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Diffstat (limited to 'Doc/Zsh/redirect.yo')
| -rw-r--r-- | Doc/Zsh/redirect.yo | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Doc/Zsh/redirect.yo b/Doc/Zsh/redirect.yo index 167c3ef21..3ce4b4369 100644 --- a/Doc/Zsh/redirect.yo +++ b/Doc/Zsh/redirect.yo @@ -149,6 +149,31 @@ file descriptor 2 would be associated with the terminal (assuming file descriptor 1 had been) and then file descriptor 1 would be associated with file var(fname). +If instead of a digit one of the operators above is preceded by +a valid identifier enclosed in braces, the shell will open a new +file descriptor that is guaranteed to be at least 10 and set the +parameter named by the identifier to the file descriptor opened. +No whitespace is allowed between the closing brace and the redirection +character. The option tt(IGNORE_BRACES) must not be set. +For example: + +indent(... {myfd}>&1) + +This opens a new file descriptor that is a duplicate of file descriptor +1 and sets the parameter tt(myfd) to the number of the file descriptor, +which will be at least 10. The new file descriptor can be written to using +the syntax tt(>&$myfd). + +The syntax tt({)var(varid)tt(}>&-), for example tt({myfd}>&-), may be used +to close a file descriptor opened in this fashion. Note that the +parameter given by var(varid) must previously be set to a file descriptor +in this case. + +It is an error to open or close a file descriptor in this fashion when the +parameter is readonly. However, it is not an error to read or write a file +descriptor using tt(<&$)var(param) or tt(>&$)var(param) if var(param) is +readonly. + The `tt(|&)' command separator described in ifzman(em(Simple Commands & Pipelines) in zmanref(zshmisc))\ ifnzman(noderef(Simple Commands & Pipelines)) |