checkout: implement "-" abbreviation, add docs and tests

diff --git a/t/t4030-diff-textconv.sh b/t/t4030-diff-textconv.sh
index 03ba26a0de7d1bf41269cfb1f1b9f33b733482e1..2f27a0ba9ec002b1a6e4d3bd0ed1dc7484d4d14e 100755 (executable)
--- a/t/t4030-diff-textconv.sh
+++ b/t/t4030-diff-textconv.sh
@@ -21,7 +21,7 @@ EOF
 
 cat >hexdump <<'EOF'
 #!/bin/sh
-perl -e '$/ = undef; $_ = <>; s/./ord($&)/ge; print $_' "$1"
+perl -e '$/ = undef; $_ = <>; s/./ord($&)/ge; print $_' < "$1"
 EOF
 chmod +x hexdump
 
@@ -29,7 +29,7 @@ test_expect_success 'setup binary file with history' '
        printf "\\0\\n" >file &&
        git add file &&
        git commit -m one &&
-       printf "\\1\\n" >>file &&
+       printf "\\01\\n" >>file &&
        git add file &&
        git commit -m two
 '