unix: Properly recognize and report when script on cmdline not found.
unix: Properly recognize and report when script on cmdline not found.

Previosuly just silently exited.

alex-robbins/micropython,adafruit/circuitpython,ericsnowcurrently/micropython,blmorris/micropython,hiway/micropython,swegener/micropython,infinnovation/micropython,adafruit/circuitpython,orionrobots/micropython,ahotam/micropython,warner83/micropython,torwag/micropython,orionrobots/micropython,ganshun666/micropython,adafruit/circuitpython,omtinez/micropython,ganshun666/micropython,turbinenreiter/micropython,Vogtinator/micropython,micropython/micropython-esp32,galenhz/micropython,mianos/micropython,SHA2017-badge/micropython-esp32,neilh10/micropython,utopiaprince/micropython,dinau/micropython,oopy/micropython,neilh10/micropython,ChuckM/micropython,trezor/micropython,feilongfl/micropython,puuu/micropython,galenhz/micropython,toolmacher/micropython,puuu/micropython,MrSurly/micropython-esp32,MrSurly/micropython-esp32,utopiaprince/micropython,stonegithubs/micropython,puuu/micropython,vriera/micropython,jlillest/micropython,lbattraw/micropython,aethaniel/micropython,trezor/micropython,cwyark/micropython,blazewicz/micropython,Peetz0r/micropython-esp32,EcmaXp/micropython,henriknelson/micropython,adafruit/micropython,skybird6672/micropython,rubencabrera/micropython,dhylands/micropython,hiway/micropython,redbear/micropython,AriZuu/micropython,henriknelson/micropython,dhylands/micropython,matthewelse/micropython,chrisdearman/micropython,kerneltask/micropython,puuu/micropython,feilongfl/micropython,misterdanb/micropython,toolmacher/micropython,misterdanb/micropython,ceramos/micropython,omtinez/micropython,TDAbboud/micropython,PappaPeppar/micropython,galenhz/micropython,deshipu/micropython,danicampora/micropython,stonegithubs/micropython,bvernoux/micropython,tralamazza/micropython,ryannathans/micropython,ahotam/micropython,warner83/micropython,supergis/micropython,HenrikSolver/micropython,drrk/micropython,dmazzella/micropython,chrisdearman/micropython,blmorris/micropython,martinribelotta/micropython,Timmenem/micropython,micropython/micropython-esp32,tuc-osg/micropython,orionrobots/micropython,Timmenem/micropython,pfalcon/micropython,ganshun666/micropython,MrSurly/micropython-esp32,jlillest/micropython,dhylands/micropython,selste/micropython,toolmacher/micropython,mpalomer/micropython,kerneltask/micropython,noahwilliamsson/micropython,tralamazza/micropython,alex-robbins/micropython,dxxb/micropython,kerneltask/micropython,vriera/micropython,AriZuu/micropython,deshipu/micropython,KISSMonX/micropython,danicampora/micropython,ryannathans/micropython,vitiral/micropython,praemdonck/micropython,tdautc19841202/micropython,chrisdearman/micropython,bvernoux/micropython,utopiaprince/micropython,cloudformdesign/micropython,cwyark/micropython,adamkh/micropython,supergis/micropython,micropython/micropython-esp32,blmorris/micropython,selste/micropython,aitjcize/micropython,supergis/micropython,noahchense/micropython,jimkmc/micropython,ryannathans/micropython,Vogtinator/micropython,firstval/micropython,dmazzella/micropython,aitjcize/micropython,trezor/micropython,ernesto-g/micropython,matthewelse/micropython,paul-xxx/micropython,ernesto-g/micropython,lowRISC/micropython,dinau/micropython,noahwilliamsson/micropython,neilh10/micropython,hiway/micropython,selste/micropython,adamkh/micropython,jlillest/micropython,trezor/micropython,ericsnowcurrently/micropython,MrSurly/micropython-esp32,swegener/micropython,SungEun-Steve-Kim/test-mp,chrisdearman/micropython,jimkmc/micropython,xuxiaoxin/micropython,cnoviello/micropython,swegener/micropython,SungEun-Steve-Kim/test-mp,KISSMonX/micropython,noahwilliamsson/micropython,swegener/micropython,xyb/micropython,ChuckM/micropython,xhat/micropython,mgyenik/micropython