Errata

The sed format example has an erroneous / at the end.

The example "sort -k 2 file1.txt" should read "sort -k 3 file1.txt" to sort by the filename column.

The example "sort -k 1.5,1.7 file1.txt" should read "sort -k 2.5,2.7 file1.txt" to sort by the IP address column.

When using the sort command, the first column starts at position 1.

The parseArgs function didn't have all the code in that it should have had. Modifications to the arg list and count (e.g., $#), while valid during the function call, are back to their original values on return from the function. If we want to parse the args in a function we have to first, pass in the arguments on the call to the function, and then all the logic related to parsing should be put inside the function. To fix our code we could have moved more code from the mainline to inside the function. Instead, we chose to move the code out of the function and back into the mainline of the program.

The hexadecimal value for the ASCII character 'o' should be 6f, not 30 which is the ASCII character for the number 0. The resulting ciphertext for the letter should be b6, not e9.

The expression \"$1 should be enclosed in quotes: "\"$1"

The 'echo' statement should be under the 'then' clause, not the 'else' clause. The line 'ending=${passin:6}' should read 'ending=${passin:5}'.