How to convert string to lower case
There are several ways to convert uppercase strings to lowercase in Bash: tr, awk, Bash 4.0 expansion, or Perl.
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How to trim space from bash variable
A small Bash shell tip: remove trailing spaces, leading spaces, or both from a variable with sed.
If / else statements on bash script
An overview of if/else statements in Bash scripts and comparison conditions. Basic if syntax: if [ condition ] then ... fi.
Bash Autocomplete feature on CentOS Linux
Bash autocompletion makes Linux work much more convenient. For me it is essential because it makes commands quicker to use.