- Ruby Basics
- Ruby - Home
- Ruby - Overview
- Ruby - Environment Setup
- Ruby - Syntax
- Ruby - Classes and Objects
- Ruby - Variables
- Ruby - Operators
- Ruby - Comments
- Ruby - IF...ELSE
- Ruby - Loops
- Ruby - Methods
- Ruby - Blocks
- Ruby - Modules
- Ruby - Strings
- Ruby - Arrays
- Ruby - Hashes
- Ruby - Date & Time
- Ruby - Ranges
- Ruby - Iterators
- Ruby - File I/O
- Ruby - Exceptions
- Ruby Advanced
- Ruby - Object Oriented
- Ruby - Regular Expressions
- Ruby - Database Access
- Ruby - Web Applications
- Ruby - Sending Email
- Ruby - Socket Programming
- Ruby - Ruby/XML, XSLT
- Ruby - Web Services
- Ruby - Tk Guide
- Ruby - Ruby/LDAP Tutorial
- Ruby - Multithreading
- Ruby - Built-in Functions
- Ruby - Predefined Variables
- Ruby - Predefined Constants
- Ruby - Associated Tools
- Ruby Useful Resources
- Ruby - Quick Guide
- Ruby - Useful Resources
- Ruby - Discussion
- Ruby - Ruby on Rails Tutorial
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Ruby - Environment Variables
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