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rbexec 1 "Aug 2018" rbexec "User Manuals"

NAME

rbexec - execute commands against different Ruby interpreters

SYNOPSIS

rbexec ruby-identifier [command ...]

DESCRIPTION

rbexec is a shell script that configures the environment to use a particular Ruby interpreter. It works with a number of shells, including bash and zsh.

Unlike some similar tools (e.g., the excellent chruby ), rbexec does not modify the current shell environment. Instead, it starts an entirely new process -- so your previous environment is just an exit away.

EXAMPLES

Using the full path to a Ruby interpreter:

$ rbexec ~/.rvm/rubies/ruby-2.5.0/bin/ruby bash

Using an executable matching bin/ruby* under the provided directory:

$ source rbexec ; rbexec /opt/rubies/ruby-2.4.2

Using the last-matching entry in RBEXEC_RUBIES:

$ export RBEXEC_RUBIES=/my/custom/ruby-2.3.5:/my/custom/ruby-2.5.0
$ rbexec 2.3 which ruby
/my/custom/ruby-2.3.5/bin/ruby
$ rbexec 2 which ruby
/my/custom/ruby-2.5.0/bin/ruby

ENVIRONMENT VARIABLES

RBEXEC_RUBIES /a/ruby/path:/another/ruby/path/bin/ruby A colon-separated list of directories containing Ruby interpreters (paths matching .../bin/ruby*), or full paths to Ruby interpreters, or a combination thereof. Please not that rbexec does not handle paths with embedded colons, escaped or otherwise.

RBEXEC_AUTO_ADD_RUBIES 1|0 When set to 1, any subdirectories of /opt/rubies, ~/.rbfu/rubies, ~/.rbenv/versions, ~/.rvm/rubies, and ~/.rubies that contain executable files matching bin/ruby* will be treated as if they appeared in RBEXEC_RUBIES. This variable is set to 1 by default.

RBEXEC_EXEC 1|0 When set to 1, rbexec will start the specified command (or, if none was given, RBEXEC_SHELL) with the shell builtin exec. The default value of RBEXEC_EXEC is 0 if RBEXEC_SOURCED is set to 1 or if the variable $- contains the letter i, and 0 otherwise.

RBEXEC_PIPE_DOWN 1|0 rbexec probes whether the specified Ruby really is a Ruby interpreter by asking it to execute a Ruby one-liner via ruby -e 'command'. rbexec attempts to wrap this test in a timeout using, in order of preference, timeout, ruby, perl, python, or python2. If none of these programs appear in your PATH, rbexec issues a warning that the test Ruby command may hang indefinitely. Set RBEXEC_PIPE_DOWN=1 to disable this warning.

RBEXEC_SHELL /path/to/my/sh This is the program that rbexec executes when not given one explicitly on the command line. If RBEXEC_SHELL is unset or empty, rbexec uses various heuristics to infer the current shell, falling back to /bin/sh if none of the heuristics yields a match.

RBEXEC_SOURCED 1|0 Set this to indicate that rbexec has been sourced rather than run as an executable. As with RBEXEC_SHELL, if RBEXEC_SOURCED is not explicitly defined, rbexec uses a number of heurstics to determine whether it was sourced. These heuristics are far from perfect, so you may have to define RBEXEC_SOURCED yourself if rbexec gets it wrong.

RBEXEC_TIMEOUT N Set this to the number of seconds rbexec should wait for the test Ruby command described under RBEXEC_PIPE_DOWN to exit. Defaults to 5.

AUTHOR

Matt Schreiber tomeon@dogea.red

SEE ALSO

Shells supported by rbexec:

  • sh
  • ash
  • bash
  • dash
  • ksh
  • mksh
  • pdksh
  • zsh

Tools occupying a similar niche: