opam-search man page

opam-search ā€” An alias for list --search.


opam search [OPTION]... [PATTERNS]...


opam search is an alias for opam list --search.

See opam list --help for details.

Package Selection Options

-A, --all

Include all, even uninstalled or unavailable packages

-a, --available

List only packages that are available on the current system


List only the immutable base of the current switch (i.e. compiler packages)


Only list packages that are compatible with all of PACKAGES.


List packages that have declared conflicts with at least one of the given list. This includes conflicts defined from the packages in the list, from the other package, or by a common conflict-class: field.


List only packages that depend on one of (comma-separated) PACKAGES.


Include optional dependencies in dependency requests.


Include development packages in dependencies.


Filter packages with a match for PATTERN on the given FIELD


Only include packages which have the given flag set. Package flags are one of: light-uninstall verbose plugin compiler conf


Only includes packages which have the given tag set

-i, --installed

List installed packages only. This is the default when no further arguments are supplied


List only packages that can be installed on the current switch (this calls the solver and may be more costly; a package depending on an unavailable package may be available, but is never installable)


List what is available from the repositories, without consideration for the current (or any other) switch (installed or pinned packages, etc.)


Exclude build dependencies (they are included by default).


Instead of selecting packages that match all the criteria, select packages that match any of them


Finds installed packages responsible for installing the given file


List only the pinned packages


Include dependencies tagged as post.


With `--depends-on' and `--required-by', display all transitive dependencies rather than just direct dependencies.


Include only packages that took their origin from one of the given repositories (unless no-switch is also specified, this excludes pinned packages).


List only the dependencies of (comma-separated) PACKAGES.


Restrict to a solution to install (comma-separated) PACKAGES, i.e. a consistent set of packages including those. This is subtly different from `--required-by --recursive`, which is more predictable and can't fail, but lists all dependencies independently without ensuring consistency. Without `--installed`, the answer is self-contained and independent of the current installation. With `--installed', it's computed from the set of currently installed packages. `--no-switch` further makes the solution independent from the currently pinned packages, architecture, and compiler version. The combination with `--depopts' is not supported.

--roots, --installed-roots

List only packages that were explicitly installed, excluding the ones installed as dependencies

-t, --with-test, --test

Include test-only dependencies.

--with-doc, --doc

Include doc-only dependencies.

Output Format Options


Select the columns to display among: name, version, package, synopsis, synopsis-or-target, description, <field>:, installed-version, pin, source-hash, opam-file, all-installed-versions, available-versions, all-versions, repository, installed-files, vc-ref, depexts. The default is name when --short is present and name, installed-version, synopsis-or-target otherwise.

-e, --external, --depexts

Instead of displaying the packages, display their external dependencies that are associated with the current system. This excludes other display options. Rather than using this directly, you should probably head for the `depext' plugin, that will use your system package management system to handle the installation of the dependencies. Run `opam depext'.


Print the values of opam fields normalised

-S, --sort

Sort the packages in dependency order (i.e. an order in which they could be individually installed.)

-s, --short

Don't print a header, and sets the default columns to name only. If you need package versions included, use --columns=package instead

--separator=STRING (absent= )

Set the column-separator string

-V, --all-versions

Normally, when multiple versions of a package match, only one is shown in the output (the installed one, the pinned-to one, or, failing that, the highest one available or the highest one). This flag disables this behaviour and shows all matching versions. This also changes the default display format to include package versions instead of just package names (including when --short is set). This is automatically turned on when a single non-pattern package name is provided on the command-line.


Define the given variable bindings. Typically useful with --external to override the values for arch, os, os-distribution, os-version, os-family.


Wrap long lines, the default being to truncate when displaying on a terminal, or to keep as is otherwise



Package patterns with globs. Unless --search is specified, they match againsta NAME or NAME.VERSION


--help[=FMT] (default=auto)

Show this help in format FMT. The value FMT must be one of `auto', `pager', `groff' or `plain'. With `auto', the format is `pager` or `plain' whenever the TERM env var is `dumb' or undefined.


Show version information.

Common Options

These options are common to all commands.


Don't fail if all requested packages can't be installed: try to install as many as possible. Note that not all external solvers may support this option (recent versions of aspcud or mccs should).


Colorize the output. WHEN must be one of `always', `never' or `auto'.


