Bash script using default value for empty parameter

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Problem

You have a bash script that accepts parameter(s) but you want to give a default value for a missing parameter.

Solution

For example you have a script that accepts a parameter with the year and month (ie 201703), but you want to give it a default of two months ago if the parameter is missing.

Password – less logins and aliases with ssh

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Problem
You want to be able to login to different servers with ssh, but don’t want to be using your password every time.

Solution
We assume that you already have installed ssh and have created ssh public keys in your local machine.

  1. Run the following in your local machine:
  2. If you want to add aliases in your bash profile so you don’t have to type the whole address of the remote host, edit your .bashrc and add:
  3. Restart your X server, or simply start a new terminal session
  4. You should be able to login with ssh without using your password by typing in your command prompt in your local machine: