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| <body class="manpage"> |
| <div id="header"> |
| <h1>git-bisect(1) Manual Page</h1> |
| <h2 id="_name">NAME</h2> |
| <div class="sectionbody"> |
| <p>git-bisect - Use binary search to find the commit that introduced a bug</p> |
| </div> |
| </div> |
| <div id="content"> |
| <div class="sect1"> |
| <h2 id="_synopsis">SYNOPSIS</h2> |
| <div class="sectionbody"> |
| <div class="verseblock"> |
| <pre class="content"><em>git bisect</em> <subcommand> <options></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_description">DESCRIPTION</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The command takes various subcommands, and different options depending |
| on the subcommand:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>git bisect start [--term-(bad|new)=<term-new> --term-(good|old)=<term-old>] |
| [--no-checkout] [--first-parent] [<bad> [<good>...]] [--] [<pathspec>...] |
| git bisect (bad|new|<term-new>) [<rev>] |
| git bisect (good|old|<term-old>) [<rev>...] |
| git bisect terms [--term-(good|old) | --term-(bad|new)] |
| git bisect skip [(<rev>|<range>)...] |
| git bisect reset [<commit>] |
| git bisect (visualize|view) |
| git bisect replay <logfile> |
| git bisect log |
| git bisect run <cmd> [<arg>...] |
| git bisect help</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This command uses a binary search algorithm to find which commit in |
| your project’s history introduced a bug. You use it by first telling |
| it a "bad" commit that is known to contain the bug, and a "good" |
| commit that is known to be before the bug was introduced. Then <code>git</code> |
| <code>bisect</code> picks a commit between those two endpoints and asks you |
| whether the selected commit is "good" or "bad". It continues narrowing |
| down the range until it finds the exact commit that introduced the |
| change.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In fact, <code>git</code> <code>bisect</code> can be used to find the commit that changed |
| <strong>any</strong> property of your project; e.g., the commit that fixed a bug, or |
| the commit that caused a benchmark’s performance to improve. To |
| support this more general usage, the terms "old" and "new" can be used |
| in place of "good" and "bad", or you can choose your own terms. See |
| section "Alternate terms" below for more information.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_basic_bisect_commands_start_bad_good">Basic bisect commands: start, bad, good</h3> |
| <div class="paragraph"> |
| <p>As an example, suppose you are trying to find the commit that broke a |
| feature that was known to work in version <code>v2.6.13-rc2</code> of your |
| project. You start a bisect session as follows:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start |
| $ git bisect bad # Current version is bad |
| $ git bisect good v2.6.13-rc2 # v2.6.13-rc2 is known to be good</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Once you have specified at least one bad and one good commit, <code>git</code> |
| <code>bisect</code> selects a commit in the middle of that range of history, |
| checks it out, and outputs something similar to the following:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>Bisecting: 675 revisions left to test after this (roughly 10 steps)</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You should now compile the checked-out version and test it. If that |
| version works correctly, type</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect good</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If that version is broken, type</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect bad</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Then <code>git</code> <code>bisect</code> will respond with something like</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>Bisecting: 337 revisions left to test after this (roughly 9 steps)</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Keep repeating the process: compile the tree, test it, and depending |
| on whether it is good or bad run <code>git</code> <code>bisect</code> <code>good</code> or <code>git</code> <code>bisect</code> <code>bad</code> |
| to ask for the next commit that needs testing.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Eventually there will be no more revisions left to inspect, and the |
| command will print out a description of the first bad commit. The |
| reference <code>refs/bisect/bad</code> will be left pointing at that commit.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_bisect_reset">Bisect reset</h3> |
| <div class="paragraph"> |
| <p>After a bisect session, to clean up the bisection state and return to |
| the original HEAD, issue the following command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect reset</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>By default, this will return your tree to the commit that was checked |
| out before <code>git</code> <code>bisect</code> <code>start</code>. (A new <code>git</code> <code>bisect</code> <code>start</code> will also do |
| that, as it cleans up the old bisection state.)</p> |
| </div> |
| <div class="paragraph"> |
| <p>With an optional argument, you can return to a different commit |
| instead:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect reset <commit></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>For example, <code>git</code> <code>bisect</code> <code>reset</code> <code>bisect/bad</code> will check out the first |
| bad revision, while <code>git</code> <code>bisect</code> <code>reset</code> <code>HEAD</code> will leave you on the |
| current bisection commit and avoid switching commits at all.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_alternate_terms">Alternate terms</h3> |
| <div class="paragraph"> |
| <p>Sometimes you are not looking for the commit that introduced a |
| breakage, but rather for a commit that caused a change between some |
| other "old" state and "new" state. For example, you might be looking |