Specify user preferences for dependency solving for this run. Overrides both $OPAMCRITERIA and $OPAMUPGRADECRITERIA. For details on the supported language, and the external solvers available, see http://opam.ocaml.org/doc/Specifying_Solver_Preferences.html. A general guide to using solver preferences can be found at http://www.dicosmo.org/Articles/usercriteria.pdf.


Debug option: Save the CUDF requests sent to the solver to FILENAME-<n>.cudf.


Print debug message to stderr. This is equivalent to setting $OPAMDEBUG to "true".


Like --debug, but allows specifying the debug level (--debug sets it to 1). Equivalent to setting $OPAMDEBUG to a positive integer.


Print the git version of opam, if set (i.e. you are using a development version), and exit.


Ignore extra pins required by packages that get pinned, either manually through opam pin or through opam install DIR. This is equivalent to setting IGNOREPINDEPENDS=true.


Save the results of the opam run in a computer-readable file. If the filename contains the character `%', it will be replaced by an index that doesn't overwrite an existing file. Similar to setting the $OPAMJSON variable.


When configuring or updating a repository that is written for an earlier opam version (1.2), opam internally converts it to the current format. This disables this behaviour. Note that repositories should define their format version in a 'repo' file at their root, or they will be assumed to be in the older format. It is, in any case, preferable to upgrade the repositories manually using opam admin upgrade [--mirror URL] when possible.


Opam will replace itself with a newer binary found at OPAMROOT/opam if present. This disables this behaviour.

-q, --quiet

Disables --verbose.


Use ROOT as the current root path. This is equivalent to setting $OPAMROOT to ROOT.

--safe, --readonly

Make sure nothing will be automatically updated or rewritten. Useful for calling from completion scripts, for example. Will fail whenever such an operation is needed ; also avoids waiting for locks, skips interactive questions and overrides the $OPAMDEBUG variable.


Specify the CUDF solver to use for resolving package installation problems. This is either a predefined solver (this version of opam supports builtin-mccs+lp(), builtin-mccs+glpk, aspcud, mccs, aspcud-old, packup), or a custom command that should contain the variables %{input}%, %{output}%, %{criteria}%, and optionally %{timeout}%.


Fail whenever an error is found in a package definition or a configuration file. The default is to continue silently if possible.


Use SWITCH as the current compiler switch. This is equivalent to setting $OPAMSWITCH to SWITCH.

--use-internal-solver, --no-aspcud

Disable any external solver, and use the built-in one (this requires that opam has been compiled with a built-in solver).

-v, --verbose

Be more verbose. One -v shows all package commands, repeat to also display commands called internally (e.g. tar, curl, patch etc.) Repeating n times is equivalent to setting $OPAMVERBOSE to "n".

-w, --working-dir

Whenever updating packages that are bound to a local, version-controlled directory, update to the current working state of their source instead of the last committed state, or the ref they are pointing to. This only affects packages explicitly listed on the command-line.

-y, --yes

Answer yes to all yes/no questions without prompting. This is equivalent to setting $OPAMYES to "true".

Environment Variables

Opam makes use of the environment variables listed here. Boolean variables should be set to "0", "no", "false" or the empty string to disable, "1", "yes" or "true" to enable.

OPAMCOLOR, when set to always or never, sets a default value for the --color option.

OPAMCRITERIA specifies user preferences for dependency solving. The default value depends on the solver version, use `config report` to know the current setting. See also option --criteria

OPAMCURL can be used to select a given 'curl' program. See OPAMFETCH for more options.

OPAMDEBUG see options `--debug' and `--debug-level'.

OPAMDOWNLOADJOBS sets the maximum number of simultaneous downloads.

OPAMERRLOGLEN sets the number of log lines printed when a sub-process fails. 0 to print all.

OPAMEXTERNALSOLVER see option `--solver'.

OPAMFETCH specifies how to download files: either `wget', `curl' or a custom command where variables %{url}%, %{out}%, %{retry}%, %{compress}% and %{checksum}% will be replaced. Overrides the 'download-command' value from the main config file.

OPAMJOBS sets the maximum number of parallel workers to run.

OPAMJSON log json output to the given file (use character `%' to index the files)

OPAMLOCK see option `--lock'.

