I mean, ignore files. Run an `at` session at the command line with no automation and paste the output of it here. I don't have a Solaris box handy to find this out myself. The man page says "When the at-job is submitted, the at_job_id and scheduled time are written to standard error. The at_job_id is an identifier that will be a string consisting solely of alphanumeric characters and the period character. The at_job_id is assigned by the system when the job is scheduled such that it uniquely identifies a particular job." The original regexp I posted is wrong for Solaris, given this, because the job_id is a flavor of (\S+) and not (\d+).