| for the commit that introduced a particular fix. Or you might be |
| looking for the first commit in which the source-code filenames were |
| finally all converted to your company’s naming standard. Or whatever.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In such cases it can be very confusing to use the terms "good" and |
| "bad" to refer to "the state before the change" and "the state after |
| the change". So instead, you can use the terms "old" and "new", |
| respectively, in place of "good" and "bad". (But note that you cannot |
| mix "good" and "bad" with "old" and "new" in a single session.)</p> |
| </div> |
| <div class="paragraph"> |
| <p>In this more general usage, you provide <code>git</code> <code>bisect</code> with a "new" |
| commit that has some property and an "old" commit that doesn’t have that |
| property. Each time <code>git</code> <code>bisect</code> checks out a commit, you test if that |
| commit has the property. If it does, mark the commit as "new"; |
| otherwise, mark it as "old". When the bisection is done, <code>git</code> <code>bisect</code> |
| will report which commit introduced the property.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To use "old" and "new" instead of "good" and bad, you must run <code>git</code> |
| <code>bisect</code> <code>start</code> without commits as argument and then run the following |
| commands to add the commits:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect old [<rev>]</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>to indicate that a commit was before the sought change, or</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect new [<rev>...]</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>to indicate that it was after.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To get a reminder of the currently used terms, use</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect terms</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You can get just the old term with <code>git</code> <code>bisect</code> <code>terms</code> <code>--term-old</code> |
| or <code>git</code> <code>bisect</code> <code>terms</code> <code>--term-good</code>; <code>git</code> <code>bisect</code> <code>terms</code> <code>--term-new</code> |
| and <code>git</code> <code>bisect</code> <code>terms</code> <code>--term-bad</code> can be used to learn how to call |
| the commits more recent than the sought change.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you would like to use your own terms instead of "bad"/"good" or |
| "new"/"old", you can choose any names you like (except existing bisect |
| subcommands like <code>reset</code>, <code>start</code>, …​) by starting the |
| bisection using</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect start --term-old <term-old> --term-new <term-new></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>For example, if you are looking for a commit that introduced a |
| performance regression, you might use</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect start --term-old fast --term-new slow</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Or if you are looking for the commit that fixed a bug, you might use</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>git bisect start --term-new fixed --term-old broken</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Then, use <code>git</code> <code>bisect</code> <em><term-old></em> and <code>git</code> <code>bisect</code> <em><term-new></em> instead |
| of <code>git</code> <code>bisect</code> <code>good</code> and <code>git</code> <code>bisect</code> <code>bad</code> to mark commits.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_bisect_visualizeview">Bisect visualize/view</h3> |
| <div class="paragraph"> |
| <p>To see the currently remaining suspects in <em>gitk</em>, issue the following |
| command during the bisection process (the subcommand <code>view</code> can be used |
| as an alternative to <code>visualize</code>):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect visualize</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Git detects a graphical environment through various environment variables: |
| <code>DISPLAY</code>, which is set in X Window System environments on Unix systems. |
| <code>SESSIONNAME</code>, which is set under Cygwin in interactive desktop sessions. |
| <code>MSYSTEM</code>, which is set under Msys2 and Git for Windows. |
| <code>SECURITYSESSIONID</code>, which may be set on macOS in interactive desktop sessions.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If none of these environment variables is set, <em>git log</em> is used instead. |
| You can also give command-line options such as <code>-p</code> and <code>--stat</code>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect visualize --stat</pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_bisect_log_and_bisect_replay">Bisect log and bisect replay</h3> |
| <div class="paragraph"> |
| <p>After having marked revisions as good or bad, issue the following |
| command to show what has been done so far:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect log</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If you discover that you made a mistake in specifying the status of a |
| revision, you can save the output of this command to a file, edit it to |
| remove the incorrect entries, and then issue the following commands to |
| return to a corrected state:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect reset |
| $ git bisect replay that-file</pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_avoiding_testing_a_commit">Avoiding testing a commit</h3> |
| <div class="paragraph"> |
| <p>If, in the middle of a bisect session, you know that the suggested |
| revision is not a good one to test (e.g. it fails to build and you |
| know that the failure does not have anything to do with the bug you |
| are chasing), you can manually select a nearby commit and test that |
| one instead.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect good/bad # previous round was good or bad. |
