Sams Teach Yourself Shell Programming in 24 Hours, Second Edition

Hour 5

1:	Which file descriptors are associated with STDOUT, STDERR and STDIN?
A1:	The file descriptors associated with STDOUT, STDERR, and STDIN are 0, 2, and 1 respectively.
2:	Use printf to convert the numbers 16, 255, and 65535 into hexadecimal and octal.
A2:	You can use the following printf statements: printf "0%o 0%o 0%o \n" 16 255 65535 printf "0x%x 0x%x 0x%x\n" 16 255 65535
3:	Given the following script: exec 4>out.txt exec 5>&4 exec 1>&5 date Where does the output from date end up?
A3:	The output ends up in the file out.txt.