In Bash, what does the shift command do?

• A. It assigns the value of $2 to $1 and then unsets $2.
• B. It prints all the arguments.
• C. It removes the first command-line argument from the list.
• D. It creates a new environment variable

Answer: (A)

Shifting positional parameters in Bash changes the argument list for the current script or function. When you perform a shift, the next argument becomes the first one, and the list shortens by the shift amount. With the common case (shift with no number), the value that was in $2 becomes the new $1, the value that was in $3 becomes the new $2, and so on, effectively discarding the original first argument.

In that sense, you can think of it as taking what was in $2 and making it $1, while the rest slide down one position and the total count decreases. That’s why this option is the best description among the choices: it captures the core effect of reindexing the positional parameters and dropping the first argument.

It doesn’t print all arguments, nor does it create a new environment variable. It operates on the positional parameters, not on output or environment.