default variable in bash 3 or bash 4
107557
Shell usage of ":-" and advantage
157196
Parsing variables from config file in Bash
158792
Bash expand variable in a variable
147454
Why does bash set $? (exit status) to non-zero on Ctrl-C or Ctrl-Z?
128374
what is $$ in bash?
124154
What exactly is an environment variable?
9467
How can we run a command stored in a variable?
137445
Why is $ the default symbol for a user shell and # the default symbol for a root shell?
130622
How do I set up bash completion for command arguments?
142486
What is the difference if I start bash with "/bin/bash" or "/usr/bin/env bash"?
18438
Spaces in variable assignments in shell scripts
9976
What is "declare" in Bash?
75274
Special variables in bash
109812
Issue an error when using empty shell variables
12269
How do I make Bash my default shell on Ubuntu?
89858
How to pass a literal variable reference (${foo}) as program argument in a run configuration
38607
Variable substitution with an exclamation mark in bash