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bash
"Bullet hell" game where you control beloved penguin Tux and must defeat an evil mutant Window.
mapfile
| Expression | What it does |
|---|---|
${parameter:-defaultValue} |
Get default shell variables value |
${parameter:=defaultValue} |
Set default shell variables value |
${parameter:?"Error Message"} |
Display an error message if parameter is not set |
${#var} |
Find the length of the string |
${var%pattern} |
Remove from shortest rear (end) pattern |
${var%%pattern} |
Remove from longest rear (end) pattern |
${var:num1:num2} |
Substring |
${var#pattern} |
Remove from shortest front pattern |
${var##pattern} |
Remove from longest front pattern |
${var/pattern/string} |
Find and replace (only replace first occurrence) |
${var//pattern/string} |
Find and replace all occurrences |
${!prefix*} |
Expands to the names of variables whose names begin with prefix. |
${var,}<br>${var,pattern} |
Convert first character to lowercase. |
${var,,}<br>${var,,pattern} |
Convert all characters to lowercase. |
${var^}<br>${var^pattern} |
Convert first character to uppercase. |
${var^^}<br>${var^^pattern} |
Convert all character to uppercase. |
ShellCheck - A shell script static analysis tool