Key references for various tools

The following post was contributed by Mike Weilgart who has recently joined the ranks of Linux system administrators.

For bash and POSIX shell scripting:

Variable quoting

• Security implications of forgetting to quote a variable in bash/POSIX shells
• Why does my shell script choke on whitespace or other special characters?
• Explanation of How quotes relate to argument lists

Miscellaneous

• What is a shell and what is a shell builtin?
• Why is printf better than echo?
• Why is using a shell loop to process text considered bad practice?

For vi and Vim:

• The article “Why, oh WHY, do those #?@! nutheads use vi?”
• Stack Overflow answer encapsulating basics of vi command language
• Stack Overflow answer encapsulating buffers vs. windows vs. tabs
• Quick tips for using buffers effectively

For git:

• What exactly do we mean by “branch”?
• The Think Like a Git website, including all of the links on the “Resources” page.

cgroups:

• Stack Exchange answer serving as an Introduction to cgroups