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* eval, exec, exit, export, readonly, set, shift, trap: use Open Group links * exec, export, trap: split Linux and POSIX
17 lines
593 B
Markdown
17 lines
593 B
Markdown
# readonly
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> Create or modify read-only variables within a shell script, preventing the variable from being changed by subsequent commands.
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> This is useful when you want to ensure that a variable retains a constant value throughout the execution of a script.
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> More information: <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#readonly>.
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- Create a read-only variable:
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`readonly {{variable_name}}={{value}}`
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- Mark a variable as read-only:
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`readonly {{existing_variable}}`
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- [p]rint the names and values of all read-only variables to `stdout`:
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`readonly -p`
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