Really good on-line documentation on programming in shell scripting languages seems to be a rarity. On bash, I have found the following invaluable:
- “Advanced Bash-Scripting Guide” in HTML or PDF, hosted by the Linux Documentation Project.
- “An A-Z Index of the Bash command line for Linux“, hosted by ss64.com; see in particular the sections
If you really have to do something in MS DOS, then the following is very helpful:
- “An A-Z Index of the Windows XP command line“, again hosted by SS64.com; see in particular the sections