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perlbrew - Perl environment manager.


perlbrew command syntax:

    perlbrew <command> [options] [arguments]


    init           Initialize perlbrew environment.

    install        Install perl
    uninstall      Uninstall the given installation
    available      List perls available to install
    lib            Manage local::lib directories.
    alias          Give perl installations a new name

    list           List perl installations
    use            Use the specified perl in current shell
    off            Turn off perlbrew in current shell
    switch         Permanently use the specified perl as default
    switch-off     Permanently turn off perlbrew (revert to system perl)

    self-upgrade       Upgrade perlbrew itself.
    install-cpanm      Install cpanm, a friendly companion.
    install-patchperl  Install patchperl

    mirror         Pick a preferred mirror site
    version        Display version
    help           Read more detailed instructions

Options for install command:

    -f --force     Force installation
    -j $n          Parallel buildng and testing. ex. C<perlbrew install -j 5 perl-5.14.2>
    -n --notest    Skip testing

       --as        Install the given version of perl by a name.
                   ex. C<perlbrew install perl-5.6.2 --as legacy-perl>

    -D,-U,-A       Switches passed to perl Configure script.
                   ex. C<perlbrew install perl-5.10.1 -D usemymalloc -U uselargefiles>

    --sitecustomize $filename
                   Specify a file to be installed as sitecustomize.pl

Generic command options:

    -q --quiet     Be quiet on informative output message.
    -v --verbose   Tell me more about it.

See `perlbrew help` for the full documentation of perlbrew, or

See `perlbrew help <command>` for detail description of the command.


It is the simpleist to use the perlbrew installer, just paste this statement to your terminal:

    curl -kL http://install.perlbrew.pl | bash

After that, perlbrew installs itself to ~/perl5/perlbrew/bin, and you should follow the instruction on screen to modify your shell rc file to put it in your PATH.

The installed perlbrew command is a standalone executable that can be run with system perl. The minimun system perl version requirement is 5.8.0, which should be good enough for most of the OSes these days.

A packed version of patchperl to ~/perl5/perlbrew/bin, which is required to build old perls.

The directory ~/perl5/perlbrew will contain all install perl executables, libraries, documentations, lib, site_libs. In the documentation, that directory is referred as "perlbrew root". If you need to set it to somewhere else because, say, your HOME has limited quota, you can do that by setting PERLBREW_ROOT environment variable before running the installer:

    export PERLBREW_ROOT=/opt/perl5
    curl -kL http://install.perlbrew.pl | bash

You may also install perlbrew from CPAN:

    cpan App::perlbrew

In this case, the perlbrew command is installed as /usr/bin/perlbrew or /usr/local/bin/perlbrew or others, depending on the location of your system perl installation.

Please make sure not to run this with one of the perls brewed with perlbrew. It's the best to turn perlbrew off before you run that, if you're upgrading.

    perlbrew off
    cpan App::perlbrew

You should always use system cpan (like /usr/bin/cpan) to install App::perlbrew because it will be installed under a system PATH like /usr/bin, which is not affected by perlbrew switch or use command.

The self-upgrade command will not upgrade the perlbrew installed by cpan command, but it is also easy to upgrade perlbrew by running `cpan App::perlbrew` again.



By default, perlbrew builds and installs perls into $ENV{HOME}/perl5/perlbrew directory. To use a different directory, set this environment variable in your bashrc to the directory in your shell RC before sourcing perlbrew's RC.

It is possible to share one perlbrew root with multilpe user account on the same machine. Therefore people do not have to install the same version of perl over an over. Let's say /opt/perl5 is the directory we want to share. All users should be able append this snippet to their bashrc to make it effective:

    export PERLBREW_ROOT=/opt/perl5
    source ${PERLBREW_ROOT}/etc/bashrc

After doing so, everone's PATH should include /opt/perl5/bin and /opt/perl5/perls/${PERLBREW_PERL}/bin. Each user can invoke perlbrew switch and perlbrew use to independently switch to different perl environment of their choice. However, only the user with write permission to $PERLBREW_ROOT may install CPAN modules. This is both good and bad depending on the working convention of your team.

If you wish to install CPAN modules only for yourself, you should use the lib command to construct a personal local::lib environment. local::lib environments are personal, and are not shared between different users. For more detail, read perlbrew help lib and the documentation of local::lib.

If you want even a cooler module isolation and wish to install CPAN modules used for just one project, you should use carton for this purpose.

