Ruby Environment Variables

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

VariableDescription
DLN_LIBRARY_PATH Search path for dynamically loaded modules.
HOME Directory moved to when no argument is passed to Dir::chdir. Also used by File::expand_path to expand "~".
LOGDIR Directory moved to when no arguments are passed to Dir::chdir and environment variable HOME isn't set.
PATH Search path for executing subprocesses and searching for Ruby programs with the -S option. Separate each path with a colon (semicolon in DOS and Windows).
RUBYLIBSearch path for libraries. Separate each path with a colon (semicolon in DOS and Windows).
RUBYLIB_PREFIXUsed to modify the RUBYLIB search path by replacing prefix of library path1 with path2 using the format path1;path2 or path1path2.
RUBYOPT Command-line options passed to Ruby interpreter. Ignored in taint mode (Where $SAFE is greater than 0).
RUBYPATHWith -S option, search path for Ruby programs. Takes precedence over PATH. Ignored in taint mode (where $SAFE is greater than 0).
RUBYSHELL Specifies shell for spawned processes. If not set, SHELL or COMSPEC are checked.

For Unix, use 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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