Provided by: opam-docs_1.2.2-4_all 
NAME
opam-update - Update the list of available packages.
SYNOPSIS
opam update [OPTION]... [NAMES]...
DESCRIPTION
This command updates each repository that has been previously set up by the opam init or
opam repository commands. The list of packages that can be upgraded will be printed out,
and the user can use opam upgrade to upgrade them.
ARGUMENTS
NAMES
List of repository or development package names.
OPTIONS
-j JOBS, --jobs=JOBS
Set the maximal number of concurrent jobs to use. You can also set it using the
$OPAMJOBS environment variable.
--json=FILENAME
Save the result output of an OPAM run in a computer-readable file
-R, --repositories
Only update repositories, not development packages.
--sync-archives
Always sync the remote archives files. This is not a good idea to enable this, unless
your really know what your are doing: this flag will make OPAM try to download the
archive files for ALL the available packages.
-u, --upgrade
Automatically run opam upgrade after the update.
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.