mirrors/zsh
1
0
Fork 0
mirror of git://git.code.sf.net/p/zsh/code synced 2025-09-07 23:51:14 +02:00
Code Releases Activity

30740: add example of process substitution using anonymous function

Browse source
This commit is contained in:
Peter Stephenson 2012-10-18 16:18:57 +00:00
parent a02f3b6910
commit 02225925ef
2 changed files with 22 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
ChangeLog
View file

@ -1,5 +1,8 @@
2012-10-18 Peter Stephenson <pws@csr.com>
* 30740: Doc/Zsh/expn.yo: add example of process substitution
with anonymous function.
* c.f. users/17330: Doc/Zsh/expn.yo: fix reference to splitting
rule in parameter expansion rules.
@ -274,5 +277,5 @@
*****************************************************
* This is used by the shell to define $ZSH_PATCHLEVEL
* $Revision: 1.5746 $
* $Revision: 1.5747 $
*****************************************************

18
Doc/Zsh/expn.yo
View file

@ -483,6 +483,24 @@ example(LPAR()mycmd =(myoutput)RPAR() &!)
as the forked subshell will wait for the command to finish then remove
the temporary file.
A general workaround to ensure a process substitution endures for
an appropriate length of time is to pass it as a parameter to
an anonymous shell function (a piece of shell code that is run
immediately with function scope). For example, this code:
example(LPAR()RPAR() {
print File $1:
cat $1
} =+LPAR()print This be the verse+RPAR())
outputs something resembling the following
example(File /tmp/zsh6nU0kS:
This be the verse)
The temporary file created by the process substitution will be deleted
when the function exits.
texinode(Parameter Expansion)(Command Substitution)(Process Substitution)(Expansion)
sect(Parameter Expansion)
cindex(parameter expansion)