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perl -MAstro::Montenbruck::Time=jdnow,jd2mjd,jd_cent -e '$|++;print sp
+rintf("%-22s","Julian day").sprintf("%-22s","Modified Julian day").sp
+rintf("%-22s","Julian centuries since J2000.0")."\n";while(){$j=jdnow
+();print"\r".sprintf("%-22s",$j).sprintf("%-22s",jd2mjd($j)).sprintf(
+"%-22s",jd_cent($j));sleep 1}'

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```
#!/usr/bin/perl

...

  sleep 1
}
```