input stringlengths 2 68 | stderr stringlengths 0 1.08k | expected listlengths 1 4 | source stringclasses 2
values | note stringlengths 27 285 ⌀ |
|---|---|---|---|---|
java file.java | could not find or load main class | [
"java file"
] | nofaq | Deduped with the byte-near-identical testdata1 variant (stderr 'could not find or locate class'). |
java bcd.java | could not find or load main class | [
"java bcd"
] | nofaq | Deduped with the testdata1 variant. |
java a.java | could not find or load main class | [
"java a"
] | nofaq | Deduped with the testdata1 variant. |
apt-get abc | command not found | [
"sudo apt-get install abc"
] | nofaq | stderr is the dataset's compressed form; fix (add sudo + install) is derivable from the input alone. |
apt-get qwerty | command not found | [
"sudo apt-get install qwerty"
] | nofaq | null |
apt-get xyzz | command not found | [
"sudo apt-get install xyzz"
] | nofaq | null |
cargo | [
"cargo build"
] | nofaq | Bare cargo is an incomplete command; 'cargo build' is the canonical default completion (same rule exists in thefuck). | |
cd files | -bash: cd: files: no such file or directory | [
"mkdir files; cd files"
] | nofaq | null |
cd code | -bash: cd: code: no such file or dir | [
"mkdir code; cd code"
] | nofaq | null |
cd xray | -bash: cd: xray: no such file or dir | [
"mkdir xray; cd xray"
] | nofaq | null |
cd.. | -bash: cd..: command not found | [
"cd .."
] | nofaq | Deduped with thefuck rule cd_parent (identical input and fix; thefuck's stderr lacks only the '-bash: ' prefix). |
bash abcabc.sh | /etc/init.d/abcabc.sh: line 2: $'\r': command not found /etc/init.d/abcabc.sh: | [
"dos2unix abcabc.sh; bash abcabc.sh"
] | nofaq | null |
bash cbad.sh | /etc/cbad.sh: line 13: $'\r': command not found /etc/cbad.sh | [
"dos2unix cbad.sh; bash cbad.sh"
] | nofaq | null |
bash xyz.sh | /etc/etc/etc/xyz.sh: line 134: $'\r': command not found /etc/etc/etc/xyz.sh | [
"dos2unix xyz.sh; bash xyz.sh"
] | nofaq | null |
./manage.py | -bash: ./manage.py: Permission denied | [
"chmod +x manage.py; ./manage.py",
"python manage.py"
] | nofaq | This (input, stderr) pair appears in 2 separate benchmark groups with different fixes; all listed fixes are accepted. |
./asdf.py | -bash: ./asdf.py: Permission denied | [
"chmod +x asdf.py; ./asdf.py",
"python asdf.py"
] | nofaq | Both source fixes accepted. |
./xyz.py | -bash: ./xyz.py: Permission denied | [
"chmod +x xyz.py; ./xyz.py",
"python xyz.py"
] | nofaq | Both source fixes accepted. |
./manage.py migrate myapp | django.db.utils.DatabaseError: table 'myapp_tablename' already exists | [
"./manage.py migrate myapp --fake"
] | nofaq | null |
./manage.py migrate anapp1 | django.db.utils.DatabaseError: table 'anapp1_tablename2' already exists | [
"./manage.py migrate anapp1 --fake"
] | nofaq | null |
./manage.py migrate xyzapp11 | django.db.utils.DatabaseError: table 'xyzapp11_tablename22' already exists | [
"./manage.py migrate xyzapp11 --fake"
] | nofaq | null |
python manage.py migrate reserve | south.exceptions.GhostMigrations: ! These migrations are in the database but not on disk: <reserve: 0002_initial> ! with the south_migrationhistory table, or pass --delete-ghost-migrations | [
"python manage.py migrate reserve --delete-ghost-migrations"
] | nofaq | null |
git commit file | error: pathspec 'application/libraries/file' did not match any file(s) known to git. | [
"git add file; git commit file"
] | nofaq | null |
git commit afile1 | error: pathspec 'application/libra/afile1' did not match any file(s) known to git. | [
"git add afile1; git commit afile1"
] | nofaq | null |
git commit bfile12 | error: pathspec 'application/libra2/bfile12' did not match any file(s) known to git. | [
"git add bfile12; git commit bfile12"
] | nofaq | null |
git branch -d testing | error: The branch 'testing' is not fully merged. If you are sure you want to delete it, run 'git branch -D testing'. | [
"git branch -D testing"
] | nofaq | null |
git branch -d featurebranch | error: The branch 'featurebranch' is not fully merged. If you are sure you want to delete it, run 'git branch -D featurebranch'. | [
"git branch -D featurebranch"
] | nofaq | null |
git branch -d bugfix | error: The branch 'bugfix' is not fully merged. If you are sure you want to delete it, run 'git branch -D bugfix'. | [
"git branch -D bugfix"
] | nofaq | null |
git branch list | [
"git branch --delete list; git branch"
] | nofaq | Classic mistake: 'git branch list' silently creates a branch named 'list'; fix deletes it and lists branches. | |
git branch somelist1 | [
"git branch --delete somelist1; git branch"
] | nofaq | null | |
git branch abc | [
"git branch --delete abc; git branch"
] | nofaq | null | |
git pull | Updating 1..2
error: Your local changes to the following files would be overwritten by merge:
foo2.txt
Please, commit your changes or stash them before you can merge.