OPAMNOAUTOUPGRADE disables automatic internal upgrade of repositories in an earlier format to the current one, on 'update' or 'init'.

OPAMKEEPLOGS tells opam to not remove some temporary command logs and some backups. This skips some finalisers and may also help to get more reliable backtraces

OPAMLOCKRETRIES sets the number of tries after which OPAM gives up acquiring its lock and fails. <= 0 means infinite wait.

OPAMNO answer no to any question asked.

OPAMNOASPCUD see option `--no-aspcud'.

OPAMNOSELFUPGRADE see option `--no-self-upgrade'.

OPAMPINKINDAUTO sets whether version control systems should be detected when pinning to a local path. Enabled by default since 1.3.0.

OPAMREQUIRECHECKSUMS Enables option `--require-checksums' when available (e.g. for `opam install`).

OPAMRETRY sets the number of tries before failing downloads.

OPAMROOT see option `--root'. This is automatically set by `opam env --root=DIR --set-root'.

OPAMROOTISOK don't complain when running as root.

OPAMSAFE see option `--safe'

OPAMSKIPVERSIONCHECKS bypasses some version checks. Unsafe, for compatibility testing only.

OPAMSOLVERTIMEOUT change the time allowance of the solver. Default is 60.0, set to 0 for unlimited. Note that all solvers may not support this option.

OPAMSTATUSLINE display a dynamic status line showing what's currently going on on the terminal. (one of one of `always', `never' or `auto')

OPAMSWITCH see option `--switch'. Automatically set by `opam env --switch=SWITCH --set-switch'.

OPAMUPGRADECRITERIA specifies user preferences for dependency solving when performing an upgrade. Overrides OPAMCRITERIA in upgrades if both are set. See also option --criteria

OPAMUSEINTERNALSOLVER see option `--use-internal-solver'.

OPAMUTF8 use UTF8 characters in output (one of one of `always', `never' or `auto'). By default `auto', which is determined from the locale).

OPAMUTF8MSGS use extended UTF8 characters (camels) in opam messages. Implies OPAMUTF8. This is set by default on OSX only.

OPAMVAR_var overrides the contents of the variable var when substituting `%{var}%` strings in `opam` files.

OPAMVAR_package_var overrides the contents of the variable package:var when substituting `%{package:var}%` strings in `opam` files.

OPAMVERBOSE see option `--verbose'.

OPAMYES see option `--yes'.

Exit Status

As an exception to the following, the `exec' command returns 127 if the command was not found or couldn't be executed, and the command's exit value otherwise.


Success, or true for boolean queries.


False. Returned when a boolean return value is expected, e.g. when running with --check, or for queries like opam lint.


Bad command-line arguments, or command-line arguments pointing to an invalid context (e.g. file not following the expected format).


Not found. You requested something (package, version, repository, etc.) that couldn't be found.


Aborted. The operation required confirmation, which wasn't given.


Could not acquire the locks required for the operation.


There is no solution to the user request. This can be caused by asking to install two incompatible packages, for example.


Error in package definition, or other metadata files. Using --strict raises this error more often.


Package script error. Some package operations were unsuccessful. This may be an error in the packages or an incompatibility with your system. This can be a partial error.


Sync error. Could not fetch some remotes from the network. This can be a partial error.


Configuration error. Opam or system configuration doesn't allow operation, and needs fixing.


Solver failure. The solver failed to return a sound answer. It can be due to a broken external solver, or an error in solver configuration.


Internal error. Something went wrong, likely due to a bug in opam itself.


User interrupt. SIGINT was received, generally due to the user pressing Ctrl-C.

Further Documentation

See https://opam.ocaml.org/doc.


Vincent Bernardoff <vb@luminar.eu.org>

Raja Boujbel <raja.boujbel@ocamlpro.com>

Roberto Di Cosmo <roberto@dicosmo.org>

Thomas Gazagnaire <thomas@gazagnaire.org>

Louis Gesbert <louis.gesbert@ocamlpro.com>

Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>

Anil Madhavapeddy <anil@recoil.org>

Guillem Rieu <guillem.rieu@ocamlpro.com>

Ralf Treinen <ralf.treinen@pps.jussieu.fr>

Frederic Tuong <tuong@users.gforge.inria.fr>


Check bug reports at https://github.com/ocaml/opam/issues.


Opam 2.0.0 Opam Manual