It is also possible to set this variable before installing perlbrew to make perlbrew install itself under the given PERLBREW_ROOT:

    export PERLBREW_ROOT=/opt/perl5
    curl -kL http://install.perlbrew.pl | bash

After doing this, the perlbrew executable is installed as /opt/perl5/bin/perlbrew


By default, perlbrew stores per-user setting to $ENV{HOME}/.perlbrew directory. To use a different directory, set this environment variable in your shell RC before sourcing perlbrew's RC.

In some cases, say, your home directory is on NFS and shared across multiple machines, you may wish to have several different perlbrew setting per-machine. To do so, you can use the PERLBREW_HOME environment variable to tell perlbrew where to look for the initialization file. Here's a brief bash snippet for the given senario.

    if [ "$(hostname)" == "machine-a" ]; then
        export PERLBREW_HOME=~/.perlbrew-a
    elif [ "$(hostname)" == "machine-b" ]; then
        export PERLBREW_HOME=~/.perlbrew-b

    source ~/perl5/perlbrew/etc/bashrc


The init command should be manually invoked whenever you (the perlbrew user) upgrade perlbrew.

However, if the upgrade is done with self-upgrade command, or by running the one-line installer manually, this command is invoked automatically.


install [ perl-<version> | <version> ]

Build and install the given version of perl.

Version numbers usually look like "5.x.xx", or "perl-5.xx.x-RCx" for release candidates.

The specified perl is downloaded from the offical CPAN website or from the mirror site configured before.

To configure mirror site, invoke `mirror` command.

install [ perl-blead | blead ]

A special way to install the blead version of perl, which is downloaded from this specific URL regardless of mirror settings:

install /path/to/perl/git/checkout/dir

Build and install from the given git checkout dir.

install /path/to/perl-5.14.0.tar.gz

Build and install from the given archive file.

install http://example.com/mirror/perl-5.12.3.tar.gz

Build and install from the given URL. Supported URL schemes are http://, https://, ftp:// and file://.


Usage: perlbrew uninstall <name>

Uninstalls the given perl installation.


Usage: perlbrew use [perl-<version> | <version> | <name>]

Use the given version perl in current shell. This will not effect newly opened shells.

Without a parameter, shows the version of perl currently in use.


Usage: perlbrew switch [ <name> ]

Switch to the given version, and makes it the default for this and all future terminal sessions.

Without a parameter, shows the version of perl currently selected.


Usage: perlbrew list

List the installed versions of perl.


Usage: perlbrew available

List the recently available versions of perl on CPAN.

The list is retrieved from the web page http://www.cpan.org/src/README.html, and is not the list of *all* perl versions ever releasesed in the past.

NOTICE: This command might be gone in the future and becomes an option of 'list' command.


Usage: perlbrew off

Temporarily disable perlbrew in the current shell. Effectively re-enables the default system Perl, whatever that is.

This command works only if you add the statement of `source $PERLBREW_ROOT/etc/bashrc` in your shell initialization (bashrc / zshrc).


Usage: perlbrew switch-off

Permananently disable perlbrew. Use switch command to re-enable it. Invoke use command to enable it only in the current shell.

Re-enables the default system Perl, whatever that is.


Usage: perlbrew alias [-f] create <name> <alias>

    Create an alias for the installation named <name>.

Usage: perlbrew alias [-f] rename <old_alias> <new_alias>

    Rename the alias to a new name.

Usage: perlbrew alias delete <alias>

    Delete the given alias.


Usage: perlbrew mirror

Run this if you want to choose a specific CPAN mirror to install the perls from. It will display a list of mirrors for you to pick from. Hit 'q' to cancel the selection.


Usage: perlbrew exec <command> <args...>

Execute command for all perls, one by one.

For example, run a Hello program:

    perlbrew exec perl -e 'print "Hello from $]\n"'

The output depends on your perl installations, and looks like this:

    Hello word from perl-5.012002
    Hello word from perl-5.012003
    Hello word from perl-5.013010
    Hello word from perl-5.014000

Notice that the command is not executed in parallel.


Usage: perlbrew env <name>

Low-level command. Invoke this command to see the list of environment variables that are set by perlbrew itself for shell integration.

The output is something similar to this (if your shell is bash/zsh):

    export PERLBREW_ROOT=/Users/gugod/perl5/perlbrew
    export PERLBREW_VERSION=0.31
    export PERLBREW_PATH=/Users/gugod/perl5/perlbrew/bin:/Users/gugod/perl5/perlbrew/perls/current/bin
    export PERLBREW_PERL=perl-5.14.1

tcsh / csh users shall seens lines of 'setenv' statements instead of `export`.


