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reading and setting environment variables from and for shell commands
Special Variables and Pseudo-Variables example from a Well House Consultants training course
More on Special Variables and Pseudo-Variables [link]
Source code: envx Module: R110
# reading and setting environment variables from and for shell commands # I have used %q %Q and %x to make the quote types I am using very clear indeed ENV["report"] = %Q!A demo! ENV.each do |name, value| puts %Q{Called #{name} is #{value}} end action = %q!echo $report! puts action got = %x!#{action}! puts got.swapcase __END__ Sample output: WomanWithCat:4c grahamellis$ ruby envx Called TERM_PROGRAM is Apple_Terminal Called SHELL is /bin/bash Called TERM is xterm-256color Called TMPDIR is /var/folders/8_/vhvjgq2x0gv89g9fdlr8r6vc0000gn/T/ Called Apple_PubSub_Socket_Render is /tmp/launch-PSFHTg/Render Called TERM_PROGRAM_VERSION is 326 Called OLDPWD is /Users/grahamellis/may16/sa Called TERM_SESSION_ID is 60C5590C-3EC5-4680-8D33-F44AF1EF5821 Called USER is grahamellis Called SSH_AUTH_SOCK is /tmp/launch-ioerGn/Listeners Called __CF_USER_TEXT_ENCODING is 0x1F5:0:0 Called PATH is /Library/Frameworks/Python.framework/Versions/3.4/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin Called __CHECKFIX1436934 is 1 Called PWD is /Users/grahamellis/may16/sa/4c Called LANG is en_GB.UTF-8 Called SHLVL is 1 Called HOME is /Users/grahamellis Called LOGNAME is grahamellis Called _ is /usr/bin/ruby Called report is A demo echo $report a DEMO WomanWithCat:4c grahamellis$ Learn about this subject
This module and example are covered on the following public courses:
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