,redbear/micropython,ruffy91/micropython,methoxid/micropystat,jimkmc/micropython,adafruit/micropython,SHA2017-badge/micropython-esp32,firstval/micropython,methoxid/micropystat,jmarcelino/pycom-micropython,adafruit/micropython,TDAbboud/micropython,puuu/micropython,praemdonck/micropython,rubencabrera/micropython,dxxb/micropython,suda/micropython,turbinenreiter/micropython,pramasoul/micropython,HenrikSolver/micropython,tralamazza/micropython,PappaPeppar/micropython,suda/micropython,ernesto-g/micropython,aethaniel/micropython,lbattraw/micropython,Vogtinator/micropython,jmarcelino/pycom-micropython,vitiral/micropython,blazewicz/micropython,drrk/micropython,alex-march/micropython,torwag/micropython,alex-march/micropython,tralamazza/micropython,dxxb/micropython,supergis/micropython,rubencabrera/micropython,heisewangluo/micropython,ahotam/micropython,matthewelse/micropython,vriera/micropython,tdautc19841202/micropython,ryannathans/micropython,ernesto-g/micropython,slzatz/micropython,mianos/micropython,ahotam/micropython,alex-robbins/micropython,lowRISC/micropython,lbattraw/micropython,tdautc19841202/micropython,mhoffma/micropython,praemdonck/micropython,ruffy91/micropython,ahotam/micropython,kostyll/micropython,dinau/micropython,vriera/micropython,slzatz/micropython,kostyll/micropython,kerneltask/micropython,orionrobots/micropython,aethaniel/micropython,MrSurly/micropython-esp32,dmazzella/micropython,aethaniel/micropython,tdautc19841202/micropython,redbear/micropython,kostyll/micropython,martinribelotta/micropython,ruffy91/micropython,Peetz0r/micropython-esp32,xhat/micropython,adamkh/micropython,alex-march/micropython,drrk/micropython,warner83/micropython,skybird6672/micropython,feilongfl/micropython,rubencabrera/micropython,suda/micropython,pfalcon/micropython,tdautc19841202/micropython,cloudformdesign/micropython,oopy/micropython,ChuckM/micropython,pozetroninc/micropython,AriZuu/micropython,Vogtinator/micropython,deshipu/micropython,tobbad/micropython,Peetz0r/micropython-esp32,hosaka/micropython,tobbad/micropython,cnoviello/micropython,alex-march/micropython,PappaPeppar/micropython,martinribelotta/micropython,TDAbboud/micropython,AriZuu/micropython,adamkh/micropython,alex-march/micropython,mpalomer/micropython,aitjcize/micropython,toolmacher/micropython,neilh10/micropython,TDAbboud/micropython,firstval/micropython,xyb/micropython,matthewelse/micropython,lowRISC/micropython,EcmaXp/micropython,dmazzella/micropython,HenrikSolver/micropython,praemdonck/micropython,cnoviello/micropython,blmorris/micropython,jmarcelino/pycom-micropython,drrk/micropython,tuc-osg/micropython,pfalcon/micropython,noahwilliamsson/micropython,jimkmc/micropython,adafruit/micropython,noahchense/micropython,MrSurly/micropython,redbear/micropython,aitjcize/micropython,noahchense/micropython,noahchense/micropython,torwag/micropython,HenrikSolver/micropython,infinnovation/micropython,PappaPeppar/micropython,mhoffma/micropython,emfcamp/micropython,cwyark/micropython,dinau/micropython,misterdanb/micropython,paul-xxx/micropython,chrisdearman/micropython,ceramos/micropython,hosaka/micropython,Timmenem/micropython,drrk/micropython,pozetroninc/micropython,pramasoul/micropython,danicampora/micropython,blazewicz/micropython,SHA2017-badge/micropython-esp32,ericsnowcurrently/micropython,praemdonck/micropython,vriera/micropython,Timmenem/micropython,blmorris/micropython,pozetroninc/micropython,ganshun666/micropython,mgyenik/micropython,KISSMonX/micropython,mhoffma/micropython,MrSurly/micropython,orionrobots/micropython,EcmaXp/micropython,cloudformdesign/micropython,supergis/micropython,ceramos/micropython,micropython/micropython-esp32,torwag/micropython,turbinenreiter/micropython,noahchense/micropython,xhat/micropython,jmarcelino/pycom-micropython,emfcamp/micropython,lowRISC/micropython