On 15 September 2015 at 18:15, Vincent Belaïche
<vincent.belai...@gmail.com> wrote:
> No, these lines are bogous because
>
> $EGREP -iv 'cygwin|mingw|djgpp'
>
> will always fail. As a result path_sep is always set to `:'.
>
> ORing is done with \| no | for egrep, | is used by grep. See info nodes
> `(grep) Fundamental Structure' for grep, and `(grep) Basic vs Extended'.
I believe you have it completely back-to-front:
3.6 Basic vs Extended Regular Expressions
=========================================
In basic regular expressions the meta-characters `?', `+', `{', `|',
`(', and `)' lose their special meaning; instead use the backslashed
versions `\?', `\+', `\{', `\|', `\(', and `\)'.
egrep uses the extended versions, grep the basic version.
