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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.

Variable	Description
DLN_LIBRARY_PATH	The path for dynamically loading modules.
HOME	The directory to move to when no parameters are passed to Dir::chdir. It is also used by File::expand_path to expand "~".
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 executing subprocesses, as well as the path to move to when specifying -The S option after Ruby program's search path. Each path is separated by a colon (in DOS and Windows, it is separated by a semicolon).
RUBYLIB	The library search path. Each path is separated by a colon (in DOS and Windows, it is separated by a semicolon).
RUBYLIB_PREFIX	Used to modify the RUBYLIB search path, using the format path1;path2 or path1path2, prefix the library path with path1 Replace with path2.
RUBYOPT	Command-line options passed to the Ruby interpreter. It is ignored in taint mode (where $SAFE is greater than 0).
RUBYPATH	Specify -The S option after Ruby program's search path. Has a higher priority than PATH. It is ignored in taint mode (where $SAFE is greater than 0).
RUBYSHELL	to specify the shell to be used when executing a command. If this environment variable is not set, SHELL or COMSPEC will be used.

For Unix, use env Use the command to view the 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

Ruby Syntax Ruby Command Line Options