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Diffstat (limited to 'Doc/Zsh/options.yo')
| -rw-r--r-- | Doc/Zsh/options.yo | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Doc/Zsh/options.yo b/Doc/Zsh/options.yo index c8b651132..105870039 100644 --- a/Doc/Zsh/options.yo +++ b/Doc/Zsh/options.yo @@ -1244,6 +1244,31 @@ tt(readonly), are processed. Without this option, zsh will perform normal word splitting after command and parameter expansion in arguments of an assignment; with it, word splitting does not take place in those cases. ) +pindex(KSH_ZERO_SUBSCRIPT) +cindex(arrays, behaviour of index zero) +item(tt(KSH_ZERO_SUBSCRIPT))( +Treat use of a subscript of value zero in array or string expressions as a +reference to the first element, i.e. the element that usually has the +subscript 1. Ignored if tt(KSH_ARRAYS) is also set. + +If neither this option nor tt(KSH_ARRAYS) is set, accesses to an element of +an array or string with subscript zero return an empty element or string, +while attempts to set element zero of an array or string are treated as an +error. However, attempts to set an otherwise valid subscript range that +includes zero will succeed. For example, if tt(KSH_ZERO_SUBSCRIPT) is not +set, + +example(array[0]=(element)) + +is an error, while + +example(array[0,1]=(element)) + +is not and will replace the first element of the array. + +This option is for compatibility with older versions of the shell and +is not recommended in new code. +) pindex(POSIX_BUILTINS) item(tt(POSIX_BUILTINS) <K> <S>)( When this option is set the tt(command) builtin can be used to execute |