Linux commands

Some Linux commands that might help you ..!!

ctrl + d - controls character signals the end of the input file

dmseg - command shows kernel log msg

stty - command is used to set terminal IO characteristic

script - command is used to record a user login session in a file

uname - command is used to display the system parameters

lpr - command is used to print a file

ulimit - command you find resource limits to the session

ls -i - command used to view file inode number

od - command is used to display the octal value of the text

zcat - command is used to view compressed text file contents

tee - command is used to extract intermediate results in a pipeline

cut - command is used to extract a column from a text file

du - command is used to display the disk consumption of a specific directory

cpio - command is used to perform backup in Unix

File - command is used to identify the file type

dd and rawrite - command is used to create a Linux installation boot floppy

/etc/hosts - file specifies the order in which to use specified name services

rpm -i - the command used to install rpm packages

mkfs - command do you use to create Linux file systems

ps - the command is used to display the characteristics of a process

R - command is used with vi editor to replace text from cursor to right

h - command is used with the vi editor to move the cursor to the left

#,- What sign is used to back up over typing errors in vi

3 dw - command is used with the vi editor to delete three words

@ - the sign is used to erase or kill an entire line you have typed and start you are on a new line

b - command is used with the vi editor to move back to the beginning of a word

/ - command is used with the vi editor to search a pattern in the forward direction

e - command is used with the vi editor to move forward to the end of a word

lpr - the command is used to add printing jobs to the queue

lpc - command is used to remove jobs from the print queue

named - server is used with the BIND package

smbclient - command is used to access an SMB share on a Linux system

rpcinfo - command is used to see the services running in NFS server

cpio - command is used to copy directory structures in and out

tee - command is used to save the standard output in a file, as well as display it on the terminal

umask - command specifies the permissions that the user does not want to be given out to the newly created file or directory

rpm -q - command is used to query for a specific package with RPM

/etc/profile - script is run for setting bash global defaults for all users

In /etc/ftpuser - file can you specify which users are not allowed to access a system via FTP

cron - program is used to schedule particular jobs or programs at particular times on the system

sync - command can force all buffers to disk

updatedb - command is used to be executed frequently to refresh locate database so that locate command can find new files created

82 - the partition's system ID type be,to create a swap partition by using fdisk, the partition's system ID type be

/etc/services - file contains the list of port numbers (and associated names) monitored by inetd

/sbin - location of some system configuration and system administrator executable files

/usr - location for subdirectories for local programs and executables for user and administrative commands

--recompile - you can rebuild the RPM file to include the new patches

/sbin/edquota - command is used to set user and group quotas

2GB - is the maximum size of a swap partition (with kernel version 2.2.x), To increase the amount of memory available for a system,

/etc/fstab - file is used to configure which filesystems are mounted

/dev - subdirectory(ies) contains the device files

/etc - subdirectory(ies) contains the system boot scripts

fsck - tool is used to check and repair Linux file systems

fdisk - tool is used to partition your hard drive

/var/log - can system and mail logs be found in Ret Hat Linux

cat - command is used to display and create files

head - command is used to display the top of the file

who am i - command can be used to get information about yourself

layer 7 protocol - layer protocol is responsible for user and the application program support such as passwords, resource sharing, file transfer and network management

SMB (Samba) Connectivity - package group will you select during the custom configuration to enable the machine to communicate with Windows clients

switchdesk - following tool allows you to change your default X Window desktop

lp - command is used to print a file

TFTP - TCP/IP protocol is used for file transfer with minimal capability and minimal overhead

SMTP - TCP/IP protocol is used for transferring electronic mail messages from one machine to another

GNOME is based on - COBRA toolkit

ipchains - can be used to set up a firewall on a Linux system

mkkickstart - program is used to automatically install Red Hat Linux on identical hardware

SSH - service is not monitored by inetd (internet service daemon)

? - shell's wild-card is used to match a single character

*- shell's wild-card is used to match all characters

route - command do you use to add routes to a Linux router

nfsmount ,knfsd , mount - commands are used to mount NFS filesystems

82 and 83 - are the appropriate Hex codes for setting Linux swap and Linux native partition types in fdisk

/etc/lilo.conf - you have to edit to boot your new kernel image after you have compiled your kernel

cmp - command is used to compare the files

du - command is used to summarize the disk usage

DOS - format of partition tables does Linux use

ypwhich - NIS clients return the name of the NIS server used by the NIS client

which - Command used to determine the path of an executable file

ls-aR - command is used to display all the files including hidden files in your current and its subdirectories

ftp - command can be used to copy files across systems

umask - command can be used to change default permissions for files and directories at the time of creation

tvf - command option is used to list the files in a tape archive format

date +%d/%m/%Y - command to display the current date in the form dd/mm/yyyy

cat sample.txt|more - command syntax to display the file ‘sample.txt’ one page at a time

tar -rvf file1 example.tar - to add (append) a file “file1” to the example.tar file

:!ls - to execute ls command inside a vi editor

cmp - command gives the first byte where the difference is in the file1 & file2

vi +num file1 - To open a file file1 with cursor at line number 4

talk - communication command provides communication to another user logged on by writing to the bottom of their terminal

tput - screen manipulation command

netstat -r - command will you use to see the available routes