Aborting
| [
"git stash"
] | nofaq | Collapsed from three source variants differing only in the file named in stderr (foo2.txt/bar.txt/et.txt). |
git add . -all | [
"git add . --all",
"git add . -A"
] | nofaq | 'git add . -A' added: -A is git's documented exact alias of --all. | |
git checkout gh-pages | error: Your local changes to the following files would be overwritten by checkout: somefile.txt, Please, commit your changes or stash them before you can switch branches. | [
"git checkout -f gh-pages",
"git reset --hard; git checkout gh-pages"
] | nofaq | Both source fixes accepted (two benchmark groups for this error class). |
git checkout proj | error: Your local changes to the following files would be overwritten by checkout: abc.java, Please, commit your changes or stash them before you can switch branches. | [
"git checkout -f proj",
"git reset --hard; git checkout proj"
] | nofaq | Both source fixes accepted. |
git checkout bravo | error: Your local changes to the following files would be overwritten by checkout: xyz.fs, Please, commit your changes or stash them before you can switch branches. | [
"git checkout -f bravo",
"git reset --hard; git checkout bravo"
] | nofaq | Both source fixes accepted. |
go run blabla | error: go run: no go files listed | [
"go run blabla.go"
] | nofaq | null |
go run abcd | error: go run: no go files listed | [
"go run abcd.go"
] | nofaq | null |
go run xyz | error: go run: no go files listed | [
"go run xyz.go"
] | nofaq | null |
heroku luck | ! `luck` is not a heroku command.
! Perhaps you meant `lock`.
! See `heroku help` for a list of available commands. | [
"heroku lock"
] | nofaq | null |
heroku ad | ! `ad` is not a heroku command.
! Perhaps you meant `da`.
! See `heroku help` for a list of available commands. | [
"heroku da"
] | nofaq | Synthetic paper variant; fix is read directly from the stderr suggestion. |
heroku abc | ! `abc` is not a heroku command.
! Perhaps you meant `cba`.
! See `heroku help` for a list of available commands. | [
"heroku cba"
] | nofaq | Synthetic paper variant; fix is read directly from the stderr suggestion. |
lein ropl | 'ropl' is not a task. See 'lein help'.
Did you mean this?
repl | [
"lein repl"
] | nofaq | null |
lein od | 'od' is not a task. See 'lein help'.
Did you mean this?
do | [
"lein do"
] | nofaq | null |
lein bar | 'bar' is not a task. See 'lein help'.
Did you mean this?
jar | [
"lein jar"
] | nofaq | null |
cmd.sh | -bash: cmd.sh: command not found | [
"./cmd.sh"
] | nofaq | null |
abcc.sh | -bash: abcc.sh: command not found | [
"./abcc.sh"
] | nofaq | null |
scanner.sh | -bash: scanner.sh: command not found | [
"./scanner.sh"
] | nofaq | null |
java foo.java | Error: Could not find or load main class foo.java | [
"java foo"
] | nofaq | null |
java xyzz.java | Error: Could not find or load main class xyzz.java | [
"java xyzz"
] | nofaq | null |
java abcdef.java | Error: Could not find or load main class abcdef.java | [
"java abcdef"
] | nofaq | null |
javac foo | error: Class names, 'foo', are only accepted if annotation processing is explicitly requested
1 error | [
"javac foo.java"
] | nofaq | null |
javac barr | error: Class names, 'barr', are only accepted if annotation processing is explicitly requested
1 error | [
"javac barr.java"
] | nofaq | null |
javac yadda | error: Class names, 'yadda', are only accepted if annotation processing is explicitly requested
1 error | [
"javac yadda.java"
] | nofaq | null |
manmkdir | -bash: manmkdir: command not found | [
"man mkdir"
] | nofaq | null |
manstat | -bash: manstat: command not found | [
"man stat"
] | nofaq | null |
mkdir a/b | mkdir: cannot create directory '/a' : no such file or directory | [
"mkdir -p a/b"
] | nofaq | null |
mkdir bc/cd | mkdir: cannot create directory '/bc' : no such file or directory | [
"mkdir -p bc/cd"
] | nofaq | null |
mkdir xy/yzz | mkdir: cannot create directory '/xy' : no such file or directory | [
"mkdir -p xy/yzz"
] | nofaq | null |
mv a.txt dir/b.txt | cannot move 'a.txt' to 'dir/b.txt': Not a directory | [
