mainThe GNU Bourne-Again SHell - Support: sr #109672, conditional expression and...


sr #109672: conditional expression and associative array expansion bug

Submitter:  None
Submitted:  Wed 17 Apr 2019 05:02:55 PM UTC
Category:  None Priority:  5 - Normal
Severity:  4 - Important Status:  Invalid
Privacy:  Public Assigned to:  None
Originator Email:  -email is unavailable- Open/Closed:  Open
Operating System:  GNU/Linux
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Fri 19 Apr 2019 02:42:05 PM UTC, comment #1: 

This isn't a bug. The array subscript gets expanded so side effects take place. Since the variable isn't set, the default is an indexed array, and the subscript is expanded as an arithmetic expression. IP is a token that looks like a variable, so it gets expanded and replaced with its value. /sbin/ip is not a valid token or operator, so you get an arithmetic syntax error.

It doesn't require that __client be unset; declaring __client as an indexed array would produce the same error.

Chet Ramey <chet>
Group administrator
Wed 17 Apr 2019 05:02:55 PM UTC, original submission:  

The following code:

#!/bin/bash -x


if [[ ${__client[IP]} ]]; then
        echo "Boink!"

Generates the following output:

+ IP=/sbin/ip
./ line 5: /sbin/ip: syntax error: operand expected (error token is "/sbin/ip")

It only happens if the "__client" is unset.



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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-04-19 chet StatusNone Invalid

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