Sponsored Content
Top Forums Shell Programming and Scripting awk - function to return permutations of n items out of m Post 303028492 by stomp on Wednesday 9th of January 2019 12:46:00 PM
Old 01-09-2019
@Scrutinizer:
... a small fix (your variant does only use n elements of the list, not all)

Code:
awk -v n=3 -v inp="a,b,c,d,e" '
  function perm(p,s,    i) {
   for(i=1;i<=c;i++)
     if(p==1)
       printf "%s%s\n",s,A[i]
      else
        perm(p-1,s A[i]" ")
  }
 
  BEGIN {
    c=split(inp,A,/,/)
    perm(n)
  }
'


Last edited by stomp; 01-10-2019 at 04:52 AM..
This User Gave Thanks to stomp For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Return an array of strings from user defined function in awk

Hello Friends, Is it possible to return an array from a user defined function in awk ? example: gawk ' BEGIN{} { catch_line = my_function(i) print catch_line print catch_line print catch_line } function my_function(i) { print "echo" line= "awk" line= "gawk"... (2 Replies)
Discussion started by: user_prady
2 Replies

2. Shell Programming and Scripting

Function's return value used inside awk

I have a file with the record of person: cat > $TMP/record.txt John Torres M Single 102353 Address Mark Santos M Maried 103001 Address Carla Maria F Maried 125653 Address #!/bin/ksh ManipulateID(){ ... return 0; ... #or return 1; } cat $TMP/record.txt | awk 'BEGIN {printf... (4 Replies)
Discussion started by: Orbix
4 Replies

3. Shell Programming and Scripting

awk between items including items

OS=HP-UX ksh The following works, except I want to include the <start> and <end> in the output. awk -F '<start>' 'BEGIN{RS="<end>"; OFS="\n"; ORS=""} {print $2} somefile.log' The following work in bash but not in ksh sed -n '/^<start>/,/^<end>/{/LABEL$/!p}' somefile.log (4 Replies)
Discussion started by: Ikon
4 Replies

4. Shell Programming and Scripting

Return a value from called function to the calling function

I have two scripts. script1.sh looks -------------------------------- #!/bin/bash display() { echo "Welcome to Unix" } display ----------------------------- Script2.sh #!/bin/bash sh script1.sh //simply calling script1.sh ------------------------------ (1 Reply)
Discussion started by: mvictorvijayan
1 Replies

5. Shell Programming and Scripting

awk, help me - counting items and listing them

This is my first ever post... please help! :o I have two columns....here is part of the file... 12, 46798 6692, 46799 5710, ... (3 Replies)
Discussion started by: pelhabuan
3 Replies

6. Shell Programming and Scripting

Permutations with awk

Hello I have a very simple input file in which there are a list of numbers: 1 2 3 4 5 6 7 8 9 10 My actual dataset is about 200 lines long. I was wondering how to add different permutations of 3 numbers for all the numbers in the dataset. For example: 1+2+3; 3+5+7; 2+8+1; 9+3+4... (1 Reply)
Discussion started by: Rabu
1 Replies

7. UNIX for Dummies Questions & Answers

awk colon separated items

Hi, I need to filter my data based on items in column 23. Column 1 until column 23 are tab separated. This is how column 23 looks like: PRIMARY=<0/1:504:499,5:.:.:.:0.01:1:15:.> I want to extract lines if items 7 (separated by : ) in column 23 are more than 0.25 . In example above , item... (2 Replies)
Discussion started by: janshamsani
2 Replies

8. Shell Programming and Scripting

awk permutations and combinations

hello, I'm reading this thread, in which there is this code :awk ' function comb(v,i) { for(i in A) { delete A; if(length(A)) comb((v?v"+":x)i) else print v"+"i A; } } { A } END { comb(); } ' infilebut I can't understand where does v come... (5 Replies)
Discussion started by: daPeach
5 Replies

