Sponsored Content
Top Forums UNIX for Beginners Questions & Answers sed awk: split a large file to unique file names Post 302980154 by MadeInGermany on Wednesday 24th of August 2016 01:42:55 PM
Old 08-24-2016
I like the shell solution. It can become a little more I/O efficient (matters when the output files are written to a network file system):
Code:
p_col1=""
while read col1 rest
do
  if [ "$col1" != "$p_col1" ]
  then
    p_col1=$col1
    exec 3>"$col1".txt
  fi
  echo "$col1 $rest" >&3
done < Input_file
exec 3>&-

The input file must be sorted on col1 (otherwise: remove previous output files and append with exec 3>>"$col1".txt)

Last edited by MadeInGermany; 08-24-2016 at 04:42 PM.. Reason: Removed comment about awk - close() releases the file descriptors!
This User Gave Thanks to MadeInGermany For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Split large file and add header and footer to each file

I have one large file, after every 200 line i have to split the file and the add header and footer to each small file? It is possible to add different header and footer to each file? (1 Reply)
Discussion started by: ashish4422
1 Replies

2. UNIX for Dummies Questions & Answers

split a file with unique sets

This may sound like a trivial problem, but I still need some help: I have a file with ids and I want to split it 'n' ways (could be any number) into files: 1 1 1 2 2 3 3 4 5 5 Let's assume 'n' is 3, and we cannot have the same id in two different partitions. So the partitions may... (8 Replies)
Discussion started by: ChicagoBlues
8 Replies

3. Shell Programming and Scripting

extract unique pattern from large text file

Hi All, I am trying to extract data from a large text file , I want to extract lines which contains a five digit number followed by a hyphen , like 12345- , i tried with egrep ,eg : egrep "+" text.txt but which returns all the lines which contains any number of digits followed by hyhen ,... (19 Replies)
Discussion started by: shijujoe
19 Replies

4. Shell Programming and Scripting

Updating a line in a large csv file, with sed/awk?

I have an extremely large csv file that I need to search the second field, and upon matches update the last field... I can pull the line with awk.. but apparently you cant use awk to directly update the file? So im curious if I can use sed to do this... The good news is the field I want to... (5 Replies)
Discussion started by: trey85stang
5 Replies

5. UNIX for Dummies Questions & Answers

Get List of Unique File Names

I have a large directory of web pages. I am doing a search through the web pages using grep and would like to get a list of unique file names of search results. The following command works fine to give me a list of file names where term appears: grep -l term *.html However, since these are... (3 Replies)
Discussion started by: rjulich
3 Replies

6. 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

7. Shell Programming and Scripting

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: ... (2 Replies)
Discussion started by: cul8er
2 Replies

8. Shell Programming and Scripting

Change unique file names into new unique filenames

I have 84 files with the following names splitseqs.1, spliseqs.2 etc. and I want to change the .number to a unique filename. E.g. change splitseqs.1 into splitseqs.7114_1#24 and change spliseqs.2 into splitseqs.7067_2#4 So all the current file names are unique, so are the new file names.... (1 Reply)
Discussion started by: avonm
1 Replies

9. Shell Programming and Scripting

sed and awk not working on a large record file

Hi All, I have a very large single record file. abc;date||bcd;efg|......... pqr;stu||record_count;date when i do wc -l on this file it gives me "0" records, coz of missing line feed. my problem is there is an extra pipe that is coming at the end of this record like... (6 Replies)
Discussion started by: Gurkamal83
6 Replies

10. Linux

Split a large textfile (one file) into multiple file to base on ^L

Hi, Anyone can help, I have a large textfile (one file), and I need to split into multiple file to break each file into ^L. My textfile ========== abc company abc address abc contact ^L my company my address my contact my skills ^L your company your address ========== (3 Replies)
Discussion started by: fspalero
3 Replies
PYP(1)							      General Commands Manual							    PYP(1)

NAME
pyp - The Pyed Piper: A Modern Python Alternative to awk, sed and Other Unix Text Manipulation Utilities SYNOPSIS
pyp [options] files ... DESCRIPTION
pyp, the Pyed Piper, is a command line tool for text manipulation. It is similar to awk and sed in functionality, but its subcommands are Python based, and thus more familiar to many programmers. It can operate both on a per-line base and on the complete input stream. Different features can be pipelined in a single command by using the pipe character familiar from shell commands. pyp backs up its input for reruns with modified commands, and can save commands as macros. On the downside, the rerun feature makes it unsuitable for continuous pipe operation. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. For a complete description, use --manual. -h, --help Show this help message and exit. -m, --manual Prints out extended help. -l, --macro_list Lists all available macros. -s MACRO_SAVE_NAME, --macro_save=MACRO_SAVE_NAME Saves current command as macro. use "#" for adding comments EXAMPLE: pyp -s "great_macro # prints first letter" "p[1]". -f MACRO_FIND_NAME, --macro_find=MACRO_FIND_NAME Searches for macros with keyword or user name. -d MACRO_DELETE_NAME, --macro_delete=MACRO_DELETE_NAME Deletes specified public macro. -g, --macro_group Specify group macros for save and delete; default is user. -t TEXT_FILE, --text_file=TEXT_FILE Specify text file to load. For advanced users, you should typically cat a file into pyp. -x, --execute Execute all commands. -c, --turn_off_color Prints raw, uncolored output. -u, --unmodified_config Prints out generic PypCustom.py config file. -b BLANK_INPUTS, --blank_inputs=BLANK_INPUTS Generate this number of blank input lines; useful for generating numbered lists with variable 'n'. -n, --no_input Use with command that generates output with no input; same as --dummy_input 1. -k, --keep_false Print blank lines for lines that test as False. default is to filter out False lines from the output. -r, --rerun Rerun based on automatically cached data from the last run. Use this after executing "pyp", pasting input into the shell, and hitting CTRL-D. SEE ALSO
awk(1), grep(1), sed(1). AUTHOR
pyp was written by Toby Rosen <tobyrosen@gmail.com>. This manual page was written by Khalid El Fathi <khalid@elfathi.fr>, for the Debian project (and may be used by others). March 19, 2012 PYP(1)
All times are GMT -4. The time now is 06:03 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy