t7810: avoid unportable use of "echo"

diff --git a/t/README b/t/README
index 6122a6c73352e6986bc8f97fc803105dcd671c25..238729c5b7168919ab6f79cf0a0b11c4833ddeae 100644 (file)
--- a/t/README
+++ b/t/README
@@ -79,6 +79,10 @@ appropriately before running "make".
 --debug::
        This may help the person who is developing a new test.
        It causes the command defined with test_debug to run.
+       The "trash" directory (used to store all temporary data
+       during testing) is not deleted even if there are no
+       failed tests so that you can inspect its contents after
+       the test finished.
 
 --immediate::
        This causes the test to immediately exit upon the first
@@ -583,6 +587,11 @@ use these, and "test_set_prereq" for how to define your own.
    Test is not run by root user, and an attempt to write to an
    unwritable file is expected to fail correctly.
 
+ - LIBPCRE
+
+   Git was compiled with USE_LIBPCRE=YesPlease. Wrap any tests
+   that use git-grep --perl-regexp or git-grep -P in these.
+
 Tips for Writing Tests
 ----------------------