eval is a built-in Linux command which is used to execute arguments as a shell command. It combines arguments into a single string and uses it as an input to the shell and execute the commands.

What is eval command in bash?

eval is a builtin command of the Bash shell which concatenates its arguments into a single string. Then it joins the arguments with spaces, then executes that string as a bash command. Below is an example of how it works.

What does eval echo do?

It’s used to evaluate code dynamically. In shells, it’s implemented as a shell builtin command. Basically, eval takes a string as argument and evaluates/interprets the code in it.