- no daemon
- add, remove, list jobs by dedicated commands:
qadd,qrm,qls - user decides when and where to run the next job by
qrun- may put
qrunin scheduler (cron) or at the end of each submitted jobs; making the queue "automatically running" this way
- may put
- run jobs in series
- default queue control dir is per-user
- record command, environment, PID, exit status, etc. in separate files
- pending jobs are files in the queue control dir
- leave log management to each job
- queue IDs are sequential numbers
- at
- very mature tool
- present everywhere
- run jobs at a given time
- run as a daemon (atd)
- queue control dir is system-wide, multiuser
- queue IDs are sequential numbers
- nq
- no daemon
- start jobs right away
- run jobs in series
- default queue dir is the CWD
- record command, output, and exit status in a single file
- list jobs by
ls -F ,* - pending jobs are processes waiting for a lock
- queue IDs are timestamps+PID
- task spooler
- per-user daemon, start on-demand
- pueue