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lang-bash
eval, but if you're using thezshshell, then there are better (safer) ways of doing that.evalusage on user input is probably no good idea, because it could lead to the user executing commands you have not intended.$(reboot)or${HOME+$(reboot)}, shouldls -la $web_application_rootreboot?${(e)web_application_root}would expand the variableweb_application_rootto$HOME/wwwand then apply a second re-evaluation to the result, expanding any further variable.