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The basic syntax of if statement is shown below: if thenĪnything between the keywords then and fi will be executed only if the condition is true.įor better understanding, create a test-if.sh file: nano test-if.sh
#UBUNTU BATCH SCRIPT EXAMPLE CODE#
With if statements, you can decide whether or not to run a block of code based on a preset condition being met or not. If Statements in Bash Scriptsīash if statements are very useful and allow us to make decisions in bash scripts. You will be asked to provide your name and print the message with other string as shown below: What is Your Name? Save and close the file, then run the script using the following command: bash input.sh
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These commands will display a question, take input from the user, and print the value entered while also combining it with a string. To start, create a new bash script named input.sh: nano input.shĪdd the following lines. This will read whatever is entered by the keyboard and save it to the variable. You can accept input from the keyboard and assign a value to a user-defined shell variable using the read command. This is a very simple command, however, it can be useful when debugging your script or when you want to display some information to the user. This will print the following output: Hello World Once you have done the above, run the bash script using the following command: bash test.sh Then press Ctrl+X to exit the nano text editor. To save, press Ctrl+O and then press enter to confirm the filename. Continue by adding the following lines: #!/bin/bash Let’s write our first bash script example by creating a simple shell script file named test.sh that prints the line “Hello World”: nano test.sh You can run a bash script from the terminal, or by executing it from a bash file that is saved on your computer or server.
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All common distributions of Linux (Debian, Ubuntu, CentOS, Fedora, etc) are all able to run shell scripts.
#UBUNTU BATCH SCRIPT EXAMPLE PASSWORD#
Note: If you didn’t use -o “BatchMode yes”, the above command would’ve asked for the password for my account on the remote host. Local-host# ssh -o "BatchMode yes" Commandīatch mode command execution using SSH - success caseīatch mode command execution using SSH - Failure case If you use ssh -o “BatchMode yes”, then it will do ssh only if the password-less login is enabled, else it will return error and continues. If the password less login is not enabled, it will prompt for the password on the remote host as shown below. If you have the password less login enabled, following example will login to the remote host and execute the who command without asking for the password. In this article, let us review how instruct ssh/scp to do the operation only if you can do without waiting for password.īefore you try this out, make sure password less login is setup between your local host and remote host. If there are some issues with the password less login, your batch program may end up in a loop or timeout. When you have the password-less login enabled, you may be either using SSH to execute command in the batch mode on a remote machine or using SCP to copy files from/to the remote machine.