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Re: Environment variable "PS4" can not be passed to bash script from ver
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From: |
Chet Ramey |
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Subject: |
Re: Environment variable "PS4" can not be passed to bash script from version 4.2.46(2) |
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Date: |
Tue, 23 Oct 2018 16:47:48 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
On 10/23/18 12:06 PM, Greg Wooledge wrote:
> On Tue, Oct 23, 2018 at 03:20:12PM +0000, Chen, Farrah wrote:
>> But in Bash script, it cannot work, it keeps its original value:
>> [root@fchen ~]# cat test.sh
>> #!/usr/bin/bash
>> echo $PS4
>> echo $FAN
>
> This is because you're doing it as root. Bash strips PS4 from the
> environment when started as root, as a security precaution.
That change came in in bash-4.3 (patch 48). His vendor probably patched
their version of bash-4.2 to do the same thing.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/