Selecting first nth rows by groups using AWK -


i have following file 4 fields. there 3 groups in field 2, , 4th field consists 0's , 1's.

the first field index.

i use awk following task

  1. select first 3 rows of group 1 (note group 1 has 2 rows). number of rows based on number of 1's found in 4th field times 3.

  2. select first 6 rows of group 2. number of rows based on number of 1's found in 4th field times 3.

  3. select first 9 rows of group 3. number of rows based on number of 1's found in 4th field times 3.

so 17 rows selected output file.

thank help.

input   1   1  tn1148 1 2   1  s52689 0 3   2  ta2081 1 4   2  ta2592 1 5   2  ta4011 0 6   2  ta4246 0 7   2  ta4275 0 8   2  tb0159 0 9   2  tb0392 0 10  3  tb0454 1 11  3  tb0496 1 12  3  tb1181 1 13  3  tc0027 0 14  3  tc1340 0 15  3  tc2247 0 16  3  tc3094 0 17  3  td0106 0 18  3  td1146 0 19  3  td1796 0 20  3  td3587 0  output    1  1  tn1148 1  2  1  s52689 0  3  2  ta2081 1  4  2  ta2592 1  5  2  ta4011 0  6  2  ta4246 0  7  2  ta4275 0  8  2  tb0159 0  10 3  tb0454 1  11 3  tb0496 1  12 3  tb1181 1  13 3  tc0027 0  14 3  tc1340 0  15 3  tc2247 0  16 3  tc3094 0  17 3  td0106 0  18 3  td1146 0

the key awk program pass input file in twice: once count how many rows want , once print them.

awk '     nr == fnr {wanted_rows[$2] += 3*$4; next}      --wanted_rows[$2] >= 0 {print} ' input_file.txt input_file.txt

Comments

Post a Comment

Popular posts from this blog

asp.net - repeatedly call AddImageUrl(url) to assemble pdf document -

i'm using abcpdf , i'm curious if can recursively call addimageurl() function assemble pdf document compile multiple urls? something like: int pagecount = 0; int theid = thedoc.addimageurl("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetochain(theid); } pagecount = thedoc.pagecount; console.writeline("1 document page count:" + pagecount); //flatten document (int = 1; <= pagecount; i++) { thedoc.pagenumber = i; thedoc.flatten(); } //now try again theid = thedoc.addimageurl("http://stackoverflow.com/questions/1980890/pdf-report-generation", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetoc...
Read more

java - Android recognize cell phone with keyboard or not? -

in android app, want detect user's device if device has keyboard(like motorola milestone) , show corresponding user interface. guys know how that? ! regards justicepenny http://developer.android.com/reference/android/content/res/configuration.html public int keyboard the kind of keyboard attached device. 1 of: keyboard_nokeys, keyboard_qwerty, keyboard_12key. that's it!
Read more

iphone - How would you achieve a LED Scrolling effect? -

how achieve led scrolling effect example below? led sign - led ticker emulator iphone , ipad http://img.skitch.com/20101201-rsfh4p1bajb1wp94k466pdpiuj.preview.jpg sometimes remunerates comment in other posts :) have put code you, should implement font '8pin matrix' realistic feeling. uilabel *label; - (void)viewdidload { [super viewdidload]; label = [[uilabel alloc]initwithframe:cgrectmake(10, 50, 300, 20)]; label.font = [uifont fontwithname:@"courier-bold" size:16.0]; label.backgroundcolor = [uicolor blackcolor]; label.textcolor = [uicolor greencolor]; label.linebreakmode = uilinebreakmodecharacterwrap; // otherwise "…" label.text = @"this led text scrolled "; // blanks space between [self.view addsubview:label]; [nstimer scheduledtimerwithtimeinterval:0.12f target:self selector:@selector(scrolllabel) use...
Read more