First, broad-reaching vulnerabilities disclosed in open SSH (Heartbleed) and the
Bash shell (Shellshock) had to be dealt with: Code had to be reviewed, and if vulnerable versions of these highly ubiquitous services were found, they needed to be patched.
Fox, a professor of computer science at Northern Kentucky University, bridges OS concepts with LINUX commands to teach readers about kernels, file systems,
BASH shell scripting, and basic system administration and network management.