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 <gitter.spi...@gmail.com>
---
 t/t6002-rev-list-bisect.sh |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/t6002-rev-list-bisect.sh b/t/t6002-rev-list-bisect.sh
index 43ad772..3bf2759 100755
--- a/t/t6002-rev-list-bisect.sh
+++ b/t/t6002-rev-list-bisect.sh
@@ -27,9 +27,9 @@ test_bisection_diff()
        # Test if bisection size is close to half of list size within
        # tolerance.
        #
-       _bisect_err=`expr $_list_size - $_bisection_size \* 2`
-       test "$_bisect_err" -lt 0 && _bisect_err=`expr 0 - $_bisect_err`
-       _bisect_err=`expr $_bisect_err / 2` ; # floor
+       _bisect_err=$(expr $_list_size - $_bisection_size \* 2)
+       test "$_bisect_err" -lt 0 && _bisect_err=$(expr 0 - $_bisect_err)
+       _bisect_err=$(expr $_bisect_err / 2) ; # floor
 
        test_expect_success \
        "bisection diff $_bisect_option $_head $* <= $_max_diff" \
-- 
1.7.10.4

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