Basic Linux Commands

Command	Description
Date	Show date and time
free	Display used memory status
id	User id , group id and group of your account
groups	Tells, which account you logged in.
cal	Display a calendar
cat	Concatenate files and print on the standard output
chdir	Change working directory
logname	Print user's login name
chroot	Change root directory
mkdir	Makes a directory
clear	Clear terminal screen
shutdown	Shutdown in a secure way
unmae -a	Tell O.S, hostname, kernal version, date & Time and processor
cp	Copy one or more files to another location
w	Who is logged on and what he is doing
ls	To list all directoeies
history	To see all command historyl
cut	Divide a file into several parts
date	Display or change the date & time
dc	Desk Calculator
gzip	To create compressed file
df	Display free disk space
gzip -d	To un compress
dir	Briefly list directory contents
dirname	Convert a full pathname to just a path
echo	Display message on screen
free	Display memory usage
fsck	Filesystem consistency check and repair
grep	Search file(s) for lines that match a given pattern
groups	Print group names a user is in
gzip	Compress or decompress named file(s)
hostname	Print or set system name
id	Print user and group id's
info	Help info
install	Copy files and set attributes
join	Join lines on a common field
kill	Stop a process from running
java --version	To see detail information of java
logname	Print current login name