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.

Sr.No. Variable & Description
1

DLN_LIBRARY_PATH

Search path for dynamically loaded modules.

2

HOME

Directory moved to when no argument is passed to Dir::chdir. Also used by File::expand_path to expand "~".

3

LOGDIR

Directory moved to when no arguments are passed to Dir::chdir and environment variable HOME isn't set.

4

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).

5

RUBYLIB

Search path for libraries. Separate each path with a colon (semicolon in DOS and Windows).

6

RUBYLIB_PREFIX

Used to modify the RUBYLIB search path by replacing prefix of library path1 with path2 using the format path1;path2 or path1path2.

7

RUBYOPT

Command-line options passed to Ruby interpreter. Ignored in taint mode (Where $SAFE is greater than 0).

8

RUBYPATH

With -S option, search path for Ruby programs. Takes precedence over PATH. Ignored in taint mode (where $SAFE is greater than 0).

9

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 the 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_environment.htm

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