Public bug reported:
According to the man page, $(variable:offset[:length]} should treat
negative offsets as counting from the end of the value. Instead, I find
any such substring expansion expands the ENTIRE variable regardless of
the exact negative offset or any length provided.
A short typescript is attached. It shows two good expansions followed
by three bad ones.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bash 5.0-6ubuntu1.1
ProcVersionSignature: Ubuntu 5.4.0-66.74-generic 5.4.86
Uname: Linux 5.4.0-66-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Tue Mar 23 09:09:28 2021
SourcePackage: bash
UpgradeStatus: Upgraded to focal on 2021-02-19 (32 days ago)
** Affects: bash (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "showing what happens when I try it"
https://bugs.launchpad.net/bugs/1920967/+attachment/5480253/+files/typescript
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https://bugs.launchpad.net/bugs/1920967
Title:
Bash not interpreting negative offsets in Substrring Expanison of
parameters
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