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Subject:	Re: Bash heredoc on FD 3
To:	cygwin AT cygwin DOT com
References:	<5c0427c5 DOT 1c69fb81 DOT d71e5 DOT c8ec AT mx DOT google DOT com> <b153a5b5-deea-c039-e93a-0555d8e2dba8 AT gmail DOT com>
From:	cyg Simple <cygsimple AT gmail DOT com>
Message-ID:	<c4a78860-bae5-7b00-a262-f9beb0148455@gmail.com>
Date:	Mon, 3 Dec 2018 10:55:57 -0500
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On 12/3/2018 10:43 AM, cyg Simple wrote:
> 
> On 12/2/2018 1:43 PM, Steven Penny wrote:
>> Using this file:
>>
>>     $ cat hello.sh
>>     awk -f /dev/fd/3 3<<eof
>>     BEGIN {
>>       print "hello world"
>>     }
>>     eof
>>
>> it runs as expected with Dash:
>>
>>     $ dash hello.sh
>>     hello world
>>
>> However it fails with Bash:
>>
>>     $ bash hello.sh
>>     awk: fatal: can't open source file `/dev/fd/3' for reading (No 
>> such file or
>>     directory)
>>
>> I tried also with Debian and both Dash and Bash work as expected. What is
>> causing Cygwin Bash to fail here?
> 
> Same for me and interestingly:
> 
> $ ls -ld /dev/fd/*
> ls: cannot access '/dev/fd/3': No such file or directory
> ls: cannot access '/dev/fd/31': No such file or directory
> lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:39 /dev/fd/0 -> /dev/pty2
> lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:39 /dev/fd/1 -> /dev/pty2
> lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:39 /dev/fd/2 -> /dev/pty2

And:

$ dash -c '/bin/ls -l /dev/fd/'
total 0
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 0 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 1 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 2 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 3 -> /proc/27356/fd

$ dash -c '/bin/ls -l /dev/fd/'
total 0
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 0 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 1 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 2 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:51 3 -> /proc/18740/fd


So in Bash the process is no longer available.  Adding -d to the above:

$ dash -c '/bin/ls -ld /dev/fd/*'
/bin/ls: cannot access '/dev/fd/3': No such file or directory
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:50 /dev/fd/0 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:50 /dev/fd/1 -> /dev/pty2
lrwxrwxrwx 1 eboyd53 eboyd53 0 Dec  3 10:50 /dev/fd/2 -> /dev/pty2


-- 
cyg Simple

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