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[PATCH 1/2] cat-file doc: document that -e will return some output

The -e option added in 7950571ad7 ("A few more options for
git-cat-file", 2005-12-03) has always errored out with message on
stderr saying that the provided object is malformed, currently:

    $ git cat-file -e malformed; echo $?
    fatal: Not a valid object name malformed

A careful reader of this documentation would be mislead into thinking
the could write:

    if ! git cat-file -e "$object" [...]

As opposed to:

    if ! git cat-file -e "$object" 2>/dev/null [...]

To check whether some arbitrary $object string was both valid, and
pointed to an object that exists.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
 Documentation/git-cat-file.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index fb09cd69d6..f90f09b03f 100644
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -42,8 +42,9 @@ OPTIONS
-	Suppress all output; instead exit with zero status if <object>
-	exists and is a valid object.
+	Exit with zero status if <object> exists and is a valid
+	object. If <object> is of an invalid format exit with non-zero and
+	emits an error on stderr.
 	Pretty-print the contents of <object> based on its type.
@@ -168,7 +169,7 @@ If `-t` is specified, one of the <type>.
 If `-s` is specified, the size of the <object> in bytes.
-If `-e` is specified, no output.
+If `-e` is specified, no output, unless the <object> is malformed.
 If `-p` is specified, the contents of <object> are pretty-printed.