is the name of a UNIX command, executable program, or shell script ... For example, if the fileref is used in an INFILE statement, then the SAS System assumes that the input comes from a UNIX command; ...

The LOG statement sends the enquoted message to the log file or to ... to the UNIX spawner, the string "Hello >" is received and the control branches to the unxspawn label in step 10. Verify that the ...