1001  crontab -e
 1002  crontab -l
 1003  emacs /var/spool/mail/st10
 1004  crontab -e
 1005  emacs /var/spool/mail/st10
 1007  ls 2*
 1008  crontab -e
 1009  cat lect14-2-play.txt | wc -l
 1010  cat lect14-2-play.txt 
 1011  crontab -r
 1012  crontab -e
 1013  crontab -l
 1014  uptime
 1015  top
 1016  top
 1017  nice -n 3 top
 1018  uptime
 1019  mkdir 279lect14-2
 1020  cd 279lect14-2
 1021  ls
 1022  date
 1023  at 15:36pm
 1024  date
 1025  at 3:36pm
 1026  at -l
 1027  ls
 1028  ls
 1029  date
 1030  ls
 1031  cat at-play.txt 
 1032  at -l
 1033  at -l
 1034  at 9:00pm
 1035  at -l
 1036  atrm
 1037  at -l
 1038  atrm 2
 1039  at -l
 1040  batch
 1041  at -l
 1042  ls
 1043  more batch-play.txt 
 1044  echo "<$IFS>"
 1045  ls
 1046  mail