Linux command line and Bash Shell Scripting

Explore how to run bash scripts on macOS, compare terminal options like iTerm2 and the default Terminal, and understand cross-platform nuances of hostname, uname, and diskutil in macOS and Linux.

Explore environment variables in Linux and Mac bash environments, learn how to define, export, and unset variables, and manage PATH and library paths while spawning child shells.

Explore the Linux file system hierarchy, starting at the root, and examine common directories like /bin, /usr, /lib, /home, and /proc, with notes on mounting and Linux-versus-Unix differences.

Learn how the ls command lists files and directories, uses -l for permissions and sizes, reveals hidden files with -a, navigate with cd, view manuals with man, and exit.

Explore essential Linux commands such as cat, rm, and history. Learn to view, create, and delete files and directories, use redirection and pipes, and perform recursive deletions.

Explore copying with cp, moving and renaming with mv, and how source and destination relate to file blocks and inodes in Linux, with practical command examples.

Identify who is logged in with the who command and verify your user with whoami. Use which and locate to find command paths, and navigate with cd and ls.

Explore the Linux calendar and date commands using cal to view calendars. Use date to format or set times, including time zones and custom formats like %m-%d-%Y.

Master vi and vim basics: switch between insert and normal modes, edit with i and escape, delete with dd or x, copy with yy, join lines with J, search /.

Learn vi basics: save with :w, quit with :q or :q!, save and quit with :wq; yank and paste; manage tabs and splits with :vsp and :sp; navigate with hjkl.

Master linux file permissions with chmod, setting read, write, and execute for user, group, and others. Explore octal and symbolic modes, including sticky bits and setuid/setgid.

Explore how to use chown, chgrp, and chmod to manage file ownership and permissions, including recursive changes on directories, and retrieve system users and groups with getent.

Learn to manage background and foreground jobs in bash, using jobs and %1, bring tasks to the foreground, stop with ctrl-c, and redirect output.

Sort text and numbers with the sort command, explore ASCII and numeric order (-n) with optional -r, and remove duplicates by piping to uniq, using -u for unique lines.

Learn to use top and ps to monitor system status, processes, and resource usage, and to harvest output in batch mode for scripting and logging.

Explore file descriptors in Linux and Unix, learn how standard input, output, and error streams redirection work, including creating, overwriting, appending to files, and using dev/null.

Examine pipes and redirection in bash, including file descriptor basics, redirecting output to files, appending, and chaining commands with pipes using tools like less, find, and wc.

Explore wild cards in the Linux command line, using ?, *, and bracket ranges to match characters and file patterns; escape spaces with backslashes and explore grep and regex.

Shell scripts are interpreted and use hash comments. Learn debugging with bash -x and syntax checking with bash -n, while handling script name $0 and arguments $1, $2.

Explore trap and signal handling in bash, restoring signals after cleanup, customizing sigint behavior on control-C, and implementing time-based double-press logic.

Install Ubuntu in a virtual machine on Mac using a 64-bit ISO, configure memory and disk, and complete the setup to boot into Unity.

Learn to use dd and od to copy files, create sparse or filled files from /dev/zero, and inspect binary data with hex output, while heeding data loss warnings.

Discover disk usage with df and du, using human-readable formats and awk. Inspect open files and network activity with lsof and netstat on Mac and Linux.

Explore Linux hardware inspection using less cpu, less usb, and less pci to view cpu, usb, and pci details; retrieve bios, dmi, and smbios data with dma decode on VMware.

Attach a new disk, identify the device, and partition it with a partitioning tool. Format the partition with a filesystem and mount it to a directory.

Use nmap for network and port scanning, revealing open ports and services as a security scanner. Install and run it on macOS or Linux, tuning timing and addressing firewall blocks.

Learn how to securely connect to a remote Linux machine with ssh, copy files with scp, and use sshpass and options like port, username, and X11 forwarding to streamline logins.

Learn to use tcpdump to capture traffic across an interface, save to a pcap file, and inspect icmp and port traffic, with verbose options for deeper analysis.