Documentation / git-symbolic-ref.txton commit Documentation: explain push.default option a bit more (185c087)
   1git-symbolic-ref(1)
   2===================
   3
   4NAME
   5----
   6git-symbolic-ref - Read and modify symbolic refs
   7
   8SYNOPSIS
   9--------
  10[verse]
  11'git symbolic-ref' [-m <reason>] <name> <ref>
  12'git symbolic-ref' [-q] [--short] <name>
  13
  14DESCRIPTION
  15-----------
  16Given one argument, reads which branch head the given symbolic
  17ref refers to and outputs its path, relative to the `.git/`
  18directory.  Typically you would give `HEAD` as the <name>
  19argument to see which branch your working tree is on.
  20
  21Given two arguments, creates or updates a symbolic ref <name> to
  22point at the given branch <ref>.
  23
  24A symbolic ref is a regular file that stores a string that
  25begins with `ref: refs/`.  For example, your `.git/HEAD` is
  26a regular file whose contents is `ref: refs/heads/master`.
  27
  28OPTIONS
  29-------
  30
  31-q::
  32--quiet::
  33        Do not issue an error message if the <name> is not a
  34        symbolic ref but a detached HEAD; instead exit with
  35        non-zero status silently.
  36
  37--short::
  38        When showing the value of <name> as a symbolic ref, try to shorten the
  39        value, e.g. from `refs/heads/master` to `master`.
  40
  41-m::
  42        Update the reflog for <name> with <reason>.  This is valid only
  43        when creating or updating a symbolic ref.
  44
  45NOTES
  46-----
  47In the past, `.git/HEAD` was a symbolic link pointing at
  48`refs/heads/master`.  When we wanted to switch to another branch,
  49we did `ln -sf refs/heads/newbranch .git/HEAD`, and when we wanted
  50to find out which branch we are on, we did `readlink .git/HEAD`.
  51But symbolic links are not entirely portable, so they are now
  52deprecated and symbolic refs (as described above) are used by
  53default.
  54
  55'git symbolic-ref' will exit with status 0 if the contents of the
  56symbolic ref were printed correctly, with status 1 if the requested
  57name is not a symbolic ref, or 128 if another error occurs.
  58
  59GIT
  60---
  61Part of the linkgit:git[1] suite