"mkdir -p dir; mv a.txt dir/b.txt"
] | nofaq | null |
mv xyz.fs 1abc/cd.fs | cannot move 'xyz.fs' to '1abc/cd.fs': Not a directory | [
"mkdir -p 1abc; mv xyz.fs 1abc/cd.fs"
] | nofaq | null |
mv file.tar somestuff/bcd2.tar | cannot move 'file.tar' to 'somestuff/bcd2.tar': Not a directory | [
"mkdir -p somestuff; mv file.tar somestuff/bcd2.tar"
] | nofaq | null |
open www.a.com | The file /Users/lorisdanto/www.a.com does not exist. Perhaps you meant 'http://www.a.com'? | [
"open http://www.a.com"
] | nofaq | null |
open www.bcd.com | The file /Users/bob/www.bcd.com does not exist. Perhaps you meant 'http://www.bcd.com'? | [
"open http://www.bcd.com"
] | nofaq | null |
open www.cdef.com | The file /Users/sumit/www.cde.com does not exist. Perhaps you meant 'http://www.cdef.com'? | [
"open http://www.cdef.com"
] | nofaq | Dataset typo: the path portion of stderr says www.cde.com, but the suggestion (which drives the fix) is consistent. |
python blabla | python: can't open file 'blabla': [Errno 2] No such file or directory | [
"python blabla.py"
] | nofaq | null |
python xyzz | python: can't open file 'xyzz': [Errno 2] No such file or directory | [
"python xyzz.py"
] | nofaq | null |
python abc | python: can't open file 'abc': [Errno 2] No such file or directory | [
"python abc.py"
] | nofaq | null |
rm blabla | rm: blabla: is a directory | [
"rm -rf blabla"
] | nofaq | null |
rm xyzz | rm: xyzz: is a directory | [
"rm -rf xyzz"
] | nofaq | null |
rm abc | rm: abc: is a directory | [
"rm -rf abc"
] | nofaq | null |
pip instol | ERROR: unknown command ‘instol’ - maybe you meant ‘install’ | [
"pip install"
] | nofaq | null |
pip xyzz | ERROR: unknown command ‘xyzz’ - maybe you meant ‘zzyx’ | [
"pip zzyx"
] | nofaq | Synthetic paper variant; fix is read directly from the stderr suggestion. |
pip abc | ERROR: unknown command ‘abc’ - maybe you meant ‘cba’ | [
"pip cba"
] | nofaq | Synthetic paper variant; fix is read directly from the stderr suggestion. |
mknod blabla b 1 2 | mknod: blabla: operation not permitted | [
"sudo mknod blabla b 1 2"
] | nofaq | null |
mknod qwe b 1 2 | mknod: qwe: operation not permitted | [
"sudo mknod qwe b 1 2"
] | nofaq | null |
mknod xyzz b 1 2 | mknod: xyzz: operation not permitted | [
"sudo mknod xyzz b 1 2"
] | nofaq | null |
test.py | command not found | [
"py.test"
] | nofaq | null |
vagrant blabla | VM must be running to open SSH connection. Run `vagrant up`
to start the virtual machine. | [
"vagrant up"
] | nofaq | Placeholder subcommand (stands in for vagrant ssh); fix is read directly from the genuine stderr. |
vagrant abcd | VM must be running to open SSH connection. Run `vagrant up`
to start the virtual machine. | [
"vagrant up"
] | nofaq | null |
vagrant xyz | VM must be running to open SSH connection. Run `vagrant up`
to start the virtual machine. | [
"vagrant up"
] | nofaq | null |
touch a/b.txt | touch: a/b.txt: no such file or dir | [
"mkdir -p a; touch a/b.txt"
] | nofaq | null |
touch gamma/beta.jpg | touch: gamma/beta.jpg: no such file or dir | [
"mkdir -p gamma; touch gamma/beta.jpg"
] | nofaq | null |
touch go/air.fs | touch: go/air.fs: no such file or dir | [
"mkdir -p go; touch go/air.fs"
] | nofaq | null |
tsuru app-abcabcabc | You're not authenticated or your session has expired. Please use "login" command for authentication | [
"tsuru login"
] | nofaq | null |
tsuru pool-xyzz | You're not authenticated or your session has expired. Please use "login" command for authentication | [
"tsuru login"
] | nofaq | null |
tsuru prog-log | You're not authenticated or your session has expired. Please use "login" command for authentication | [
"tsuru login"
] | nofaq | null |
git config --global core.excludefile .gitignore_global | .gitignore not updated | [
"git config --global core.excludesfile ~/.gitignore_global"
] | nofaq | stderr is a dataset paraphrase (git config fails silently here); the correction is the classic excludesfile key-name fix. |
