As in any other programming language, you can use variables in Bash Scripting as well. However, there are no data types, and a variable in Bash can contain numbers as well as characters.<\/p>\n\n\n\n
To assign a value to a variable, all you need to do is use the {notice} as an important note, you can not have spaces before and after the After that, to access the variable, you have to use the Wrapping the variable name between curly brackets is not required, but is considered a good practice, and I would advise you to use them whenever you can: echo ${name}<\/p>\n\n\n\n The above code would output: Next, let’s update our Again, you can open the file Adding our Save it and run the file using the command below: .\/devdojo.sh<\/p>\n\n\n\n You would see the following output on your screen: Hi there DevDojo<\/p>\n\n\n\n Here is a rundown of the script written in the file:<\/p>\n\n\n\n You can also add multiple variables in the file as shown below: #!\/bin\/bash name=”DevDojo” greeting=”Hello” echo “$greeting $name”<\/p>\n\n\n\n Save the file and run it again: .\/devdojo.sh<\/p>\n\n\n\n You would see the following output on your screen: Hello DevDojo<\/p>\n\n\n\n Note that you don’t necessarily need to add semicolon You can also add variables in the Command Line outside the Bash script and they can be read as parameters: .\/devdojo.sh Bobby buddy!<\/p>\n\n\n\n This script takes in two parameters So now let’s change the The ouput for: .\/devdojo.sh Bobby buddy!<\/p>\n\n\n\n Would be the following: Hello there Bobby Hello there buddy! Hello there Bobby buddy!<\/p>\n\n\n\n <\/p>\n\n\n\n=<\/code> sign: name=”DevDojo”<\/p>\n\n\n\n\n
=<\/code> sign.<\/p>\n<\/blockquote>\n\n\n\n$<\/code> and reference it as shown below: echo $name<\/p>\n\n\n\nDevDojo<\/code> as this is the value of our name<\/code> variable.<\/p>\n\n\n\ndevdojo.sh<\/code> script and include a variable in it.<\/p>\n\n\n\ndevdojo.sh<\/code> with your favorite text editor, I’m using nano here to open the file: nano devdojo.sh<\/p>\n\n\n\nname<\/code> variable here in the file, with a welcome message. Our file now looks like this: #!\/bin\/bash name=”DevDojo” echo “Hi there $name”<\/p>\n\n\n\n\n
#!\/bin\/bash<\/code> – At first, we specified our shebang.<\/li>\n\n\n\nname=DevDojo<\/code> – Then, we defined a variable called name<\/code> and assigned a value to it.<\/li>\n\n\n\necho \"Hi there $name\"<\/code> – Finally, we output the content of the variable on the screen as a welcome message by using echo<\/code><\/li>\n<\/ul>\n\n\n\n;<\/code> at the end of each line. It works both ways, a bit like other programming language such as JavaScript!<\/p>\n\n\n\nBobby<\/code>and buddy!<\/code> seperated by space. In the devdojo.sh<\/code> file we have the following: #!\/bin\/bash echo “Hello there” $1<\/p>\n\n\n\n$1<\/code> is the first input (Bobby<\/code>) in the Command Line. Similarly, there could be more inputs and they are all referenced to by the $<\/code> sign and their respective order of input. This means that buddy!<\/code> is referenced to using $2<\/code>. Another useful method for reading variables is the $@<\/code> which reads all inputs.<\/p>\n\n\n\ndevdojo.sh<\/code> file to better understand: #!\/bin\/bash echo “Hello there” $1 # $1 : first parameter echo “Hello there” $2 # $2 : second parameter echo “Hello there” $@ # $@ : all<\/p>\n\n\n\n