Bash Scripting 2

 Bash Scripting

NOTE : Bash scripts can be run using "bash <file_name.sh>"

• Command : sleep <time in seconds>
• This command is used to leave a small interval of time in seconds between the execution of the code.
• The command after sleep execute once the given time gets over.
  

  
  

  Here the update command execute after 3 seconds. 1 2 3 will execute at the time interval of 1 second.
• 

• Using some Build in variable in bash:
• RANDOM
• This command is used to generate a random number.
• The range of the number lies from 0 to 32767.
• "$RANDOM" This command is used to produce the random variable.
• SHELL
• This command is used to display the current shell.
• Command : "$SHELL"
• PWD
• This command is used to display the current working directory.
• Command : "$PWD"
• HOSTNAME
• This command is used to diplay the host name.
• Which host is currently active.
• Command : "$HOSTNAME"

NOTE:

In the above example ,if $RANDOM is not displaying when using "./<file_name>" try 

bash <file_name> to run the script.