Shell script does not run: simple -

writing shell script switch between ruby versions because rvm setup requires me write 2-3 lines switch ruby versions, , im doing because im writing ruby app requires 2.2.1 , latex documents requires ruby 1.9.1. current code looks more pseudocode, please me run. here's code:

#!/bin/sh /bin/bash --login rvm list // external shell command echo -n use one? > read text rvm use $text // external shell command 

that script problematic since run bash login shell , refuse run of other lines until exit it.

you don't need shell script you're trying do, have 2 aliases set in profile:

alias rlist='rvm list' alias ruse='rvm use' 

then can enter rlist if want list of them, or ruse 2.2.1 (for example) select one.

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alternatively, walter a points out in comment, hard-code possibilities assuming don't want dynamic:

alias rbapp='rvm use 2.2.1' alias rbltx='rvm use 1.9.1' 

this has added advantage of allowing more things @ end if needed:

alias rbltx='rvm use 1.9.1; echo using latex ruby' 

something that's not possible aliases needing parameters.