Linux Set 6
Terms
undefined, object
copy deck
- What command is used to change permissions?
- chmod
- What command will show all the jobs in a print queue?
- lpq
- What command will remove a jobid from a print queue?
- lprm <jobid>
- What command is used to control a print queue (reset spooler, etc.)?
- lpc
- What security risk does Telnet pose?
- password is sent in cleartext
- Logins from the console on a non-X environment are supported by what program in Linux?
- getty
- How is a locked terminal closed?
- by switching to another virtual terminal and killing the locked terminal
- What two methods can be used to uninstall LILO?
- restore the original boot sector with dd; or use a DOS disk to run fdisk /mbr
- How does Linux mark shadow passwords?
- with an 'x' in the second field of every line in the passwd file
- What does the 'P' command in Fdisk do?
- prints the current partition table
- What does the 'N' command in Fdisk do?
- creates a new partition
- What does the 'w' command in Fdisk do?
- writes work to disk (removes existing partitions)
- What does the 't' command in Fdisk do?
- changes the partition type
- What is partition type 82?
- swap partition
- What is partition type 83?
- regular filesystems
- What does the 'd' command in Fdisk do?
- deletes a partition
- What has to be done after a partition is created?
- it must be formatted with mkfs
- What should be done before running fsck on an active filesystem?
- unmount the partition
- What command is used to unmount a drive?
- umount
- What program can be used to schedule commands?
- cron
- What daemon handles scheduling?
- crond
- What format does crontab use to set date and time?
- 6 columns: minute hour day month weekday command
- What line will cause the output of a cron job to go to someone other than the owner of the crontab?
- MAILTO=<username>
- What command can be used to determine what program created a core dump?
- file
- What is a PID?
- process identifer
- What is a PPID?
- parent process ID
- What is the parent of all processes? What is its PID?
- init; PID=1
- What command can be used to list processes?
- ps
- When a program crashes, what is usually left behind?
- a core dump
- What command can be used if a normal "kill" command is ineffective?
- kill -9
- Where are general system messages stored?
- /var/log/messages
- Where are mail transfer messages stored?
- /var/log/maillog
- Where are security-related messages stored?
- /var/log/secure
- Where are status reports from the cron daemon stored?
- /var/log/cron
- What two files are historical data about logins stored in?
- /var/log/lastlog and /var/log/wtmp
- What two methods can be used to create backups?
- tarball and dump/restore