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Top Forums Shell Programming and Scripting Reading two lines in a while loop and combining the lines Post 302626555 by valente on Thursday 19th of April 2012 12:08:44 PM
Old 04-19-2012
Reading two lines in a while loop and combining the lines

Dear all,
I have a file like this:
imput
Code:
scaffold_0 1
scaffold_0 10000
scaffold_0 20000
scaffold_0 25000
scaffold_1 1
scaffold_1 10000
scaffold_1 20000
scaffold_1 23283

and I want the output like this:
Code:
scaffold_0 1         scaffold_0 10000
scaffold_0 10000 scaffold_0 20000
scaffold_0 20000 scaffold_0 25000
scaffold_0 25000 scaffold_1 1
scaffold_1 1         scaffold_1 10000
scaffold_1 10000 scaffold_1 20000
scaffold_1 20000 scaffold_1 23283

NOTE: I want the columns separated by tab

In other words, I want to combine
line 1 with line 2
line 2 with line3
line 3 with line4
....

I have this script:
Code:
while read line1
do
    read line2
    echo $line1 $line2
done < imput

But the results is:
Code:
scaffold_0 1         scaffold_0 10000
scaffold_0 20000 scaffold_0 25000
scaffold_1 1         scaffold_1 10000
scaffold_1 20000 scaffold_1 23283

so the script read line 1 and line 2, combine them, but do not follow reading the line 2 and combining with line 3. The script like jump the line 2 and follow the combination of line 3 and line 4 and again jump the next line (line 4).
How can I fix this script?

Best regards.
Moderator's Comments:
Mod Comment How to use code tags

Last edited by Scrutinizer; 04-19-2012 at 01:16 PM..
 

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Locale::Script(3pm)					 Perl Programmers Reference Guide				       Locale::Script(3pm)

NAME
Locale::Script - standard codes for script identification SYNOPSIS
use Locale::Script; $script = code2script('phnx'); # 'Phoenician' $code = script2code('Phoenician'); # 'Phnx' $code = script2code('Phoenician', LOCALE_CODE_NUMERIC); # 115 @codes = all_script_codes(); @scripts = all_script_names(); DESCRIPTION
The "Locale::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924 four-letter codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying scripts. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $script = code2script('phnx','alpha'); $script = code2script('phnx',LOCALE_SCRIPT_ALPHA); The codesets currently supported are: alpha, LOCALE_SCRIPT_ALPHA This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician. It also includes additions to this set included in the IANA language registry. The Zxxx, Zyyy, and Zzzz codes are not used. This is the default code set. num, LOCALE_SCRIPT_NUMERIC This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician. ROUTINES
code2script ( CODE [,CODESET] ) script2code ( NAME [,CODESET] ) script_code2code ( CODE ,CODESET ,CODESET2 ) all_script_codes ( [CODESET] ) all_script_names ( [CODESET] ) Locale::Script::rename_script ( CODE ,NEW_NAME [,CODESET] ) Locale::Script::add_script ( CODE ,NAME [,CODESET] ) Locale::Script::delete_script ( CODE [,CODESET] ) Locale::Script::add_script_alias ( NAME ,NEW_NAME ) Locale::Script::delete_script_alias ( NAME ) Locale::Script::rename_script_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Script::add_script_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Script::delete_script_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.unicode.org/iso15924/ Home page for ISO 15924. http://www.iana.org/assignments/language-subtag-registry The IANA language subtag registry. AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 1997-2001 Canon Research Centre Europe (CRE). Copyright (c) 2001-2010 Neil Bowers Copyright (c) 2010-2013 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2013-11-04 Locale::Script(3pm)
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