tcsh filename pattern matching fails

[Harry G McGavran Jr]

TCSH filename pattern matching bug --

To reproduce:

1) Make a subdirectory

2) cd to that subdirectory

3) create or touch the files x1 x2 x3 x4 x5 x6 x7 x8 and x9

4) execute the command:
      "echo x[7-9]"

You will see all the files echo, NOT just x7 x8 and x9...

/bin/sh and /bin/bash still do this correctly... but tcsh seems broken!

Description: Ubuntu 20.04.1 LTS
Release: 20.04

tcsh:
  Installed: 6.21.00-1
  Candidate: 6.21.00-1
  Version table:
 *** 6.21.00-1 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

[Alain (alainth)]

Pattern matching is broken in numerous ways in this version.
For example:
echo .[a-z]
will match .. in a directory, which it should definitely not!
Any other shell available does this properly.

[Michal Szymanski (msz-astrouw)]

Ubuntu Maintainers, please fix that nasty bug ASAP. It is a serious bug, easily leading to, e.g. accidental, unwanted deleting of files.
For an unknown reason, Ubuntu keeps distributing this buggy tcsh 6.21 version although it was fixed already in 6.22 released in November 2019. There is now version 6.24.1 and Ubuntu 22.04 still ships with 6.21.