you may name the bash file without extension
to run the file
$ bash <path-to-file>
bash is an interpeter language which means that each line is compiled and run first
to run the file as executable you have to change permission first
$ chmod u+x <path-to-file>
$ ./<path-to-file>
To learn more about chmod command visit this link
if you run the command file <path-to-file>
the answer would be ASCII
That means the file written is a text file includes some ASCII characters
There is a header called shebang which is #!/bin/bash
This to identify the file to be run as a bash file
To set a debugger for bash script use the following syntax
set -x
# some code
set +x
to execute command form bash script you only need to write it example
#!/bin/bash
ls
the output would be the files in the same directory of bash script file
To store the output of command
#!/bin/bash
x=`ls` # backtick NOT single quotation
echo ${ls}
&&, || , ;:
&& Executes Next Command if Previous command was successful
|| Executes Next Command if Previous command was NOT successful
; Executes Next Command regardless of whether the previous command was successful or not