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johnallen3d/irb-process-substitution-error.md

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irb-process-substitution-error.md

Process Substitution Error in IRB

simple example of process substitution in shell (bash)

> echo <(true)
/dev/fd/11

now with Ruby (IRB) - note: Ruby is shelling out to /bin/sh not /bin/bash

> `echo <(true)`
sh: -c: line 0: syntax error near unexpected token `('

try using bash inside a Ruby sub shell

> `/bin/bash -c "echo <(true)"`
=> "/dev/fd/63\n"
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