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Top Forums Shell Programming and Scripting Find all lines in file such that each word on that line appears in at least n lines of the file Post 302999219 by RudiC on Thursday 15th of June 2017 10:53:02 AM
Old 06-15-2017
I'm certain Don Cragun will accept the apologies. The forum maintainers' attitude is less to not to become useless - people in here REALLY like to help with also minor problems - but to keep up the quality of IT education. If a student fills in the homework form including institution, course and professor, s/he will be helped to develop in the right direction and find a solution of his/her own; c.f. https://www.unix.com/homework-and-coursework-questions/. By the way, vague comments on a person's company like "chemical" or "administration" would have sufficed, or even you telling us you're a hobbyist.

Back to your problem. Outputting the entire line that satisfies a condition means either keep ALL lines in memory (demanding for BIG files) or run through the input file twice - once for counting, once for printing. This is the approach in here:
Code:
awk 'NR == FNR {CNT[$1]++; CNT[$3]++;CNT[$5]++; CNT[$7]++; next} CNT[$1] > 1 && CNT[$3] > 1 && CNT[$5] > 1 && CNT[$7] > 1 ' file file
5^5 + 18^2 = 15^3 + 74^1    (3125, 324, 3375, 74)
5^5 + 32^2 = 8^4 + 53^1    (3125, 1024, 4096, 53)
5^5 + 60^1 = 14^3 + 21^2    (3125, 60, 2744, 441)

For increasing the count limit, set all the 1 s to 3 for the four comparisons in the second part.
And, yes, you're right: awk is a very powerful tool for text file analyses...
This User Gave Thanks to RudiC For This Post:
 

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URLCODING(3)						 libbash urlcoding Library Manual					      URLCODING(3)

NAME
urlcoding -- a Libbash library for encoding and decoding URL's. SYNOPSIS
urlEncodeString [-l] <STRING> urlEncodeFile [-l] <FILE> urlEncodeStream [-l] urlDecodeString <STRING> urlDecodeFile <FILENAME> urlDecodeStream DESCRIPTION
urlcoding is a collection of functions that convert ASCII-text to standard URL's and vice-versa. The AWK code used is based on code by Heiner Steven <heiner.steven@odn.de> The function list: urlEncodeString Creates a URL from an ASCII string urlEncodeFile Converts a file into URL-valid text urlEncodeStream Converts standard input into URL-valid text urlDecodeString Converts a URL-encoded text back to a plain-text form urlDecodeFile Coverts URL-encoded text in a file back to plain text urlDecodeStream Converts URL-encoded standard input to text Detailed interface description follows. The [-l] option for the encoding functions should be used when line-feed characters (' ') are to be encoded as well. All functions print the results of their conversions to standard output. The exit status of all functions is that of the command 'awk', with '0' for success FUNCTIONS DESCRIPTIONS
urlEncodeString [-l] <STRING> Converts STRING - a string of ASCII characters - to URL. urlEncodeFile [-l] <FILE> Coverts FILE of URL-encoded text to plain text urlEncodeStream [-l] Converts text from standard input to URL-text. urlDecodeString <STRING> Converts URL-encoded string STRING back to text. urlDecodeFile <FILENAME> Converts the URL-encoded text in FILE to plain text. urlDecodeStream Converts the URL-encoded text from standard input to plain-text AUTHORS
Alon Keren <alon.keren@gmail.com> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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