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[Bug Report] The Unexpected Behavior When Using ANSI Escape Code

From: Michaelll Lee
Subject: [Bug Report] The Unexpected Behavior When Using ANSI Escape Code
Date: Sun, 20 Mar 2022 17:20:54 +0800

*Below are generated automatically by **'/usr/bin/bashbug' due to the
absence of 'rmail**’** command.*


*From:* Michael(lwl20th@gmail.com)
*To:* bug-bash@gnu.org
*Subject: *The Unexpected Behavior When Using ANSI Escape Code.

*Configuration Information [Automatically generated, do not change]:*
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -march=x86-64 -mtune=generic -O2 -pipe -fno-plt
-DSTANDARD_UTILS_PATH='/usr/bin' -DSYS_BASHRC='/etc/bash.bashrc'
uname output: Linux arch80g 5.16.13-arch1-1 #1 SMP PREEMPT Tue, 08 Mar 2022
20:07:36 +0000 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.1
Patch Level: 16
Release Status: release


Background: A normal Bash user for a while.

When ``PS1’’ environment variable contains the ANSI escape codes, Bash will
behavior unexpectedly when Copy&Paste the content from clipboard using
Ctrl+V. This unexpected behaviour could be easily reproduced in a few steps.

Reproduceable steps are:

1) $ PS1='---Test \\ \e[0m ---\\$ '
         [Press <ENTER> Key]
2) [Paste '123456789_123456789_' with <Ctrl+V>]

3) [Press <Right Arrow> Key]

4) [Everything Is Fine]

5) [Paste '123456789_123456789_123456789_' with <Ctrl+V>]

6) [Press <Right Arrow> Key]

7) ---Test \  ---$ 1234123456789_123456789_123456789
         [Result in Extra Charavters: The Leading '1234']

8) [Paste '123456789_123456789_']

9) [Press <Right Arrow> Key]

10) [Everything Is Fine]

According to my limited tests, this behavior (i.e., Step7) could exist on
serveral platforms on which the BASH_VERSION is 5.x.x. However, this
behavior cannot be found on the same platforms while 4.x.x/3.x.x version of
Bash is invoked.

When the steps mentioned above being applied to other counterparts which
currently being as active development as Bash, Step7 would not happen for

Hence, it is a reasonable guess that this might be bug for 5.x.x version of
Bash. If not, that would be my misuse of Bash, and would appreciate for
taking time reading my report.

No currently.

Would be glad to provide a fix if I'm capable of.


Michael Lee

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