9. Shell Programming and Scripting

Return: can only `return' from a function or sourced script

Not sure where the problem is. I can run the script without any issue using the following command. . /opt/app/scripts/cdc_migration.sh But it fails with the below error when I try it this way /opt/app/scripts/cdc_migration.sh /opt/app/scripts/cdc_migration.sh: line 65: return: can only... (1 Reply)
Discussion started by: svajhala
1 Replies

10. Shell Programming and Scripting

Function - Make your function return an exit status

Hi All, Good Day, seeking for your assistance on how to not perform my 2nd, 3rd,4th etc.. function if my 1st function is in else condition. #Body function1() { if then echo "exist" else echo "not exist" } #if not exist in function1 my all other function will not proceed.... (4 Replies)
Discussion started by: meister29
4 Replies
INNCHECK(8)						      System Manager's Manual						       INNCHECK(8)

NAME
inncheck - check inn configuration and database files. SYNOPSIS
inncheck [ -a ] [ -v ] [ -pedantic ] [ -f ] [ -perm ] [ -noperm ] [ file=value | file ] DESCRIPTION
Inncheck examines various configuration files and databases and verifies things about them. Things verified depend on the file being checked, but generally are things like permissions, ownership, syntax errors in config files etc. Inncheck does not make changes to any files -- it just reports what it thinks may be wrong, and it is up to the operator to fix the prob- lem. The set of files checked may be restricted by using file or file=value arguments. For example, putting hosts.nntp causes only the hosts.nntp(5) file to be checked. Using hosts.nntp=/tmp/hosts.nntp.tst on the command line will cause inncheck to only verify the hosts.nntp file, and it will perform the checks on the file /tmp/hosts.nntp file instead of the default one. Valid values for file are: active control.ctl expire.ctl hosts.nntp inn.conf moderators newsfeeds overview.fmt nnrp.access nntpsend.ctl passwd.nntp OPTIONS
-a If any ``file'' value or ``file=value'' pairs (see below) are given, then normally only the files they refer to are checked. Use the ``-a'' flag to specify that all files should be checked regardless. In this case the form file=value will be the more useful. -v Use the ``-v'' option to get more verbose output. -pedantic Use the ``-pedantic option to get reports on things that are not necessarily wrong, but may indicate a bad configuration -- such as inn.conf(5) missing a key. -f Use the ``-f'' flag to have inncheck print the appropriate chown/chgrp/chmod command necessary to fix a problem that it reports. Any other output lines will be prefixed with a ``#'' character to make the output be valid input for a shell. Note that the ``-perm'' flag must be used as well when using this flag. -perm Inncheck checks all files for permission problems. If the ``-perm'' flag is used, then only the files specified by the file or file=value command line arguments will be checked for problems other than permission problems. -noperm To avoid doing any checking of file permissions or ownership, use the ``-noperm'' option. EXAMPLES
To have inncheck check all files for syntax and permission problems simply: inncheck To have inncheck check all files for permission problems and to verify the syntax of the active and hosts.nntp files do: inncheck -perm active hosts.nntp To have inncheck check the test newsfeeds file in /var/tmp/newsfeeds.testing, do: inncheck newsfeeds=/var/tmp/newsfeeds.testing To have inncheck check all the files as it normally does, but to specify a different location for the newsfeeds file, so: inncheck -a newsfeeds=/var/tmp/newsfeeds.testing BUGS
If the ``-f'' and ``-perm'' options are used together, along with -a or some ``file'' or ``file=value'' arguments that refer to a file with a syntax problem, then the output will no longer be valid input for a shell. HISTORY
Written by Brendan Kehoe <brendan@cygnus.com> and Rich Salz <rsalz@uunet.uu.net> This is revision 1.1, dated 1996/10/29. SEE ALSO
active(5), expire.ctl(5), history(5), hosts.nntp(5), inn.conf(5), newsfeeds(5) INNCHECK(8)
All times are GMT -4. The time now is 05:05 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy