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Ruby Environment Variables

The Ruby interpreter uses the following environment variables to control its behavior. The ENV object contains a list of all currently set environment variables.

VariableDescription
DLN_LIBRARY_PATH The path to dynamically load the module search.
HOME The directory to move to when no arguments are passed to Dir::chdir. Also used for File::expand_path to extend "~".
LOGDIR The directory to move to when no parameters are passed to Dir::chdir and the environment variable HOME is not set.
PATH The search path for the child process and the search path for the Ruby program after the -S option is specified. Each path is separated by a colon (separated by a semicolon in DOS and Windows).
RUBYLIB The search path for the library. Each path is separated by a colon (separated by a semicolon in DOS and Windows).
RUBYLIB_PREFIX Used to modify the RUBYLIB search path by replacing the library's prefix path1 with path2 by using the format path1;path2 or path1path2.
RUBYOPT Command line options passed to the Ruby interpreter. Ignored in taint mode (where $SAFE is greater than 0).
RUBYPATH The search path for Ruby programs after the -S option is specified. Priority is higher than PATH. Ignored in taint mode (where $SAFE is greater than 0).
RUBYSHELL Specifies the shell to use when executing the command. If this environment variable is not set, use SHELL or COMSPEC.

For Unix, use the env command to see a list of all environment variables.

HOSTNAME=ip-72-167-112-17.ip.secureserver.net
RUBYPATH=/usr/bin
SHELL=/bin/bash
TERM=xterm
HISTSIZE=1000
SSH_CLIENT=122.169.131.179 1742 22
SSH_TTY=/dev/pts/1
USER=amrood
JRE_HOME=/usr/java/jdk/jre
J2RE_HOME=/usr/java/jdk/jre
PATH=/usr/local/bin:/bin:/usr/bin:/home/guest/bin
MAIL=/var/spool/mail/guest
PWD=/home/amrood
INPUTRC=/etc/inputrc
JAVA_HOME=/usr/java/jdk
LANG=C
HOME=/root
SHLVL=2
JDK_HOME=/usr/java/jdk
LOGDIR=/usr/log/ruby
LOGNAME=amrood
SSH_CONNECTION=122.169.131.179 1742 72.167.112.17 22
LESSOPEN=|/usr/bin/lesspipe.sh %s
RUBYLIB=/usr/lib/ruby
G_BROKEN_FILENAMES=1
_=/bin/env





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