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21141: fix some issues associated with the {myfd}>... syntax

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This commit is contained in:
Peter Stephenson 2005-04-14 16:24:42 +00:00
parent 24c329275a
commit c69b149cb5
4 changed files with 104 additions and 11 deletions
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25
Doc/Zsh/redirect.yo
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@ -174,6 +174,27 @@ 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.
If the option tt(CLOBBER) is unset, it is an error to open a file
descriptor using a parameter that is already set to an open file descriptor
previously allocated by this mechanism. Unsetting the parameter before
using it for allocating a file descriptor avoids the error.
Note that this mechanism merely allocates or closes a file descriptor; it
does not perform any redirections from or to it. It is usually convenient
to allocate a file descriptor prior to use as an argument to tt(exec). The
following shows a typical sequence of allocation, use, and closing of a
file descriptor:
example(integer myfd
exec {myfd}>~/logs/mylogfile.txt
print This is a log message. >&$myfd
exec {myfd}>&-)
Note that the expansion of the variable in the expression tt(>&$myfd)
occurs at the point the redirection is opened. This is after the expansion
of command arguments and after any redirections to the left on the command
line have been processed.
The `tt(|&)' command separator described in
ifzman(em(Simple Commands & Pipelines) in zmanref(zshmisc))\
ifnzman(noderef(Simple Commands & Pipelines))
@ -230,6 +251,10 @@ example(sort <f{oo,ubar})
is equivalent to `tt(cat foo fubar | sort)'.
Expansion of the redirection argument occurs at the point the redirection
is opened, at the point described above for the expansion of the variable
in tt(>&$myfd).
Note that a pipe is an implicit redirection; thus
example(cat bar | sort <foo)