git branch -d remotes/origin/bugfix | failed to delete remote branch | [
"git push origin --delete bugfix"
] | nofaq | stderr is a dataset paraphrase; the correction is the canonical remote-branch-delete fix. |
git branch -d remotes/origin/prog | failed to delete remote branch | [
"git push origin --delete prog"
] | nofaq | null |
git branch -d remotes/origin/xyz | failed to delete remote branch | [
"git push origin --delete xyz"
] | nofaq | null |
git branch -rd origin/bugfix | failed to delete remote branch | [
"git push origin --delete bugfix"
] | nofaq | null |
git branch -rd origin/prog | failed to delete remote branch | [
"git push origin --delete prog"
] | nofaq | null |
git branch -rd origin/xyz | failed to delete remote branch | [
"git push origin --delete xyz"
] | nofaq | null |
git checkout $blahblah | fatal: git checkout: updating paths is incompatible with switching branches/forcing | [
"git checkout HEAD $blahblah"
] | nofaq | null |
git checkout $abcd | fatal: git checkout: updating paths is incompatible with switching branches/forcing | [
"git checkout HEAD $abcd"
] | nofaq | null |
git checkout $xyz | fatal: git checkout: updating paths is incompatible with switching branches/forcing | [
"git checkout HEAD $xyz"
] | nofaq | null |
git pull origin master | error: Couldn't set ORIG_HEAD. fatal: Cannot update the ref 'ORIG_HEAD'. | [
"git gc --prune=now"
] | nofaq | null |
git pull origin master | Your local changes to the following files would be overwritten by merge: user.v1234.suo | [
"git rm --cached user.v1234.suo",
"git stash"
] | nofaq | 'git stash' added as an accepted alternate: NoFAQ itself uses it as the fix for the same overwritten-by-merge error elsewhere. |
git pull origin master | Your local changes to the following files would be overwritten by merge: user.abcd.suo | [
"git rm --cached user.abcd.suo",
"git stash"
] | nofaq | 'git stash' added as an accepted alternate (see sibling scenario). |
git pull origin master | Your local changes to the following files would be overwritten by merge: user.xyz.suo | [
"git rm --cached user.xyz.suo",
"git stash"
] | nofaq | 'git stash' added as an accepted alternate (see sibling scenario). |
End of preview. Expand in Data Studio
mash-bench
203 real-world shell-command repair scenarios for evaluating command correction models — as of Aug 2026, the first benchmark for this task. Each scenario is a wrong/garbled command as a human actually typed it, the stderr it produced (187/203 have it), and one or more acceptable corrections.
{"input": "cd..", "stderr": "-bash: cd..: command not found", "expected": ["cd .."], "source": "nofaq"}
{"input": "git brnch", "stderr": "git: 'brnch' is not a git command. See 'git --help'.", "expected": ["git branch"], "source": "thefuck"}
Sources
- nofaq (139 scenarios) — the artifact of NoFAQ: Synthesizing Command
Repairs from Examples (D'Antoni, Singh, Vaughn; ESEC/FSE 2017),
MichaelBVaughn/NoFAQ, MIT.
Extracted from
Synthesis/RuleRepair/TestExamples.fs. - thefuck (64 scenarios) — inputs, stderr, and fixes taken verbatim from the rule test files of nvbn/thefuck (MIT), spanning git typos, missing sudo, cd errors, package managers, and more.
Scenarios were deduped across sources; entries with fabricated-looking or
machine-state-dependent fixes were dropped; alternate corrections were added
only where genuinely equivalent. Full cleaning log in PROVENANCE.md.
Scoring
Two modes matter:
- bare input — the model sees only the typed command. Fair for typo-class
scenarios (most of
thefuck). - with stderr — the error text is appended to the input. Required for
repair-class scenarios (most of
nofaq), whose fixes depend on the error (cd files→mkdir files; cd filesonly given "no such file or directory").
Report both, per source. Exact match against any entry in expected
(whitespace-normalized) is the metric; it is conservative — functionally
equivalent alternative fixes count as misses unless listed.
Runner: training/bench.py
in the fash repo.
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