Which among the following statement is not

Which symbol is used to comment a single line in shell scripts?

Which command is used to search text patterns in files?

OLAP is primarily used for:

How do you access the value of a variable named `USERNAME` in a shell script?

Which command is used to search for a string inside a file?

Which command is used to combine the contents of multiple files?

Which command is used to display all currently running processes in Linux?

Which symbol is used to redirect the standard output of a command to a file, appending the output to the end of the file if it already exists?

What does #!/bin/bash at the start of a script mean?

How do you typically make a shell script file executable?