CygwinPaltform Identification

Wed Feb 9 09:12:12 GMT 2022

Brian Inglis writes:
> On 2022年02月08日 15:01, julie77793@gmail.com wrote:
>> Cygwin doesn't create an environment variable in bash to indicate that the
>> platform is Cygwin under Windows.
>> ...
>> I have been switching env/OS/arch/triple dependent profile and rc files
> and sections for years with:
>> 64 $ echo $OSTYPE $OS $HOSTTYPE $MACHTYPE
> cygwin Windows_NT x86_64 x86_64-unknown-cygwin
> ...

When I don't know or can't remember what variable has the information
I want, printenv is my first stop, e.g.
 64> printenv | grep -i cygwin
 Cygwin=server
 PATH=...
As Brian pointed out, that doesn't find what you need, because it only
lists environment variables, but this does:
 64> declare -p | grep -i cygwin
 declare -ar BASH_VERSINFO=([0]="4" [1]="4" [2]="12" [3]="3" [4]="release" [5]="x86_64-unknown-cygwin")
 declare -x Cygwin="server"
 declare -- MACHTYPE="x86_64-unknown-cygwin"
 declare -- OSTYPE="cygwin"
 declare -x PATH=...
ht
-- 
 Henry S. Thompson, School of Informatics, University of Edinburgh
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