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Re: [Help-bash] Best way to suppress the error message in $(< nonexisten
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From: |
Greg Wooledge |
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Subject: |
Re: [Help-bash] Best way to suppress the error message in $(< nonexistent_file) |
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Date: |
Wed, 28 Nov 2018 09:11:53 -0500 |
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User-agent: |
NeoMutt/20170113 (1.7.2) |
On Wed, Nov 28, 2018 at 07:59:10AM -0600, Peng Yu wrote:
> > { x=$( <doesnotexist) ;} 2>&-
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> OK. Thanks. BTW, I think that 2>&- the same as 2>/dev/null
> semantically the same. Is it so?
No. One of them redirects stderr to /dev/null and the other closes
stderr completely.
In the general case, commands that expect to be able to write error
messages to stderr will blow up if you use 2>&-. It may work HERE
since there is no external command being invoked. It's still a really
bad practice, and you SHOULD NOT get into the habit of doing it.
https://mywiki.wooledge.org/BashPitfalls#pf55