From: Paul Campbell <pcampb...@kemitix.net>

Use of -a and -o in the [ command can have confusing semantics.

Use a separate test invocation for each single test, combining them with
&& and ||.

Signed-off-by: Paul Campbell <pcampb...@kemitix.net>
Signed-off-by: Simon Ruderich <si...@ruderich.org>
---

On Sun, Mar 24, 2013 at 07:37:42PM +0000, Paul Campbell wrote:
> Use a separate test invocation for each single test, combining them with
> && and ||, and use ordinary parentheses for grouping.

Hello Paul,

Parentheses are only necessary if both && and || are used to
enforce precedence; the shell can split the commands without
needing the parentheses. In these cases they can all be removed.

Regards
Simon

 contrib/subtree/git-subtree.sh | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 5701376..d02e6c5 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -119,7 +119,7 @@ esac
 
 dir="$(dirname "$prefix/.")"
 
-if [ "$command" != "pull" -a "$command" != "add" -a "$command" != "push" ]; 
then
+if test "$command" != "pull" && test "$command" != "add" && test "$command" != 
"push"; then
        revs=$(git rev-parse $default --revs-only "$@") || exit $?
        dirs="$(git rev-parse --no-revs --no-flags "$@")" || exit $?
        if [ -n "$dirs" ]; then
@@ -181,9 +181,9 @@ cache_set()
 {
        oldrev="$1"
        newrev="$2"
-       if [ "$oldrev" != "latest_old" \
-            -a "$oldrev" != "latest_new" \
-            -a -e "$cachedir/$oldrev" ]; then
+       if test "$oldrev" != "latest_old" \
+            && test "$oldrev" != "latest_new" \
+            && test -e "$cachedir/$oldrev"; then
                die "cache for $oldrev already exists!"
        fi
        echo "$newrev" >"$cachedir/$oldrev"
@@ -273,12 +273,12 @@ find_existing_splits()
                        git-subtree-split:) sub="$b" ;;
                        END)
                                debug "  Main is: '$main'"
-                               if [ -z "$main" -a -n "$sub" ]; then
+                               if test -z "$main" && test -n "$sub"; then
                                        # squash commits refer to a subtree
                                        debug "  Squash: $sq from $sub"
                                        cache_set "$sq" "$sub"
                                fi
-                               if [ -n "$main" -a -n "$sub" ]; then
+                               if test -n "$main" && test -n "$sub"; then
                                        debug "  Prior: $main -> $sub"
                                        cache_set $main $sub
                                        cache_set $sub $sub
@@ -541,7 +541,7 @@ cmd_add_commit()
        tree=$(git write-tree) || exit $?
        
        headrev=$(git rev-parse HEAD) || exit $?
-       if [ -n "$headrev" -a "$headrev" != "$rev" ]; then
+       if test -n "$headrev" && test "$headrev" != "$rev"; then
                headp="-p $headrev"
        else
                headp=
-- 
1.8.2

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