,henriknelson/micropython,jlillest/micropython,vitiral/micropython,feilongfl/micropython,warner83/micropython,adafruit/circuitpython,micropython/micropython-esp32,methoxid/micropystat,pfalcon/micropython,kostyll/micropython,vitiral/micropython,lowRISC/micropython,deshipu/micropython,infinnovation/micropython,dhylands/micropython,xuxiaoxin/micropython,mpalomer/micropython,redbear/micropython,bvernoux/micropython,HenrikSolver/micropython,Peetz0r/micropython-esp32,skybird6672/micropython,hiway/micropython,emfcamp/micropython,pramasoul/micropython,adafruit/circuitpython,SHA2017-badge/micropython-esp32,paul-xxx/micropython,mpalomer/micropython,ChuckM/micropython,kostyll/micropython,dxxb/micropython,tuc-osg/micropython,slzatz/micropython,deshipu/micropython,utopiaprince/micropython,tobbad/micropython,mgyenik/micropython,methoxid/micropystat,utopiaprince/micropython,xyb/micropython,infinnovation/micropython,Peetz0r/micropython-esp32,feilongfl/micropython,jlillest/micropython,ceramos/micropython,neilh10/micropython,oopy/micropython,SungEun-Steve-Kim/test-mp,hosaka/micropython,omtinez/micropython,MrSurly/micropython,hiway/micropython,rubencabrera/micropython,noahwilliamsson/micropython,KISSMonX/micropython,ernesto-g/micropython,PappaPeppar/micropython,Vogtinator/micropython,ceramos/micropython,xuxiaoxin/micropython,infinnovation/micropython,mpalomer/micropython,skybird6672/micropython,ruffy91/micropython,kerneltask/micropython,bvernoux/micropython,martinribelotta/micropython,xuxiaoxin/micropython,AriZuu/micropython,martinribelotta/micropython,cwyark/micropython,Timmenem/micropython,trezor/micropython,suda/micropython,ericsnowcurrently/micropython,warner83/micropython,jimkmc/micropython,cloudformdesign/micropython,turbinenreiter/micropython,danicampora/micropython,danicampora/micropython,dinau/micropython,mianos/micropython,vitiral/micropython,oopy/micropython,blazewicz/micropython,mhoffma/micropython,paul-xxx/micropython,cwyark/micropython,mgyenik/micropython,swegener/micropython,xhat/micropython,ericsnowcurrently/micropython,mianos/micropython,pramasoul/micropython,mgyenik/micropython,mianos/micropython,alex-robbins/micropython,cnoviello/micropython,suda/micropython,alex-robbins/micropython,stonegithubs/micropython,xyb/micropython,jmarcelino/pycom-micropython,adafruit/circuitpython,stonegithubs/micropython,henriknelson/micropython,ChuckM/micropython,aethaniel/micropython,SHA2017-badge/micropython-esp32,oopy/micropython,cnoviello/micropython,firstval/micropython,lbattraw/micropython,emfcamp/micropython,TDAbboud/micropython,matthewelse/micropython,ryannathans/micropython,misterdanb/micropython,matthewelse/micropython,misterdanb/micropython,turbinenreiter/micropython,hosaka/micropython,selste/micropython,heisewangluo/micropython,blazewicz/micropython,mhoffma/micropython,tuc-osg/micropython,dhylands/micropython,lbattraw/micropython,skybird6672/micropython,EcmaXp/micropython,stonegithubs/micropython,dxxb/micropython,methoxid/micropystat,pozetroninc/micropython,slzatz/micropython,tuc-osg/micropython,tobbad/micropython,galenhz/micropython,pramasoul/micropython,xhat/micropython,emfcamp/micropython,SungEun-Steve-Kim/test-mp,adamkh/micropython,xuxiaoxin/micropython,slzatz/micropython,paul-xxx/micropython,SungEun-Steve-Kim/test-mp,heisewangluo/micropython,xyb/micropython,EcmaXp/micropython,heisewangluo/micropython,firstval/micropython,henriknelson/micropython,ruffy91/micropython,MrSurly/micropython,MrSurly/micropython,KISSMonX/micropython,bvernoux/micropython,selste/micropython,omtinez/micropython,pozetroninc/micropython,heisewangluo/micropython,adafruit/micropython,hosaka/micropython,torwag/micropython,galenhz/micropython,omtinez/micropython,toolmacher/micropython,pfalcon/micropython,cloudformdesign/micropython,ganshun666/micropython,tobbad/micropython