Redirect contained in variable not expanded as expected
Hi all,
I have a selection of files that contain several commands that write to a file and are started as background processes similar to below.
I want to write a wrapper script that will read each file a line at a time, execute that line and store the PID for each line so that after a certain amount of time the processes can be killed.
I haven't implemented a full script for this but what I have written is here:
I was expecting that each line in the file would be read output and run. If I insert the commented line, an exact copy from the original file, it works fine. If I leave the variable in there then I get the following error:
Unexpected option '>'
It seems that when $line is expanded somehow the meaning of the redirection symbol is lost. Can anyone explain how $line is expanded and why the redirection is lost? As a secondary thing, is there a better way to achieve what I'm trying to do?
Please ask if anything isn't clear or I've missed relevant information. On that note, my shell is GNU bash, version 3.00.15(1)-release (x86_64-redhat-linux-gnu).
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for the below
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Discussion started by: port43
6 Replies
LEARN ABOUT MOJAVE
net::server::log::log::log4perl
Net::Server::Log::Log::Log4perl(3) User Contributed Perl Documentation Net::Server::Log::Log::Log4perl(3)NAME
Net::Server::Log::Log::Log4perl - log via Log4perl
SYNOPSIS
use base qw(Net::Server::PreFork);
__PACKAGE__->run(
log_file => 'Log::Log4perl',
log4perl_conf => '/path/to/my/log4perl.conf',
log4perl_logger => 'myapp',
);
DESCRIPTION
This module provides Log::Log4perl style logging to the Net::Server system.
CONFIGURATION
log_file
To begin using Log::Log4perl logging, simply set the Net::Server log_file configuration parameter to "Log::Log4perl".
If the magic name "Log::Log4perl" is used, all logging will be directed to the Log4perl system. If used, the "log4perl_conf",
"log4perl_poll", "log4perl_logger" may also be defined.
log4perl_conf
Only available if "log_file" is equal to "Log::Log4perl". This is the filename of the log4perl configuration file - see Log::Log4perl.
If this is not set, will die on startup. If the file is not readable, will die.
log4perl_poll
If set to a value, will initialise with Log::Log4perl::init_and_watch with this polling value. This can also be the string "HUP" to re-
read the log4perl_conf when a HUP signal is received. If set to 0, no polling is done. See Log::Log4perl for more details.
log4perl_logger
This is the facility name. Defaults to "Net::Server".
DEFAULT ARGUMENTS FOR Net::Server
The following arguments are available in the default "Net::Server" or "Net::Server::Single" modules. (Other personalities may use
additional parameters and may optionally not use parameters from the base class.)
Key Value Default
## log4perl parameters (if log_file eq Log::Log4perl)
log4perl_conf "filename" will die if not set
log4perl_poll number or HUP 0 (no polling)
log4perl_logger "name" "Net::Server"
METHODS
"initialize"
This method is called during the initilize_logging method of Net::Server. It returns a single code ref that will be stored under the
log_function property of the Net::Server object. That code ref takes log_level and message as arguments and calls the initialized
log4perl system.
LICENCE
Distributed under the same terms as Net::Server
perl v5.18.2 2013-01-09 Net::Server::Log::Log::Log4perl(3)