UNIX FINAL

uname -srv

Verbose output

Kernel (Ring 0):Kernel mode

the executing code has full, unrestricted access to the hardware

6 Reboot mode

All processes terminated; system is gracefully rebooted

2 Multi-user mode

Allows users to access the system; limited network services

present working directory command

pwd

what happens in the Basic Input/Output (BIOS) Phase?

performs the Power on Self-Test (POST) and the master boot record (MBR) is executed

how can the currently running shell can be determined?

echo $SHELL

location for scripts everyone on a system is allowed to use

/usr/local/bin

The kernel performs a privileged task on behalf of what?

the calling process (API/system call)

what command would you use to file system check; similar to chdsk in Windows cmd?

fsck

chmod 755

755 will allow anyone to execute

Where are individual crontab files located?

/home/user/.crontab

crontab, or cron table

a configuration file specifying shell commands to be run on a given schedule

/etc/passwd: list of entries

a. Username

b. Password

c. UID

d. GID

e. Comment

f. Home dir

g. Default shell

To change to a different directory what command would you use?

cd

/etc - Critical Directory Critical subdirectories and files include?

/etc/passwd - Users and account information

Characters 2-4

owner permissions

Temporary files used by the system

/tmp

Characters 5-7

group permissions

Password encryption and aging

/etc/shadow

modifies default permission settings

unmask

Deletes a user account

userdel

Authentication and authorization

/etc/passwd

-G

supplementary/secondary group

how can you view contents of /etc backed up to tape?

tar -tvf /dev/rm0