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/t5304-prune.sh |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t5304-prune.sh b/t/t5304-prune.sh
index 66c9a41..84501a5 100755
--- a/t/t5304-prune.sh
+++ b/t/t5304-prune.sh
@@ -222,7 +222,7 @@ EOF
 '
 
 test_expect_success 'prune .git/shallow' '
-       SHA1=`echo hi|git commit-tree HEAD^{tree}` &&
+       SHA1=$(echo hi|git commit-tree HEAD^{tree}) &&
        echo $SHA1 >.git/shallow &&
        git prune --dry-run >out &&
        grep $SHA1 .git/shallow &&
-- 
1.7.10.4

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