All,
I have a field in a comma seperated file with hundreds of lines and about 20 columns and I wish to remove all numbers after the decimal point in field 4 on each line and output the rest to another file or write it back to itself.
File is like this
20070126, 123.0, GBP, 1234.5678,... (9 Replies)
hi, guys. I have a question.
If I have a long string like this:
8.0K:/home/test/brownj
How can I get a substring which starts from the last slash to the end of the string, so in this case, it will be brownj
Thank you very much for you time in advance
-Keyang (4 Replies)
How can i break a text file into parts that occur between a specific pattern?
I have text file having various xml many tags like which starts with the tag "<?xml version="1.0" encoding="utf-8"?>" . I have to break the whole file into several xmls by looking for the above pattern.
All the... (9 Replies)
Hi,
I want to truncate a string variable, returned in the script. In perl I used the below and it worked.
BRNo=BR12345
$BR = substr($BRNo, 2, 7)
How can I do it in sh.
Thanks ! (8 Replies)
Hello. I need help with copying part of a file structure to another directory while still keeping the structure. For example look below:
../folder1/sub1/txt.txt
../folder1/sub2/pic.png
../folder2/sub1/pic.png
../folder2/sub2/txt.txt
So in this I would like to copy only the directories and... (3 Replies)
Hi,
I have a file with the following structure.
XXXXX...........
YYYYY...........
.................
..................
ZZZZZZ......
qwerty_start..............
..................
.................
..................
querty_end................
.............................. (3 Replies)
From strings stored in variables, I need to isolate and use the first numerical value contained within them. I will need to know how to produce an integer as well as a floating point decimal. It needs to work on any string regardless of what types of characters (if any) are preceding or following... (3 Replies)
Hi there,
I have an output from a command like this
# ypcat -k netgroup.byuser| grep steven
steven.* users_main,users_sysadmin,users_global,users_backup_team
and wanted to pull the 'users' netgroups returned into a perl array, that will look like this
users_main... (2 Replies)
Hello:
I have a large file which contains lines like the following:
1/t123ab, &Xx:1:1234:12345:123456@ABCDEFG... at -$100.00%
/t is a tab, spaces are as indicated
the string "&Xx:1:1234:12345:123456$ABCDEFG..." has a slightly variable number of numbers and letters, but it always starts... (9 Replies)
Hi all,
I desperately need a small script which deletes everything in a particular .txt file when "Abs = {" appears till "},", and also when "B-1 = {" appears till "},"
I would like all the text in between of those instances to be deleted, however, other text to be unedited (kept as it is).... (12 Replies)
Discussion started by: c_lady
12 Replies
LEARN ABOUT OSX
io::string
String(3) User Contributed Perl Documentation String(3)NAME
IO::String - Emulate file interface for in-core strings
SYNOPSIS
use IO::String;
$io = IO::String->new;
$io = IO::String->new($var);
tie *IO, 'IO::String';
# read data
<$io>;
$io->getline;
read($io, $buf, 100);
# write data
print $io "string
";
$io->print(@data);
syswrite($io, $buf, 100);
select $io;
printf "Some text %s
", $str;
# seek
$pos = $io->getpos;
$io->setpos(0); # rewind
$io->seek(-30, -1);
seek($io, 0, 0);
DESCRIPTION
The "IO::String" module provides the "IO::File" interface for in-core strings. An "IO::String" object can be attached to a string, and
makes it possible to use the normal file operations for reading or writing data, as well as for seeking to various locations of the string.
This is useful when you want to use a library module that only provides an interface to file handles on data that you have in a string
variable.
Note that perl-5.8 and better has built-in support for "in memory" files, which are set up by passing a reference instead of a filename to
the open() call. The reason for using this module is that it makes the code backwards compatible with older versions of Perl.
The "IO::String" module provides an interface compatible with "IO::File" as distributed with IO-1.20, but the following methods are not
available: new_from_fd, fdopen, format_write, format_page_number, format_lines_per_page, format_lines_left, format_name, format_top_name.
The following methods are specific to the "IO::String" class:
$io = IO::String->new
$io = IO::String->new( $string )
The constructor returns a newly-created "IO::String" object. It takes an optional argument, which is the string to read from or write
into. If no $string argument is given, then an internal buffer (initially empty) is allocated.
The "IO::String" object returned is tied to itself. This means that you can use most Perl I/O built-ins on it too: readline, <>, getc,
print, printf, syswrite, sysread, close.
$io->open
$io->open( $string )
Attaches an existing IO::String object to some other $string, or allocates a new internal buffer (if no argument is given). The
position is reset to 0.
$io->string_ref
Returns a reference to the string that is attached to the "IO::String" object. Most useful when you let the "IO::String" create an
internal buffer to write into.
$io->pad
$io->pad( $char )
Specifies the padding to use if the string is extended by either the seek() or truncate() methods. It is a single character and
defaults to "