OPAM-SHOW(1)

NAME

opam-show - Display information about specific packages.

SYNOPSIS

opam show [OPTION]... PACKAGES...

DESCRIPTION

This command displays the information block for the selected package(s).

The information block consists of the name of the package, the installed version if this package is installed in the currently selected compiler, the list of available (installable) versions, and a complete description.

opam list can be used to display the list of available packages as well as a short description for each.

ARGUMENTS

PACKAGES
    List of package names, with an optional version or constraint, e.g `pkg', `pkg.1.0' or `pkg>=0.5'.

OPTIONS

-f FIELDS, --field=FIELDS
    Only display these fields. You can specify multiple fields by separating them with commas.

--raw
    Print the raw opam file for this package

--where
    Print the location of the opam file used for this package

COMMON OPTIONS

These options are common to all commands.

--color=WHEN (absent=auto)
    Colorize the output. WHEN must be one of `always', `never' or `auto'.

--criteria=CRITERIA
    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. The default value is -count(down),-count(removed),-notuptodate(solution),-sum(solution,version-lag),-count(new) for upgrades, and -count(removed),-notuptodate(request),-sum(request,version-lag),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution),-sum(solution,version-lag) otherwise.

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

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

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

--git-version
    Print the git version if it exists and exit.

--help[=FMT] (default=pager)
    Show this help in format FMT (pager, plain or groff).

--no-base-packages
    Do not install base packages (useful for testing purposes). This is equivalent to setting $OPAMNOBASEPACKAGES to a non-empty string.

--no-self-upgrade
    OPAM will replace itself with a newer binary found at OPAMROOT/opam if present. This disables this behaviour.

-q, --quiet
    Be quiet when installing a new compiler.

--root=ROOT (absent=~/.opam)
    Use ROOT as the current root path. This is equivalent to setting $OPAMROOT to ROOT.

--safe
    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.

--solver=CMD
    Specify the name of the external dependency solver. The default value is aspcud. Either 'aspcud', 'packup' or a custom command that may contain the variables %{input}%, %{output}% and %{criteria}%

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

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

--use-internal-solver, --no-aspcud
    Force use of internal heuristics, even if an external solver is available.

-v, --verbose
    Be more verbose, show package sub-commands and their output. Repeat to see more. Repeating n times is equivalent to setting $OPAMVERBOSE to "n".

--version
    Show version information.

-y, --yes
    Disable interactive mode and answer yes to all questions that would otherwise be asked to the user. 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" of "false" 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 is -count(removed),-notuptodate(request),-sum(request,version-lag),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution),-sum(solution,version-lag). 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.

OPAMEXTERNALSOLVER see option `--solver'.

OPAMFETCH specifies how to download files: either `wget', `curl' or a custom command where variables %{url}%, %{out}%, %{retries}%, %{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.

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 if set, version control systems are detected when pinning to a local path.

OPAMREQUIRECHECKSUMS see option `--require-checksums'.

OPAMRETRY sets the number of tries before failing downloads.

OPAMROOT see option `--root'. This is automatically set by `opam config env --root=DIR' when DIR is non-default or OPAMROOT is already defined.

OPAMSAFE see option `--safe'

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

OPAMSOLVERTIMEOUT change the time allowance of the internal solver.

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 config env --switch=SWITCH'.

OPAMUPGRADECRITERIA specifies user preferences for dependency solving when performing an upgrade. Overrides OPAMCRITERIA in upgrades if both are set.The default value is -count(down),-count(removed),-notuptodate(solution),-sum(solution,version-lag),-count(new). 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'.

FURTHER DOCUMENTATION

See https://opam.ocaml.org.

AUTHORS

Thomas Gazagnaire <thomas@gazagnaire.org>

Anil Madhavapeddy <anil@recoil.org>

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

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

Louis Gesbert <louis.gesbert@ocamlpro.com>

Vincent Bernardoff <vb@luminar.eu.org>

Guillem Rieu <guillem.rieu@ocamlpro.com>

Roberto Di Cosmo <roberto@dicosmo.org>

BUGS

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