The ‘source’ command in Bash is used to read and execute commands from a file within the current shell environment. It’s beneficial when you want changes made by the script, like setting environmental variables or defining functions, to remain effective after the script ends. The syntax is ‘source filename’. If ‘filename’ contains function definitions, they become part of the current shell. If it sets variables, those changes persist. This differs from running a script with ‘./filename’, which launches a new shell that dies once the script concludes, discarding any changes.