| Bisecting: 337 revisions left to test after this (roughly 9 steps) |
| $ git bisect visualize # oops, that is uninteresting. |
| $ git reset --hard HEAD~3 # try 3 revisions before what |
| # was suggested</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Then compile and test the chosen revision, and afterwards mark |
| the revision as good or bad in the usual manner.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_bisect_skip">Bisect skip</h3> |
| <div class="paragraph"> |
| <p>Instead of choosing a nearby commit by yourself, you can ask Git to do |
| it for you by issuing the command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect skip # Current version cannot be tested</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>However, if you skip a commit adjacent to the one you are looking for, |
| Git will be unable to tell exactly which of those commits was the |
| first bad one.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can also skip a range of commits, instead of just one commit, |
| using range notation. For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect skip v2.5..v2.6</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This tells the bisect process that no commit after <code>v2.5</code>, up to and |
| including <code>v2.6</code>, should be tested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Note that if you also want to skip the first commit of the range you |
| would issue the command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect skip v2.5 v2.5..v2.6</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This tells the bisect process that the commits between <code>v2.5</code> and |
| <code>v2.6</code> (inclusive) should be skipped.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_cutting_down_bisection_by_giving_more_parameters_to_bisect_start">Cutting down bisection by giving more parameters to bisect start</h3> |
| <div class="paragraph"> |
| <p>You can further cut down the number of trials, if you know what part of |
| the tree is involved in the problem you are tracking down, by specifying |
| pathspec parameters when issuing the <code>bisect</code> <code>start</code> command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start -- arch/i386 include/asm-i386</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If you know beforehand more than one good commit, you can narrow the |
| bisect space down by specifying all of the good commits immediately after |
| the bad commit when issuing the <code>bisect</code> <code>start</code> command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start v2.6.20-rc6 v2.6.20-rc4 v2.6.20-rc1 -- |
| # v2.6.20-rc6 is bad |
| # v2.6.20-rc4 and v2.6.20-rc1 are good</pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_bisect_run">Bisect run</h3> |
| <div class="paragraph"> |
| <p>If you have a script that can tell if the current source code is good |
| or bad, you can bisect by issuing the command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect run my_script arguments</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Note that the script (<code>my_script</code> in the above example) should exit |
| with code 0 if the current source code is good/old, and exit with a |
| code between 1 and 127 (inclusive), except 125, if the current source |
| code is bad/new.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Any other exit code will abort the bisect process. It should be noted |
| that a program that terminates via <code>exit</code>(<code>-1</code>) leaves $? = 255, (see the |
| exit(3) manual page), as the value is chopped with & <code>0377</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The special exit code 125 should be used when the current source code |
| cannot be tested. If the script exits with this code, the current |
| revision will be skipped (see <code>git</code> <code>bisect</code> <code>skip</code> above). 125 was chosen |
| as the highest sensible value to use for this purpose, because 126 and 127 |
| are used by POSIX shells to signal specific error status (127 is for |
| command not found, 126 is for command found but not executable—​these |
| details do not matter, as they are normal errors in the script, as far as |
| <code>bisect</code> <code>run</code> is concerned).</p> |
| </div> |
| <div class="paragraph"> |
| <p>You may often find that during a bisect session you want to have |
| temporary modifications (e.g. s/#define DEBUG 0/#define DEBUG 1/ in a |
| header file, or "revision that does not have this commit needs this |
| patch applied to work around another problem this bisection is not |
| interested in") applied to the revision being tested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To cope with such a situation, after the inner <em>git bisect</em> finds the |
| next revision to test, the script can apply the patch |
| before compiling, run the real test, and afterwards decide if the |
| revision (possibly with the needed patch) passed the test and then |
| rewind the tree to the pristine state. Finally the script should exit |
| with the status of the real test to let the <code>git</code> <code>bisect</code> <code>run</code> command loop |
| determine the eventual outcome of the bisect session.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_options">OPTIONS</h2> |
| <div class="sectionbody"> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1">--no-checkout</dt> |
| <dd> |
| <div class="paragraph"> |
| <p>Do not checkout the new working tree at each iteration of the bisection |
| process. Instead just update the reference named <code>BISECT_HEAD</code> to make |
| it point to the commit that should be tested.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This option may be useful when the test you would perform in each step |
| does not require a checked out tree.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the repository is bare, <code>--no-checkout</code> is assumed.</p> |
| </div> |
| </dd> |
| <dt class="hdlist1">--first-parent</dt> |
| <dd> |
| <div class="paragraph"> |
