Ruby basic environment variable settings and common interpreter commands, ruby interpreter

Ruby basic environment variable settings and common interpreter commands, ruby interpreter

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.

For Unix, run the env command to view the list of all environment variables.

HOSTNAME=ip-72-167-112-17.ip.secureserver.netRUBYPATH=/usr/binSHELL=/bin/bashTERM=xtermHISTSIZE=1000SSH_CLIENT=122.169.131.179 1742 22SSH_TTY=/dev/pts/1USER=amroodJRE_HOME=/usr/java/jdk/jreJ2RE_HOME=/usr/java/jdk/jrePATH=/usr/local/bin:/bin:/usr/bin:/home/guest/binMAIL=/var/spool/mail/guestPWD=/home/amroodINPUTRC=/etc/inputrcJAVA_HOME=/usr/java/jdkLANG=CHOME=/rootSHLVL=2JDK_HOME=/usr/java/jdkLOGDIR=/usr/log/rubyLOGNAME=amroodSSH_CONNECTION=122.169.131.179 1742 72.167.112.17 22LESSOPEN=|/usr/bin/lesspipe.sh %sRUBYLIB=/usr/lib/rubyG_BROKEN_FILENAMES=1_=/bin/env

Ruby command line options
Ruby is generally run from the command line as follows:

$ ruby [ options ] [.] [ programfile ] [ arguments ... ]

The interpreter can be called using the following options to control the interpreter's environment and behavior.

Single-character command line options can be used in combination. The following two lines share the same meaning:

$ ruby -ne 'print if /Ruby/' /usr/share/bin$ ruby -n -e 'print if /Ruby/' /usr/share/bin