Split File by Pattern with File Names in Source File... Awk?

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Split File by Pattern with File Names in Source File... Awk?
# 1  
Old 11-25-2011
Split File by Pattern with File Names in Source File... Awk?

Hi all,

I'm pretty new to Shell scripting and I need some help to split a source text file into multiple files. The source has a row with pattern where the file needs to be split, and the pattern row also contains the file name of the destination for that specific piece. Here is an example:


------ BEGIN SPLIT: file_abc.txt
------ BEGIN SPLIT: file_def.txt
------ BEGIN SPLIT: file_gh.txt

What I need as a result, are 3 files, with the specified names and with the following content (excluding the pattern line with the file name existing in the source file):




Is this something awk can help with? The source file can get pretty big and the script could generate 100-200 files after the split. I would appreciate any guidance or samples for this!

Thank you!
# 2  
Old 11-25-2011
A solution in Perl.

#! /usr/bin/perl -w
use strict;

my ($line, @x);
open SOURCE, "< source.txt";
for $line (<SOURCE>) {
    if ( $line =~ /BEGIN SPLIT/ ) {
        @x = split /:/, $line;
        $x[1] =~ s/\s+//g;
    else {
        open DEST, ">> $x[1]";
        print DEST "$line";
        close DEST;
close SOURCE;

# 3  
Old 11-25-2011
Works like a charm, thank you!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

sed awk: split a large file to unique file names

Dear Users, Appreciate your help if you could help me with splitting a large file > 1 million lines with sed or awk. below is the text in the file input file.txt scaffold1 928 929 C/T + scaffold1 942 943 G/C + scaffold1 959 960 C/T +... (6 Replies)
Discussion started by: kapr0001
6 Replies

2. Shell Programming and Scripting

Big pattern file matching within another pattern file in awk or shell

Hi I need to do a patten match between files . I am new to shell scripting and have come up with this so far. It take 50 seconds to process files of 2mb size . I need to tune this code as file size will be around 50mb and need to save time. Main issue is that I need to search the pattern from... (2 Replies)
Discussion started by: nitin_daharwal
2 Replies

3. UNIX for Dummies Questions & Answers

Split a file and give custom names

Hello, I want to split a file based on an input list file that contains the lines each split should have + a corresponding file name. #!/bin/sh # sed -n 'start_line_#,end_line_#p' my_input_file > lines_extracted_output_file while read a b c do sed -n '$a,$bp' myLarge.file > $c.split... (2 Replies)
Discussion started by: Gussifinknottle
2 Replies

4. Shell Programming and Scripting

How to Split a source file in specified format?

Requirement: Need to split a source file say a1.txt which can be of size upto 150 MB into 25 target files each with a max size of 25 MB along with the header line in each target file. NOTE: Few target files can be empty also ,but 25 files must be generated for 1 source file( I can expect upto... (4 Replies)
Discussion started by: mad_man12
4 Replies

5. Shell Programming and Scripting

How to split file into multiple files using awk based on 1 field in the file?

Good day all I need some helps, say that I have data like below, each field separated by a tab DATE NAME ADDRESS 15/7/2012 LX a.b.c 15/7/2012 LX1 a.b.c 16/7/2012 AB a.b.c 16/7/2012 AB2 a.b.c 15/7/2012 LX2 a.b.c... (2 Replies)
Discussion started by: alexyyw
2 Replies

6. Shell Programming and Scripting

Identify file name pattern in different file names

Hi, need help in recognizing the pattern of file name. For e.g. file name 1: <static file prefix>.<store cd>_<YYYYMMDD>.<ext> file name 2: <static file prefix>_<YYYYMMDD>.<ext> I want to know that there are 3 dots "." in the file name1 and one dot "." in file name2. How can I know... (3 Replies)
Discussion started by: dips_ag
3 Replies

7. Shell Programming and Scripting

How to split a data file into separate files with the file names depending upon a column's value?

Hi, I have a data file xyz.dat similar to the one given below, 2345|98|809||x|969|0 2345|98|809||y|0|537 2345|97|809||x|544|0 2345|97|809||y|0|651 9685|98|809||x|321|0 9685|98|809||y|0|357 9685|98|709||x|687|0 9685|98|709||y|0|234 2315|98|809||x|564|0 2315|98|809||y|0|537... (2 Replies)
Discussion started by: nithins007
2 Replies

8. Shell Programming and Scripting

extracting columns using pattern file from source file

Hi experts,Please help me for the below requirement. i have a source file.(lets say contains 50 columns). I am extarcting five columns from the source file by using pattern file. for example input file:--------a,b,c,d,"a,g","v b",s,koutputfile=======a,"a,g","v b",s,kThanks in advance subhendu (2 Replies)
Discussion started by: subhendu81
2 Replies

9. Shell Programming and Scripting

Split a file based on pattern in awk, grep, sed or perl

Hi All, Can someone please help me write a script for the following requirement in awk, grep, sed or perl. Buuuu xxx bbb Kmmmm rrr ssss uuuu Kwwww zzzz ccc Roooowwww eeee Bxxxx jjjj dddd Kuuuu eeeee nnnn Rpppp cccc vvvv cccc Rhhhhhhyyyy tttt Lhhhh rrrrrssssss Bffff mmmm iiiii Ktttt... (5 Replies)
Discussion started by: kumarn
5 Replies

10. UNIX for Dummies Questions & Answers

Split a file with no pattern -- Split, Csplit, Awk

I have gone through all the threads in the forum and tested out different things. I am trying to split a 3GB file into multiple files. Some files are even larger than this. For example: split -l 3000000 filename.txt This is very slow and it splits the file with 3 million records in each... (10 Replies)
Discussion started by: madhunk
10 Replies
Login or Register to Ask a Question

Featured Tech Videos