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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** | Search path for dynamically loaded modules. | | **HOME** | Directory to move to when no argument is passed to Dir::chdir. Also used by File::expand_path to expand "~". | | **LOGDIR** | Directory to move to when no argument is passed to Dir::chdir and the HOME environment variable is not set. | | **PATH** | Search path for executing child processes, and for Ruby programs when the -S option is specified. Paths are separated by colons (semicolons in DOS and Windows). | | **RUBYLIB** | Search path for libraries. Paths are separated by colons (semicolons in DOS and Windows). | | **RUBYLIB_PREFIX** | Used to modify the RUBYLIB search path by replacing the prefix path1 with path2 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** | Search path for Ruby programs when the -S option is specified. Takes precedence over PATH. Ignored in taint mode (where $SAFE is greater than 0). | | **RUBYSHELL** | Specifies the shell to use when executing commands. If this environment variable is not set, SHELL or COMSPEC is used. | For Unix, use the **env** command to view 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