Midterm 2 Review

You need to know the following about awk:

• Internal variables and defaults for input and output field separators.
• Use printf; how to print leading zeros and how to left or right justify a value.
• Use regular expressions to determine which lines will be selected for processing.
• Remember that ^ means something different inside square brackets than when it is outside square brackets.
• Be able to use POSIX character classes like [:alpha:]
• Know about variables like NF and NR.
• Know when BEGIN and END are processed.
• Redirecting output from within an awk script.
• Use the if, else, and else if constructs.
• Know how command line arguments are handled and counted.
• Know how to index arrays by number and by string (associative arrays).
• Know how to use numeric functions such as sqrt and string functions such as index
• Know how to work with random numbers.