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System User's Guide: Operating System and Devices
Reserved Words in the Korn Shell or POSIX Shell
The following reserved words have special meaning to
the shell:
! case do
done elif else
esac fi for
function if in
select then time
until while {
} [[ ]]
The reserved words are recognized only when they appear
without quotation marks and when the word is used as the following:
- First word of a command
- First word following one of the reserved
words other than case, for, or in
- Third word in a case or for command (only in is valid in this
case)
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