b. echo Your file has been processed c. echo l; d. cp file /tmp 36. You can use the command to start a program with an environment variable setting that is not part of your current environment. c. use d. env a. export b. set 37. The command displays a list of all environment variables defined in your current environment. c. use d. env a. export b. set he environment variable contains a list of directories on the Linux system that the shell searches each time a command is executed. a. HOME b. BIN c. PATH d. EXE 39. What is the standard input channel? a. STDIN c. STDERR d. STDINPUT b. STDOUT Which redirection operator appends STDOUT output to the given file name (adding it to the end of any existing file contents)? 40. What is the pipe symbol? a. 41. d. 42. The command is a basic e-mail client that you can use from the command line to create an e-mail message. a. gmail c. mail