man diff 与安装的 diff 版本不对应

Question

执行 man diff 会告诉以下内容：

NAME
       diff - compare files line by line

SYNOPSIS
       diff [OPTION]... FILES

DESCRIPTION
       Compare files line by line.

       -i  --ignore-case
              Ignore case differences in file contents.

[...]
       -q  --brief
              Output only whether files differ.
[...]

但是当我使用 -q 选项时，它失败并显示 fatal: invalid diff option/value: -q

为什么diff命令的man和安装的版本不对应？

如何解决？

有没有带有 -q 选项的 diff 命令版本的 brew 包？ (brew coreutils 和 binutils 没有 diff 命令)

OSX 10.11.5

更新您的问题

$ which diff
/usr/bin/diff

$ diff --version
usage: git diff --no-index <path> <path>

$ diff -v
usage: git diff --no-index <path> <path>

$ command diff --version
diff (GNU diffutils) 2.8.1

我使用 brew 和 https://github.com/donnemartin/dev-setup

如果我禁用由 dev-setup 安装的 .bash_profile，那么 which diff 仍然 returns 相同的路径，但 diff -q 有效。

Answer 1

你有没有使用过 pretzo 或类似的东西？像这样的一些框架将（糟糕地）定义自己的函数来替换终端默认函数。

在这种情况下，请尝试运行 command diff -q ... 看看是否可以解决问题。

Edit：正如@MarkPlotnick 所指出的，dev-setup 是另一个框架，它覆盖了默认的 diff 命令并使用 git diff 代替：

# Use Git’s colored diff when available
hash git &>/dev/null;
if [ $? -eq 0 ]; then
    function diff() {
        git diff --no-index --color-words "$@";
    }
fi;

参考：https://github.com/donnemartin/dev-setup/blob/master/.functions

man diff 与安装的 diff 版本不对应

man diff does not correspond to the diff version installed

unix

macos

manpage