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Re: How to know < is specified for a script?

From: Eli Schwartz
Subject: Re: How to know < is specified for a script?
Date: Sun, 8 Mar 2020 16:25:35 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/8/20 2:12 PM, Peng Yu wrote:
> Hi,
> Given the following two ways to call, is there a way in
> to tell how it is called? Thanks.
> ./
> ./ < something

In both cases it is called as ./, the only difference that is
caused by "< inputfile" is that the script is called with standard input
being redirected from a file rather than being a tty.

You could check [[ -t 0 ]] to see whether it is the first case.

Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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