howto-index.sh: use the $( ... ) construct for command substitution

The Git CodingGuidelines prefer the $(...) construct for command
substitution instead of using the backquotes `...`.

The backquoted form is the traditional 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.

The patch was generated by:

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

and then carefully proof-read.

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
Reviewed-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/howto-index.sh b/Documentation/howto-index.sh
index a2340864b534b4eaa7c8f9a6197563b8d939c544..167b363668b8b53d752d5971798d3ca26c8f7f1f 100755 (executable)
--- a/Documentation/howto-index.sh
+++ b/Documentation/howto-index.sh
@@ -11,8 +11,8 @@ EOF
 
 for txt
 do
-       title=`expr "$txt" : '.*/\(.*\)\.txt$'`
-       from=`sed -ne '
+       title=$(expr "$txt" : '.*/\(.*\)\.txt$')
+       from=$(sed -ne '
        /^$/q
        /^From:[        ]/{
                s///
@@ -21,9 +21,9 @@ do
                s/^/by /
                p
        }
-       ' "$txt"`
+       ' "$txt")
 
-       abstract=`sed -ne '
+       abstract=$(sed -ne '
        /^Abstract:[    ]/{
                s/^[^   ]*//
                x
@@ -39,11 +39,11 @@ do
                x
                p
                q
-       }' "$txt"`
+       }' "$txt")
 
        if grep 'Content-type: text/asciidoc' >/dev/null $txt
        then
-               file=`expr "$txt" : '\(.*\)\.txt$'`.html
+               file=$(expr "$txt" : '\(.*\)\.txt$').html
        else
                file="$txt"
        fi