[edk2-devel] Logical operator function in shell environment

[Tiger Liu(BJ-RD)]

Hi, Ray:
Thanks for your reply!

I looked it up in shell spec, not find logical operator functions supported.

I found shell supported redirect output to an environment variable.
But I could not succeed in my experiment.
For example:
1. I create a environment variable "testvar" with set command
2. Then, I execute "date > testvar", but failed.


Thanks
-----邮件原件-----
发件人: Ni, Ray <ray.ni at intel.com>
发送时间: 2022年9月20日 16:56
收件人: devel at edk2.groups.io; Tiger Liu(BJ-RD) <TigerLiu at zhaoxin.com>
主题: RE: [edk2-devel] Logical operator function in shell environment

I don't know whether Shell supports such capability. Can you check the Shell spec?
It's also possible that Spec supports such capability but implementation doesn't.
Then you are welcome to implement that in ShellPkg.

> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Tiger
> Liu(BJ-RD)
> Sent: Tuesday, September 20, 2022 1:37 PM
> To: devel at edk2.groups.io
> Subject: [edk2-devel] Logical operator function in shell environment
>
> Hi, Experts:
> I am writing a shell script.
>
> I have a few questions about shell script syntax.
> For examples:
> 1. Could I save register content (which is read with mm command) to a
> local variable?
>   Take an example:
>   Reading register 0x80's content with mm command, and I want to save
> its content to a local variable for further processing.
>
>    Maybe, I could use command output redirection syntax, and redirect
> its content to an environment variable?
> 2. Is there any logical operator functions could be used in shell script?
> Such as : and / or functions.
>
> Thanks
>
>
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