Few Shell Commands

skulker [-irw] [-l logfile] directory days_old 

Removes files in directory older than specified number of days

shell script in /samples ƒ 

- copy to /bin/skulker or /usr/sbin/skulker ƒ 
- can be modified by installation ƒ 
- Protect it from hackers! (make it non-writable) 

e.g. skulker /tmp/ 100 ƒ

deletes files in /tmp older than 100 days ƒ
trailing slash follows a /tmp symlink to another directory

- use cron to schedule it to run regularly

fuser [-cfku] file ... 

- List process IDs of processes with open files ƒ
- Useful for finding the current users of a file, or a filesystem (e.g. before unmount) ƒ
- e.g. fuser -cu /usr/lpp/dfs shows who is using the containing filesystem

uptime 

-ƒ Display how long the system has been IPLed ƒ
- e.g. uptime 01:02PM up 14 day(s), 01:15, 58 users, load average: 0.00, 0.00, 0.00

Finding file opens in Unix

rbd2/u/drbd:>fuser -u $LOGS/evtlog.2016-04-12

/plex/var/trb/rbd2/dps1/logs/evtlog.2016-04-12: 33620442(DRBD)

rbd2/u/drbd:>ps -p 33620442

       PID TTY       TIME CMD

  33620442 ?         1:09 /plex/var/trb/rbd2/dps1/lib/sislib/sievtq.exe