To separate strings by spaces you can use split() with a space as a delimiter.
Or in a more general sense, some whitespace characters. A quick example:
Code:
[testcn@bernardchan testcn]$ perl -e '@ary = split(/\s+/, "This is a space"); $, = "\n"; print @ary;'
This
is
a
space
Note that there are two space characters between 'This' and 'is', but treated as a single whitespace unit because the delimiter is any sequence of whitespace characters.
If you want something really like the C sscanf(), I found this module on CPAN:
I haven't used it before, so I have no idea whether it works. And first of all you need to know how to install it, as Perl does not ship this module with the distribution.
Trust me, regular expression is usually the "more proper" way to do string extraction in Perl. That's why perl has a printf() emulation but not a scanf() emulation in the basic function set.
HI
I need to read each line (test.txt) and store it in a array (@test)
How to do it in perl.
Suppose i have a file test.txt. I have to read each line of the test.txt file and store it in a array @test. How to do it in perl.
Regards
Harikrishna (3 Replies)
Hey,
I'm trying to read a file from a server. Simple file with some numbers.
Here is the code i'm running.
use Net::SSH::Perl::SSH1 ;
$scon = Net::SSH::Perl->new ("com123.sever.mydomain.com",(protocol=>'2',port=>'22',debug=>'true'));
$scon->login("user123","pass123");
open(FILE,... (9 Replies)
Hi,
I am new to perl.
I want to read from a file on the basis of some conditions..
I want to define parameters in a configuration file in such a manner like...
etc..
in my perl script, theer is a variable like this..
then i want to read values from first if block from the file... (1 Reply)
Hi, I am writting some perl scripts for daily backup process. In which I want to pass some data/referance from another txt file. Text file contains only one column and multiple rows. I want to pass this data to variables of another perl script.
e.g.
Refdoc.txt file contains data as:
perl1... (3 Replies)
Hi Everyone, I am very new to perl, but came across a situation wherein I have to read a c++ header file and write the datatype, its identifier and also the length to an excel file. There can be other header files, in the directory but I should browse through the file which has only "_mef:" string... (9 Replies)
Need perl script, data file will be csv format.
I have text file contains 2 colums.
Filename Foldernumber
aaaa 13455
bbbb 23465
cccc 26689
I have two location 1. files present and 2. folders present. I need to search for file and folder if folder... (3 Replies)
Hello,
I am trying to read from a file using PERL:confused, however i need to read specific portions of the file
the file goes like this
<Name 1
Hono
<Name 2
Jack
and so on
anyways i need to be able to write a program that ONLY opens the lines beginning with "<"? so it would... (2 Replies)
If a form's action is the following Perl script how do I make it print the entire contents of the file on the screen?
if(param())
{
my $uploadedFile = param('file');#in the html page 'file' is the value of the name attribute of the input
my $fh = upload($uploadedFile);
... (1 Reply)
Hi ,
I just write a simple function to read the file line by line.
But when I run it it says out of memory.
I am not sure about the root cause, Can someone help me out of this?
:D
#! /usr/bin/perl
use strict;
sub checkAPs{
my $NDPDir = "/home/eweiqqu/NCB/NDP_files/";
... (1 Reply)
Good morning, I appreciate any assistance that I can get from the monks out there. I am able to get this to work for me so that I can do a hostname lookup if I only specify one hostname in the script. What I want to do is have a file with hostnames and do lookups for each name in the file. Here is... (1 Reply)
Discussion started by: brianjb
1 Replies
LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)
02-17-2005
