diff options
Diffstat (limited to 'Doc/Zsh/expn.yo')
| -rw-r--r-- | Doc/Zsh/expn.yo | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo index 6f29a8778..416d46407 100644 --- a/Doc/Zsh/expn.yo +++ b/Doc/Zsh/expn.yo @@ -623,6 +623,16 @@ tt(${)var(name)tt(:-)var(word)tt(}) form of substitution; a space may be inserted before the tt(-). Furthermore, neither var(offset) nor var(length) may begin with an alphabetic character or tt(&) as these are used to indicate history-style modifiers. + +For further compatibility with other shells there is a special case +when the tt(KSH_ARRAYS) option is active, as in emulation of +Bourne-style shells. In this case array subscript 0 usually refers to the +first element of the array. However, if the substitution refers to the +positional parameter array, e.g. tt($@) or tt($*), then offset 0 +instead refers to tt($0), offset 1 refers to tt($1), and so on. In +other words, the positional parameter array is effectively extended by +prepending tt($0). Hence tt(${*:0:1}) substitutes tt($0) and +tt(${*:1:1}) substitutes tt($1). ) xitem(tt(${)var(name)tt(/)var(pattern)tt(/)var(repl)tt(})) item(tt(${)var(name)tt(//)var(pattern)tt(/)var(repl)tt(}))( |