look command prints only words with capital first letter

[Daniel Barrett]

The command /usr/bin/look prints only words that begin with an upper-case letter, even if the search string begins with a lower-case letter.

$ look big
BigQuery
BigQuery's
Bigfoot
Bigfoot's
Biggles
Biggles's

This is incorrect behavior. "look" should also print words like big, bigger, biggest.

$ grep '^big' /usr/share/dict/wordsbig
bigamist
bigamist's
bigamists
bigamous
...

Adding the -f option does not change the behavior.

Bug reproduced on two different Ubuntu 22.04 systems.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: bsdextrautils 2.37.2-4ubuntu3
ProcVersionSignature: Ubuntu 5.15.0-87.97-generic 5.15.122
Uname: Linux 5.15.0-87-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Oct 25 20:36:39 2023
InstallationDate: Installed on 2020-02-29 (1334 days ago)
InstallationMedia: Kubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: util-linux
UpgradeStatus: Upgraded to jammy on 2022-12-03 (326 days ago)