| <p>Follow only the first parent commit upon seeing a merge commit.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In detecting regressions introduced through the merging of a branch, the merge |
| commit will be identified as introduction of the bug and its ancestors will be |
| ignored.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This option is particularly useful in avoiding false positives when a merged |
| branch contained broken or non-buildable commits, but the merge itself was OK.</p> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_examples">EXAMPLES</h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Automatically bisect a broken build between v1.2 and HEAD:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start HEAD v1.2 -- # HEAD is bad, v1.2 is good |
| $ git bisect run make # "make" builds the app |
| $ git bisect reset # quit the bisect session</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Automatically bisect a test failure between origin and HEAD:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start HEAD origin -- # HEAD is bad, origin is good |
| $ git bisect run make test # "make test" builds and tests |
| $ git bisect reset # quit the bisect session</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Automatically bisect a broken test case:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ cat ~/test.sh |
| #!/bin/sh |
| make || exit 125 # this skips broken builds |
| ~/check_test_case.sh # does the test case pass? |
| $ git bisect start HEAD HEAD~10 -- # culprit is among the last 10 |
| $ git bisect run ~/test.sh |
| $ git bisect reset # quit the bisect session</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Here we use a <code>test.sh</code> custom script. In this script, if <code>make</code> |
| fails, we skip the current commit. |
| <code>check_test_case.sh</code> should <code>exit</code> <code>0</code> if the test case passes, |
| and <code>exit</code> <code>1</code> otherwise.</p> |
| </div> |
| <div class="paragraph"> |
| <p>It is safer if both <code>test.sh</code> and <code>check_test_case.sh</code> are |
| outside the repository to prevent interactions between the bisect, |
| make and test processes and the scripts.</p> |
| </div> |
| </li> |
| <li> |
| <p>Automatically bisect with temporary modifications (hot-fix):</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ cat ~/test.sh |
| #!/bin/sh |
| |
| # tweak the working tree by merging the hot-fix branch |
| # and then attempt a build |
| if git merge --no-commit --no-ff hot-fix && |
| make |
| then |
| # run project specific test and report its status |
| ~/check_test_case.sh |
| status=$? |
| else |
| # tell the caller this is untestable |
| status=125 |
| fi |
| |
| # undo the tweak to allow clean flipping to the next commit |
| git reset --hard |
| |
| # return control |
| exit $status</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This applies modifications from a hot-fix branch before each test run, |
| e.g. in case your build or test environment changed so that older |
| revisions may need a fix which newer ones have already. (Make sure the |
| hot-fix branch is based off a commit which is contained in all revisions |
| which you are bisecting, so that the merge does not pull in too much, or |
| use <code>git</code> <code>cherry-pick</code> instead of <code>git</code> <code>merge</code>.)</p> |
| </div> |
| </li> |
| <li> |
| <p>Automatically bisect a broken test case:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start HEAD HEAD~10 -- # culprit is among the last 10 |
| $ git bisect run sh -c "make || exit 125; ~/check_test_case.sh" |
| $ git bisect reset # quit the bisect session</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>This shows that you can do without a run script if you write the test |
| on a single line.</p> |
| </div> |
| </li> |
| <li> |
| <p>Locate a good region of the object graph in a damaged repository</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start HEAD <known-good-commit> [ <boundary-commit> ... ] --no-checkout |
| $ git bisect run sh -c ' |
| GOOD=$(git for-each-ref "--format=%(objectname)" refs/bisect/good-*) && |
| git rev-list --objects BISECT_HEAD --not $GOOD >tmp.$$ && |
| git pack-objects --stdout >/dev/null <tmp.$$ |
| rc=$? |
| rm -f tmp.$$ |
| test $rc = 0' |
| |
| $ git bisect reset # quit the bisect session</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>In this case, when <em>git bisect run</em> finishes, bisect/bad will refer to a commit that |
| has at least one parent whose reachable graph is fully traversable in the sense |
| required by <em>git pack objects</em>.</p> |
| </div> |
| </li> |
| <li> |
| <p>Look for a fix instead of a regression in the code</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start |
| $ git bisect new HEAD # current commit is marked as new |
| $ git bisect old HEAD~10 # the tenth commit from now is marked as old</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>or:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ git bisect start --term-old broken --term-new fixed |
| $ git bisect fixed |
| $ git bisect broken HEAD~10</pre> |
| </div> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="sect2"> |
| <h3 id="_getting_help">Getting help</h3> |
| <div class="paragraph"> |
| <p>Use <code>git</code> <code>bisect</code> to get a short usage description, and <code>git</code> <code>bisect</code> |
| <code>help</code> or <code>git</code> <code>bisect</code> <code>-h</code> to get a long usage description.</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_see_also">SEE ALSO</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p><a href="git-bisect-lk2009.html">Fighting regressions with git bisect</a>, |
| <a href="git-blame.html">git-blame(1)</a>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_git">GIT</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Part of the <a href="git.html">git(1)</a> suite</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2025-06-20 18:10:42 -0700 |
| </div> |
| </div> |
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