Scrutinizer is correct, but as there are always several ways in Unix to do something, you could do it with the exec too, if you use ksh (note that this won't work in bash, because bash doesn't have the print command):
Code:
exec 3> /some/output/file # open the file as I/O channel 3 and clear
# its contents if it already exists
print -u3 "some text" # print some text to channel 3
print -u3 "something else" # same
...
exec 3>&- # close I/O-channel 3
This way you won't have to take care of the first ">" and subsequent ">>" redirections (if you mistakenly use ">" it will clear the file) and you will not have to repeat the output files name over and over again.
You could even influence the content of your output file with some program logic in the script - something the here-document provides little support for. For instance, the following would not be possible with a here-doc:
Code:
exec 3> /some/output/file
print -u3 "first line"
print -u3 "second line"
if [ <some_criteria> ] ; then
print -u3 "----Optional line------"
fi
print -u3 "third line"
exec 3>&-
In exchange for helping you I'd like to ask you to learn about I/O channels (file descriptors) and redirection in Unix and how to use these. You might want to read this thread as a starter.
Hello. I have one file that is a collection of discarded emails. Each email is it's own section with each section beginning with the same header (ie 'Another Email' ). I want to traverse through the file and every time I find the header ('Another Email') I then want to pick out the 'To:' line... (5 Replies)
I need to write value of variable $version at a particular line in a text file.
Line number is determined by another variable &line......I don't know how to do it in shell script ... (2 Replies)
I need to put together a RAID1 file server for use by Windoze systems. I've built zillions of windows systems from components. I was a HPUX SE for a long time at HP, but have been out of the game for years.
I've got an old workhorse mobo FIC PA-2013 with a 450 MHz K6 III+ I could use, but I'd... (2 Replies)
Hi,
I have two text files. Need to create a third text file extracting specific data from first two existing files..
Text File 1: Format contains:
SQL*Loader: Release 10.2.0.1.0 - Production on Wed Aug 4 21:06:34 2010
some text ............so on...and somwhere text like:
Record 1:... (1 Reply)
Hi,
I know the code to write a piece of text to the end of a given text file is
echo $text >> filename.txt
I would like to know how to write a piece of text to a file using shell, but the file name isn't given. I want it to write to whatever text file is currently open. Not to all text files... (2 Replies)
I am having a file, around 500 lines. which contains one letter words, two letters words,...and so on(up to 15 letter words and words are not seprated by line). I need to compare all 1 letter words with 3,4,5 and 6 letters word, all 2 letters words with 2,3,4 and 5 letters words and all 3 letters... (3 Replies)
Hi,
I am trying to populate an array with data from a text file. I have a working method using awk but it is too slow and inefficent. See below.
The text file has 70,000 lines. As awk is a line editor it reads each line of the file until it gets to the required line and then processes it.... (3 Replies)
I have a list of files defined in a single file , one on each line.(No.of files may wary each time)
eg. content of ETL_LOOKUP.dat
/data/project/randomname
/data/project/ramname
/data/project/raname
/data/project/radomname
/data/project/raame
/data/project/andomname
size of these... (5 Replies)
I have one array SPLNO with approx 10k numbers.Now i want to search the subscriber number from MDN.TXT file (containing approx 1.5 lac record)from the array.if subscriber number found in array it will perform below operation.my issue is that it's taking more time because for one number it's search... (6 Replies)
Shell: sh/bash
OS: Linux (all unix flavors)
Suppose i have a variable with this content:
ArgZ='
import os
import sys
MySpecialpath = os.path.abspath(sys.argv)
#
'
ArgZB='#REGEN
#REGEN
#REGEN
'
I want to add this text to a file/script, only under the following conditions:
1. ... (1 Reply)
Discussion started by: SkySmart
1 Replies
LEARN ABOUT DEBIAN
text::micromason::executecache
MicroMason::ExecuteCache(3pm) User Contributed Perl Documentation MicroMason::ExecuteCache(3pm)NAME
Text::MicroMason::ExecuteCache - Use a Cache for Template Results
SYNOPSIS
Instead of using this class directly, pass its name to be mixed in:
use Text::MicroMason;
my $mason = Text::MicroMason->new( -ExecuteCache );
Use the standard compile method to parse a template into a subroutine:
my $subref = $mason->compile( text=>$template );
print $subref->( 'name'=>'Dave' );
The template does not have to be interpreted the second time because the results are cached:
print $subref->( 'name'=>'Dave' ); # fast second time
When run with different arguments, the template is re-interpreted and the results stored:
print $subref->( 'name'=>'Bob' ); # first time for Bob
print $subref->( 'name'=>'Bob' ); # fast second time for Bob
DESCRIPTION
Caches the output of templates.
Note that you should not use this feature if your template code interacts with any external state, such as making changes to an external
data source or obtaining values that will change in the future. (However, you can still use the caching provided by
Text::MicroMason::CompileCache.)
Public Methods
compile()
Wraps each template that is compiled into a Perl subroutine in a memoizing closure.
Supported Attributes
execute_cache
Defaults to an instance of Text::MicroMason::Cache::Simple.
This module uses a simple cache interface that is widely supported: the only methods required are "get($key)" and "set($key, $value)". You
can use the simple cache classes provided in the Text::MicroMason::Cache:: namespace, or select other caching modules on CPAN that support
the interface described in Cache::Cache.
SEE ALSO
For an overview of this templating framework, see Text::MicroMason.
This is a mixin class intended for use with Text::MicroMason::Base.
For distribution, installation, support, copyright and license information, see Text::MicroMason::Docs::ReadMe.
perl v5.10.1 2007-01-29 MicroMason::ExecuteCache(3pm)