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Re: History event execution in command substition
From: |
Chet Ramey |
Subject: |
Re: History event execution in command substition |
Date: |
Sat, 10 Jan 2015 12:24:25 -0500 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
On 1/9/15 5:58 PM, Zigmund.Ozean@zig-home.localdomain wrote:
> Bash Version: 4.3
> Patch Level: 30
> Release Status: release
>
> Description:
> Inside command substition, an exclamation character will always try
> execute a command from history. Quoting has an unexpected result.
History expansion is part of readline, and knows next to nothing about
shell syntax. It knows a little bit about the shell-like quoting that is
common to many Unix applications, but not much else. There is a minimal
hook function that allows applications to suppress expansions the history
library would ordinarily perform, so maybe it can be extended to understand
these constructs.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/