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User Commands readonly(1)
NAME
readonly - shell built-in function to protect the value of
the given variable from reassignment
SYNOPSIS
sh
readonly [name...]
ksh
**readonly [ name [ = value]...]
**readonly -p
DESCRIPTION
sh
The given names are marked readonly and the values of the
these names may not be changed by subsequent assignment. If
no arguments are given, a list of all readonly names is
printed.
ksh
The given names are marked readonly and these names cannot
be changed by subsequent assignment.
When -p is specified, readonly writes to the standard output
the names and values of all read-only variables, in the fol-
lowing format:
"readonly %s=%s\n", name, value
if name is set, and:
"readonly $s\n", name
if name is unset.
The shell formats the output, including the proper use of
quoting, so that it is suitable for reinput to the shell as
commands that achieve the same value and readonly
attribute-setting results in a shell execution environment
in which:
1. Variables with values set at the time they were output
do not have the readonly attribute set.
2. Variables that were unset at the time they were output
do not have a value at the time at which the saved out-
put is reinput to the shell.
SunOS 5.10 Last change: 17 Jul 2002 1
User Commands readonly(1)
On this man page, ksh(1) commands that are preceded by one
or two ** (asterisks) are treated specially in the following
ways:
1. Variable assignment lists preceding the command remain
in effect when the command completes.
2. I/O redirections are processed after variable assign-
ments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in
the format of a variable assignment, are expanded with
the same rules as a variable assignment. This means that
tilde substitution is performed after the = sign and
word splitting and file name generation are not per-
formed.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
ksh(1), sh(1), typeset(1), attributes(5)
SunOS 5.10 Last change: 17 Jul 2002 2
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This page was generated on Wed Sep 12 11:25:19 GMT 2007
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