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commands:builtin:readonly [2011/01/03 17:26] thebonsai [Options] |
commands:builtin:readonly [2017/10/17 20:18] (current) ben_bash [Description] |
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| - | ====== The readonly builtin ====== | + | ====== The readonly builtin command ====== |
| ===== Synopsis ===== | ===== Synopsis ===== | ||
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| ===== Description ===== | ===== Description ===== | ||
| - | The ''readonly'' builtin command is used to mark variables or functions as read-only, which means unchangable. | + | The ''readonly'' builtin command is used to mark variables or functions as read-only, which means unchangeable. This implies that it can't be unset anymore. A ''readonly'' variable may not be redefined in child scopes. A readonly global may not be redefined as a function local variable. Simple command environment assignments may not reference readonly variables. |
| ==== Options ==== | ==== Options ==== | ||
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| ==== Return status ==== | ==== Return status ==== | ||
| - | The return status is 0 unless an invalid option or an invalid combination of options is given or a ''NAME'' is invalid. | + | ^Status ^Reason ^ |
| + | |0 |no error | | ||
| + | |!=0 |invalid option | | ||
| + | |!=0 |invalid combination of options | | ||
| + | |!=0 |a given ''NAME'' is invalid | | ||
| ===== Examples ===== | ===== Examples ===== | ||
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| ===== Portability considerations ===== | ===== Portability considerations ===== | ||
| - | ===== See also ===== | + | * in POSIX(r), only the ''-p'' option is specified |
| + | ===== See also ===== | ||
| + | * [[commands:builtin:declare]] | ||
| + | * [[commands:builtin:unset]] | ||