让 git diff 不打印到终端

Question

如果我做less somefile.txt或man bash（内部使用less），它会显示内容，但按Q后，内容就会消失。

git diff 也使用less，但输出仍保留在控制台中。如何使git 与man 行为相同？

---

当前行为

me@mypc:~$ git diff
# I look at the diff and then press q. But it's all printed to the console
diff --git a/somefile.txt b/somefile.txt
...
...
...
me@mypc:~$
me@mypc:~$ less somefile.txt
# I look at the file content, but after I press q, console appears and nothing is printed there
me@mypc:~$

我意识到 git 的行为就像less -X，那么如果没有这个选项，我怎么能强制 git 少运行呢？

Answer 1

这是less -F -X的效果；在git-config(1) 中查看core.pager。

来自less(1)：

   -F or --quit-if-one-screen
          Causes less to automatically exit if the entire file can be dis‐
          played on the first screen.

   -X or --no-init
          Disables sending the termcap initialization and deinitialization
          strings  to  the  terminal.   This is sometimes desirable if the
          deinitialization string does something unnecessary, like  clear‐
          ing the screen.

这里提到的“init”的一部分涉及到切换到备用屏幕，以便保留主屏幕。

---

来自git-config(1)：

   core.pager
       Text viewer for use by Git commands (e.g., less). The value is
       meant to be interpreted by the shell. The order of preference is
       the $GIT_PAGER environment variable, then core.pager configuration,
       then $PAGER, and then the default chosen at compile time (usually
       less).

       When the LESS environment variable is unset, Git sets it to FRX (if
       LESS environment variable is set, Git does not change it at all).
       If you want to selectively override Git’s default setting for LESS,
       you can set core.pager to e.g.  less -S. This will be passed to the
       shell by Git, which will translate the final command to LESS=FRX
       less -S. The environment does not set the S option but the command
       line does, instructing less to truncate long lines. Similarly,
       setting core.pager to less -+F will deactivate the F option
       specified by the environment from the command-line, deactivating
       the "quit if one screen" behavior of less. One can specifically
       activate some flags for particular commands: for example, setting
       pager.blame to less -S enables line truncation only for git blame.

       Likewise, when the LV environment variable is unset, Git sets it to
       -c. You can override this setting by exporting LV with another
       value or setting core.pager to lv +c.