<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">On 14-04-07 07:42 AM, James Cloos wrote: </div> <blockquote cite="mid:m361mlnz51.fsf@carbon.jhcloos.org" type="cite"> <pre wrap="">But re commit 44915d6953076, HG> tty_num=$(echo "$tty" | grep -oE '[0-9]+$') Is grep -o available everwhere startx(1) runs? The posix page, grep.1p, does not mention -o. It looks like each of the BSDs have adopted it, but only midstream (eg, its documented in OpenBSD 5.0, but not in 4.9). </pre> </blockquote> I looked in the autoconf manual: <blockquote><a class="moz-txt-link-freetext" href="http://www.gnu.org/software/autoconf/manual/autoconf.html#grep">http://www.gnu.org/software/autoconf/manual/autoconf.html#grep</a> </blockquote> <blockquote><tt>"Portable scripts can rely on the </tt><samp>grep</samp><tt> options </tt><samp>-c</samp><tt>, </tt><samp>-l</samp><tt>, </tt><samp>-n</samp><tt>, and </tt><samp>-v</samp><tt>, but should avoid other options</tt>" </blockquote> </body> </html>