2 types of link files are present in linux:

Soft link and Hard link

Soft link	Hard link
Shortcut file	Backup file
size of link file is equal to the no of chars in original filename	size of both files are same
If original file is deleted, link is broken and data is lost	if original file is deleted then also link will contain all data
command: ln -s <source_file> <dest_file>	command: ln <source_file> <dest_file>

Soft link is similar to shortcut in windows

To execute command/shellscript from anywhere, create a soft link of the file in /usr/local/bin directory

ex:

touch hello.sh
cat > hello.sh
echo "hello world"
^C

execute this file in same directory:

./hello.sh

output: hello world

cd testdir/

execute hello.sh in another directory:

./hello.sh

output: -bash: ./hello.sh: No such file or directory

create a link of this shell script file to directory /usr/local/bin

ln -s /opt/training/hello.sh /usr/local/bin/hello

Now execute hello from any directory:

hello

output: hello world

Link Files in linux