BASIC COMMANDS OF LINUX
cat {any file name} – This is a way to list the contents of files to the screen.
cd {any directorys} – Change directory
cd .. – Move to the parent directory of the current directory.
cd ~ – Move to the user’s home directory which is “/home/username”.
cp – Copy files
cp (sr.file) (des.file) – Copy the files “sr.file” to the file “des.file” in the current working directory.
cp -i (sr.file) (des.file) – With the “-i” option, if the file “des.file” exists, you will be prompted before overwrite
cp -i /data/sr.file – Copy the file “/data/sr.file” to the current working directory and name it “sr.file”.
cp -dpr (srcdir) (destdir) – Copy all files from the directory “srcdir” to the directory “destdir” preserving links.
dd – Disk duplicate.copy a file convert and formitting according to oprands.
df – Show the amount of disk space used on each mounted filesystem.
ln – (hard link) Creates a symbolic link to a file.
ln -s – (soft link) test symlink Creates a hard link to a file
locate – A fast database driven file locator.
slocate -u – command builds the database. This command must be used before searching for files.
locate whereis – Lists all files whose names contain the string “whereis”.
logout – Logs the current user off the system.
ls – List files in the current working directory and only show the file name.
ls -al – List all files in the current working directory in long listing format showing .
ls -al |more – If the directory listing is longer than a page, it will be listed one page at a time.
mv – Move or rename files
mv -i (srcfile) (destfile) – Move the file from “srcfile” to “destfile”.
pwd – Show the name of the current working directory
more /etc/profile – Lists the contents of the “/etc/profile” file to the screen one page at a time.
shutdown – Shuts the system down.
shutdown -h – now Shuts the system down to halt immediately.
shutdown -r – now Shuts the system down immediately and the system reboots.
whereis – Show where the binary, source and manual page files are for a command
whereis ls – Locates binaries and manual pages for the ls command.
init 0 – shutdown computer
ifup (eth0,eth1,etc) – activating internet connection
if config – show the configuration of linux system
source: http://go4linux.in