Fixes installer to not crash a version of bash
Fixes installer to not crash a version of bash

`bash -c '[[ -e /dev/fd/abcdefghijklmnopqrstuvwx ]]'` crashes certain versions of bash
e.g., `GNU bash, version 4.2.25(1)-release (x86_64-pc-linux-gnu)` on raiders.
This problem occurred when used with process substitution.

Gela/deepdive,sky-xu/deepdive,nvoron23/deepdive,vsoch/deepdive,shahin/deepdive,RTsWorld/deepdive,Atlas7/deepdive,RTsWorld/deepdive,infinitespace/deepdive,wgapl/deepdive,zifeishan/deepdive,kod3r/deepdive,closedLoop/deepdive,HazyResearch/deepdive,Gela/deepdive,kod3r/deepdive,wgapl/deepdive,RTsWorld/deepdive,zifeishan/deepdive,kod3r/deepdive,vsoch/deepdive,vasyvas/deepdive,topojoy/deepdive,wgapl/deepdive,nvoron23/deepdive,vasyvas/deepdive,vasyvas/deepdive,vsoch/deepdive,vsoch/deepdive,Gela/deepdive,Gela/deepdive,topojoy/deepdive,wgapl/deepdive,HazyResearch/deepdive,kod3r/deepdive,vsoch/deepdive,sai16vicky/deepdive,vasyvas/deepdive,maalmeida1837/deepdive,nvoron23/deepdive,topojoy/deepdive,sai16vicky/deepdive,AlexisBRENON/deepdive,vasyvas/deepdive,maalmeida1837/deepdive,Atlas7/deepdive,Gela/deepdive,nvoron23/deepdive,AlexisBRENON/deepdive,sky-xu/deepdive,closedLoop/deepdive,kod3r/deepdive,sai16vicky/deepdive,HazyResearch/deepdive,AlexisBRENON/deepdive,zifeishan/deepdive,sai16vicky/deepdive,topojoy/deepdive,Atlas7/deepdive,nvoron23/deepdive,zifeishan/deepdive,wgapl/deepdive,topojoy/deepdive,Atlas7/deepdive,closedLoop/deepdive,closedLoop/deepdive,HazyResearch/deepdive,Atlas7/deepdive,infinitespace/deepdive,closedLoop/deepdive,infinitespace/deepdive,shahin/deepdive,AlexisBRENON/deepdive,maalmeida1837/deepdive,infinitespace/deepdive,maalmeida1837/deepdive,sai16vicky/deepdive,infinitespace/deepdive,zifeishan/deepdive,AlexisBRENON/deepdive,RTsWorld/deepdive,RTsWorld/deepdive,maalmeida1837/deepdive,infinitespace/deepdive