I am learning the usage of bash script, which is very useful to run lots of test on supercomputers that use Linux with bash.

String manipulation in bash

• Jim Dennis, bash String Manipulations.
  

Usage of getopt

• Ricardo Salveti, Bash: parsing arguments with ‘getopts.'
• Small getopts tutorial from Bash Hackers Wiki.

File name & file path

Hint: use the command readlink!

• How to: Get absolute/relative file paths, filenames and extensions from a Bash script from r3dux.org.