Shell Scripting and Security by Dave Taylor. on February 13, 2018. ... keep an eye on /etc/passwd ... Dave Taylor has been hacking shell scripts on UNIX and Linux systems for a really long time. He's ...

To prevent the shell from interpreting the gawk commands as shell commands, enclose the program within single quotation marks. ... The AWK language was originally implemented under UNIX as the awk ...

Unix and eight character usernames go back a long way, even further back than eight character filenames in DOS. What surprises me is that longer usernames can still present problems.