| $ |
Get default shell variables value |
| $ |
Set default shell variables value |
| ${parameter:?"Error Message"} |
Display an error message if parameter is not set |
| $ |
Find the length of the string |
| ${var%pattern} |
Remove from shortest rear (end) pattern |
| ${var%%pattern} |
Remove from longest rear (end) pattern |
| $ |
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,} ${var,pattern} |
Convert first character to lowercase. |
| ${var,,} ${var,,pattern} |
Convert all characters to lowercase. |
| ${var} ${varpattern} |
Convert first character to uppercase. |
| ${var^} ${var^pattern} |
Convert all character to uppercase. |
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