Do not depend on readlink(1) or -q

Solaris 10 lacks readlink(1). Additionally, its different grep(1) and
diff(1) do not take a `-q` flag.

Use a Perl one-liner instead of readlink(1) which is missing on Solaris 10.
Also because /usr/bin/grep and diff(1) don't understand the `-q` option, make
them go quiet by redirecting stdout to `/dev/null` instead.

The Perl dependency only exists in the test suite, so it does not incur
a runtime penalty for end users.

This is to work around the fact that readlink(1) is missing on Solaris.
The tradeoff is: on Solaris, installing third-party software (readlink)
is a pain, whereas on e.g. FreeBSD installing third-party software
(Perl) is simple and common.

1 files changed, 1 insertions, 1 deletions

diff --git a/share/rcm.sh.in b/share/rcm.sh.in
index 2ce68d4..d8fc19e 100644
--- a/share/rcm.sh.in
+++ b/share/rcm.sh.in
@@ -51,7 +51,7 @@ echo_stderr() {
 }
 
 is_relative() {
-  echo "$1" | grep -vq '^/'
+  echo "$1" | grep -v '^/' >/dev/null
 }
 
 version() {