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25 Cards in this Set
- Front
- Back
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user config files are usually hidden. they are called 'dot files' show configuration files in your home directory
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ls -a
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system config files are kept where
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/etc
they can only be edited by root superuser |
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the advantage of configuration files
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you may copy a config file from machine to machine to place certain appearances, settings, and behavior of programs for multiple users
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environment variables do what
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programs write and read from environment variables. It Keep track of the state of the system
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print to screen all the environment variables
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env | more
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print your working directory
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pwd
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when you have multiple commands in your PATH directory and you execute a command how do you know where that command is being executed?
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which pwd
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check your environment vairables and tell me what your default terminal is.
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env | more
'in here you will find a section called TERM' TERM=xterm |
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set your default TERM (terminal) to be vt100 instead of the default xterm
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TERM=vt100
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check your environment vairables and tell me what your default terminal is.
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env | more
'in here you will find a section called TERM' TERM=xterm |
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set your default TERM (terminal) to be vt100 instead of the default xterm
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TERM=vt100
export |
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check your environment vairables and tell me what your default terminal is.
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env | more
'in here you will find a section called TERM' TERM=xterm |
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set your default TERM (terminal) to be vt100 instead of the default xterm
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export TERM=vt100
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all profiles are kept in the
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/etc/profile
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your own personal profile path is kept where
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more .bash_profile
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most system configuration files are kept where.
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/ect
ls -a |
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where are the system startup directories kept
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cd rc.d
ls rc.sysinit ....or it's in the ... cd /ect/init.d DO NOT MANIPULATE THESE FILES. ONLY EDIT THE rc.local file !!!!! |
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what are the run levels of Linux
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0 off
1 single user mode 2 multi-user without networking 3 multi-user with networking 4 varies 5 Xwindows 6 shutdown, reboot |
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when you are looking at the run level files rc1.d rc2.d rc3.d and so on. If there is a 'K' in front of that file what does it mean. If there is an 'S' in front what does it mean
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ls rc3.d
when listing a system startup file items that start with 'K' will be killed before startup of the system. Items listed with an 'S' are the only ones that start when this run level is choosen at boot. To change what starts or is killed at boot in this particular run level simply change the first letter from 'K' to 'S' or vice-versa. NOTE: the numbers after the 'K' or 'S' are DEPendency numbers, lower number must start first. if you change an item to 'S' make sure that it has a higher number then an item it depends on to start. Or simply choose a higher run level. |
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if you are not sure how your system is set to boot how can you get Linux to show you its boot modes and the default run level
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more initttab
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Xwindows just went down and will not start. How do you temporarily change the run level to a more basic startup without Xwindows to re-configure that file
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'log into the computer remotely and use terminal'.
telinit 3 'where telinit is the temporary run level and 3 is the run level.' |
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shut down the computer in a nasty way damaging the disk.
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telinit 0
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shut down the system in the proper way
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shutdown
Note: man shutdown will tell you about the many options of shutdown. warnings, force reboot, filesystem checks shutdown. |
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temporarily stop one service from running.
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cd /etc/init.d
ls xfs stop 'go where the program is kept in the /etc/init.d directory then follow the command or program by stop. cd /etc/init.d/network stop |
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start a program for the /etc/init.d directory
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./xfs start ...or...
./xfs restart |
