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Date:	Tue, 17 Jun 2014 13:16:39 -0600
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Subject:	Re: Change PS1 when running as administrator
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On 06/17/2014 10:21 AM, Ernie Rael wrote:
> On 6/17/2014 1:45 AM, GrahamC wrote:
>> If we are looking for other alternatives the GROUPS environment
>> variable can also be used:
>>
>> PS1=3D'\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ '
>> for G in "${GROUPS[@]}"; do
>>      if [ "$G" =3D 544 ]; then
>>          PS1=3D'\[\e]0;Administrator \w\a\]\n\[\e[32m\]\u@\h
>> \[\e[33m\]\w\[\e[0m\]\n# '
>>      fi
>> done
>=20
> Speaking of alternatives,
>=20
> For matching in bash, something like
>=20
>     [[ $(id -G) =3D~ \b544\b ]]

\b is a glibc regex() extension, not supported in Cygwin regex

Cygwin supports \< as a shortcut for [[:<:]], and \> as a shortcut for
[[:>:]], which are both BSD extensions.  \b is roughly equivalent to
[[:<:][:>:]] - but someone would have to actually patch cygwin's
regcomp.c to enable that extension.

https://cygwin.com/viewvc/src/winsup/cygwin/regex/regcomp.c?view=3Dco&revis=
ion=3D1.16&content-type=3Dtext%2Fplain

>=20
> was suggested (the suggestion used symbolic name instead of a number and
> didn't use word boundary). Seems like word boundary is needed, but I
> couldn't get this to work. Are the regex boundary matchers not
> supported  by bash =3D~ operator?

bash only supports what the libc regex() supports, and since Cygwin
regex() is not as full-featured as glibc regex(), the answer is that you
can't use \b in Cygwin bash (yet; PTC).

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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