.0
libpango-1.0.so.0.4800.4
libpangocairo-1.0.so
libpangocairo-1.0.so.0
libpangocairo-1.0.so.0.4800.4
libpangoft2-1.0.so
libpangoft2-1.0.so.0
libpangoft2-1.0.so.0.4800.4
libpangomm-1.4.so.1
libpangomm-1.4.so.1.0.30
libpangoxft-1.0.so
libpangoxft-1.0.so.0
libpangoxft-1.0.so.0.4800.4

$ ls -1 | sort --version-sort
libpangocairo-1.0.so
libpangocairo-1.0.so.0
libpangocairo-1.0.so.0.4800.4
libpangoft2-1.0.so
libpangoft2-1.0.so.0
libpangoft2-1.0.so.0.4800.4
libpangomm-1.4.so.1
libpangomm-1.4.so.1.0.30
libpangoxft-1.0.so
libpangoxft-1.0.so.0
libpangoxft-1.0.so.0.4800.4
libpango-1.0.so
libpango-1.0.so.0
libpango-1.0.so.0.4800.4

[andrew_b]

Or just

$ ls -1 -v
libpangocairo-1.0.so
libpangocairo-1.0.so.0
libpangocairo-1.0.so.0.4800.4
libpangoft2-1.0.so
libpangoft2-1.0.so.0
libpangoft2-1.0.so.0.4800.4
libpangomm-1.4.so.1
libpangomm-1.4.so.1.0.30
libpangoxft-1.0.so
libpangoxft-1.0.so.0
libpangoxft-1.0.so.0.4800.4
libpango-1.0.so
libpango-1.0.so.0
libpango-1.0.so.0.4800.4

[birdie]

So, the problem affects ls as well.

[andrew_b]

​https://lists.gnu.org/archive/html/coreutils/2021-04/msg00017.html

[andrew_b]

If you convince the authors of coreutils to change the current behavior, feel free to reopen this ticket.