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Linux Basic commands

                  Usefull Linux Basic Commands to learn. A command is an instruction given by a user telling a computer to do something.Commands are generally issues by typing them in at the command line and then pressing enter key,which passes them in to shell. A shell is a program that reads commands that are types on a keyboard and then executes them.It is the most basic method for a user to interact with the system.


cd Changes directory
cd .. Move up one directory
cd ~ Take you back to your home directory
mkdir Make directory
rmdir Remove directory
ls list files
mv Move file from one directory to another
cp copy file with *.bak
tat cvf *.tar dirname/ c->Create a new archive
v->files which are processed
f->following is the archive filename
The cvf option does not provide any compression
tar cvzf  *.tar.gz dirname/ zip compression by using z option
unzip filename unzip the file name
tar -xzvf *.gz Extract the zipfile
df disk free
df -H -Show the no of occupied blocks in GB,MB
free Displays information about RAM and swap space
touch filename.* Create file
rm -f filename.* Remove file
rm -rf filename.* Remove folder
date MMDDHHmmYYY To set date
Set time and date date -s “19 APR 2012 11:14:00
About Permissions date -s “19 APR 2012 11:14:00
About Permissions  1)chmod 755(or)0755—-> drwxr-xr-x d->denotes type of file Group and world should not be enable to write access.thats denotes “-”

2)chmod 644(or)0644——>drw-r–r–

3)chmod 700(or)0700——->drwx——

For Linux Distribution Commands Refer this link Linux Distro-Command

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