That's awesome, thank you!
Although I've been using parameter expansion ${var%pat} quite a bit, the pound and percent I've been confusing all along. The mnemonic is great!
One think that I have yet to be explained is the redirection from subshell in this manner:
But the following works:
Why do I need two '<' in this construct?
Hi,
Can the cd command be invoked using pipes???
My actual question is slightly different. I am trying to run an executable from different folders and the path of these folders are obtained dynamically from the front end. Is there a way in which i can actually run the executable... (2 Replies)
I'm investigating strange behaviour on two boxes (Sun OS 5.10 and AIX 5.1) in ksh
have used $? to get exit codes returned:-
137 and 34
where can I find what these mean?
thank you (1 Reply)
Hi everybody, I'm writing to know what the following event stands for. I know that the following event is about a "su to root" action but I don't have any Idea about what action could rise this message. For example If an acction performed by the root crontab, a sudo command or something like that.... (1 Reply)
Hi,
thanks for b4. can anyone tell me why following not working:
noUsers=$(who | cut -d" " -f1 | wc -l)
What i'm trying to do is get a list of logged on users and pass it to 'wc -l' and store the output to a variable. Any ideas? (1 Reply)
im trying to figure out how to do the following:
using pipes to combine grep and find commands to print all lines in files that start with the letter f in the current directory that contain the word "test" for example?
again using pipes to combine grep and find command, how can I print all... (1 Reply)
Hello all, I am trying to learn more about programming Unix pipes in C.
I have created a pipe that does od -bc < myfile | head
Now, I am trying to create od -bc < myfile | head | wc
Here is my code, and I know I might be off, thats why I am here so I can get some clarification.
#include... (1 Reply)
Hi all,
I was trying see some CPU utilization of a Red hat Linux machine using 'top' command.
Any way I got high level idea from the out puts,
but when I observed the following line:
Cpu(s): 7.4%us, 0.5%sy, 0.0%ni, 91.6%id, 0.4%wa, 0.0%hi, 0.1%si, 0.0%st
I couldn't make out what... (2 Replies)
Discussion started by: a99u
2 Replies
LEARN ABOUT DEBIAN
perlio::via::dynamic
dynamic(3pm) User Contributed Perl Documentation dynamic(3pm)NAME
PerlIO::via::dynamic - dynamic PerlIO layers
SYNOPSIS
open $fh, $fname;
$p = PerlIO::via::dynamic->new
(translate =>
sub { $_[1] =~ s/$Filename[:ws-./\]*$/$Filename: $fname$/e},
untranslate =>
sub { $_[1] =~ s/$Filename[:ws-./\]*$/$Filename$/});
$p->via ($fh);
binmode $fh, $p->via; # deprecated
DESCRIPTION
"PerlIO::via::dynamic" is used for creating dynamic PerlIO layers. It is useful when the behavior or the layer depends on variables. You
should not use this module as via layer directly (ie :via(dynamic)).
Use the constructor to create new layers, with two arguments: translate and untranslate. Then use "$p-"via ($fh)> to wrap the handle. Once
<$fh> is destroyed, the temporary namespace for the IO layer will be removed.
Note that PerlIO::via::dynamic uses the scalar fields to reference to the object representing the dynamic namespace.
OPTIONS
translate
A function that translate buffer upon write.
untranslate
A function that translate buffer upon read.
use_read
Use "READ" instead of "FILL" for the layer. Useful when caller expect exact amount of data from read, and the "untranslate" function
might return different length.
By default "PerlIO::via::dynamic" creates line-based layer to make "translate" implementation easier.
AUTHORS
Chia-liang Kao <clkao@clkao.org>
COPYRIGHT
Copyright 2004 by Chia-liang Kao <clkao@clkao.org>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
perl v5.8.8 2006-03-06 dynamic(3pm)