Usage: perlbrew symlink-executables <name>

Low-level command. This command is used to create the perl executable symbolic link to, say, perl5.13.6. This is only required for development version of perls.

You don't need to do this unless you have been using old perlbrew to install perls, and you find youself confused because the perl that you just installed appears to be missing after invoking `use` or `switch`. perbrew changes its installation layout since version 0.11, which generades symlinks to executables in a better way.

If you just upgraded perlbrew (from 0.11 or earlier versions) and perlbrew switch failed to work after you switch to a development release of perl, say, perl-5.13.6, run this command:

    perlbrew symlink-executables perl-5.13.6

This essentially creates this symlink:

   -> ${PERLBREW_ROOT}/perls/perl-5.13.6/bin/perl5.13.6

Newly installed perls, whether they are development versions or not, does not need manually treatment with this command.


Usage: perlbrew install-cpanm

Install the cpanm standalone executable in $PERLBREW_ROOT/bin.

For more rationale about the existence of this command, read <http://www.perlbrew.pl/Perlbrew-and-Friends.html>


Usage: perlbrew install-patchperl

Install the patchperl standalone executable in $PERLBREW_ROOT/bin. This is automaticall invoked if your perlbrew installation is done with the installer, but not with cpan.

For more rationale about the existence of this command, read <http://www.perlbrew.pl/Perlbrew-and-Friends.html>


Usage: perlbrew self-upgrade

This command upgrades Perlbrew to its latest version.


Usage: perlbrew self-install

NOTICE: You should not need to run this command in your daily routine.

This command install perlbrew itself to $PERLBREW_ROOT/bin. It is intended used by the perlbrew installer. However, you may manually do the following to re-install only the perlbrew executable:

    curl -kL http://get.perlbrew.pl -o perlbrew
    perl ./perlbrew install

It is slightly different from running the perlbrew installer because patchperl is not installed in this case.


Usage: perlbrew version

Show the version of perlbrew.



    perlbrew lib create <lib-name>
    perlbrew lib delete <lib-name>

The `lib` command is used to manipulate local::lib roots inside perl installations. Effectively it is similar to `perl -Mlocal::lib=/path/to/lib-name`, but a little bit more than just that.

A lib name can be a short name, containing alphanumeric, like 'awesome', or a full name, prefixed by a perl installation name and a '@' sign, for example, 'perl-5.14.2@awesome'.

Here are some a brief examples to invoke the `lib` command:

    # Create libs by name
    perlbrew lib create nobita
    perlbrew lib create perl-5.12.3@shizuka

    perlbrew list     # See the list of use/switch targets.

    # Activate a lib in current shell.
    perlbrew use perl-5.12.3@nobita
    perlbrew use perl-5.14.2@nobita

    # Activate a lib as default.
    perlbrew switch perl-5.14.2@nobita

    # Delete the lib
    perlbrew lib delete nobita
    perlbrew lib delete perl-5.12.3@shizuka

Short lib names are local to current perl. A lib name 'nobita' can refer to 'perl-5.12.3@nobita' or 'perl-5.14.2@nobita', depending on your current perl.

When useing or switching to a lib, always provide the long name. A simple rule: the argument to use or siwtch command should appear in the output of perlbrew list.


If you plan to upgrade perlbrew from version 0.16 or order to a recent version, you should do these steps to adjust your perl installations:

    1. remove $PERLBREW_ROOT/perls/current if it exists
    2. remove symlinks under $PERLBREW_ROOT/perls/bin
    3. run C<perlbrew symlink-executables>
    4. run C<perlbrew init>
    5. run C<perlbrew switch $something> to set your default perl.

Or simply run these statements to do so (you might need to change the value of PERLBREW_ROOT):

    export PERLBREW_ROOT=${HOME}/perl5/perlbrew
    rm -f $PERLBREW_ROOT/perls/current
    rm -f `find $PERLBREW_ROOT/perls/bin -type l`
    perlbrew symlink-executables
    perlbrew init
    perlbrew switch perl-5.14.2 # or other ones.

Finally, you should add this line to the end of your ~/.bash_profile or ~/.zshenv file:

    source "$HOME/perl5/perlbrew/etc/bashrc"

Or if you have differnt PERLBREW_ROOT at, say, /opt/perl5, add:

    export PERLBREW_ROOT=/opt/perl5
    source "$PERLBREW_ROOT/etc/bashrc"

After doing that, you will be good to go.


App::perlbrew, App::cpanminus, Devel::PatchPerl