RosettaCodeData/Task/Execute-a-system-command/Amazing-Hopper/execute-a-system-command.ho...

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#!/usr/bin/hopper
#include <hopper.h>
main:
/* execute "ls -lstar" with no result return (only displayed) */
{"ls -lstar"},execv
/* this form does not allow composition of the line with variables.
Save result in the variable "s", and then display it */
s=`ls -l | awk '{if($2=="2")print $0;}'`
{"\n",s,"\n"}print
data="2"
{""}tok sep
// the same as above, only I can compose the line:
{"ls -l | awk '{if($2==\"",data,"\")print $0;}'"}join(s),{s}exec,print
{"\n\n"}print
// this does the same as above, with an "execute" macro inside a "let" macro:
t=0,let (t := execute( {"ls -l | awk '{if($2==\""},{data},{"\")print $0;}'"} ))
{t,"\n"}print
{0}return