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.

The patch was generated by the simple script

for _f in $(find . -name "*.sh")
do
  sed -i 's@`\(.*\)`@$(\1)@g' ${_f}
done

Signed-off-by: Elia Pinto <gitter.spi...@gmail.com>
---
 t/t4013-diff-various.sh |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index e77c09c..805b055 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -107,14 +107,14 @@ test_expect_success setup '
 +*++ [initial] Initial
 EOF
 
-V=`git version | sed -e 's/^git version //' -e 's/\./\\./g'`
+V=$(git version | sed -e 's/^git version //' -e 's/\./\\./g')
 while read cmd
 do
        case "$cmd" in
        '' | '#'*) continue ;;
        esac
-       test=`echo "$cmd" | sed -e 's|[/ ][/ ]*|_|g'`
-       pfx=`printf "%04d" $test_count`
+       test=$(echo "$cmd" | sed -e 's|[/ ][/ ]*|_|g')
+       pfx=$(printf "%04d" $test_count)
        expect="$TEST_DIRECTORY/t4013/diff.$test"
        actual="$pfx-diff.$test"
 
-- 
1.7.10.4

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