[PATCH 092/144] t7408-submodule-reference.sh: use the $( ... ) construct for command substitution

The Git CodingGuidelines prefer the $( ... ) construct for command
substitution instead of using the back-quotes, or grave accents (`..`).

The backquoted form is the historical method for command substitution,
and is supported by POSIX. However,all but the simplest uses become
complicated quickly. In particular,embedded command substitutions
and/or the use of double quotes require careful escaping with the backslash
character. Because of this the POSIX shell adopted the $(…) feature from
the Korn shell.

Signed-off-by: Elia Pinto <redacted>
---
 t/t7408-submodule-reference.sh |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t7408-submodule-reference.sh b/t/t7408-submodule-reference.sh
index b770b2f..eaea19b 100755
--- a/t/t7408-submodule-reference.sh
+++ b/t/t7408-submodule-reference.sh

@@ -6,7 +6,7 @@
 test_description='test clone --reference'
 . ./test-lib.sh
 
-base_dir=`pwd`
+base_dir=$(pwd)
 
 U=$base_dir/UPLOAD_LOG
 

-- 
1.7.10.4