Day1 Bash.txt

Bash Scripting 


  

echo: It  is a Bash builtin command that writes the arguments it receives to the standard output.




=>Display Hello world 
1. Using Interactive Shell 
      
echo “Hello world”


Output:
Hello world




2. Using Non-Interactive Shell 
Commands
-create a file{ touch helloworld.sh}
-write code { vim helloworld.sh}
#!/bin/bash
echo “Hello world”


-execute permission
 chmod +x helloworld.sh


-Run code 
 ./helloworld.sh




Note: If /bin/bash PATH don’t exits then you should use /usr/local/bin/bash




=> Quote in String
There are two types of quoting:
   -double quote 
   -single quote


1. Display single quote 
       -script
 echo “ Name:’Valya’ “
  Output:
 Name:’Valya’


2. Display Double quote
      -script


   echo  “Country:\”India”\ “
  
  Output:
   Country:”India”






=> Display all command


  -script
#!/bin/bash  -x 


echo “hello world”




 -output 
  +echo hello world 
hello world