fix(gnokii): avoid non-POSIX BRE \|

\| is not supported by POSIX Basic Regular Expressions (BRE).  Another
way is to use newline to separate the two matches in `grep` pattern,
but this is not a commonly-used approach.  We instead use `sed` to
remove the two matches separately.

Author: akinomyoga

completions/gnokii

@@ -222,9 +222,9 @@ _comp_cmd_gnokii()
     fi
 
     local all_cmd="$(_parse_help "$1" "--help all")"
-    # these 2 below are allowed in combination with others
-    local main_cmd=$(command grep -v -- '--config\|--phone' <<<"$all_cmd")
 
+    # these 2 below are allowed in combination with others
+    local main_cmd=$(command sed -e '/--config/d;/--phone/d' <<<"$all_cmd")
     # don't provide main command completions if one is
     # already on the command line
     [[ $COMP_LINE =~ $(tr ' ' '\b|' <<<"$main_cmd") ]] && return