Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reading in two lines at once from a text file
Top Forums Shell Programming and Scripting Reading in two lines at once from a text file Post 302793787 by Scrutinizer on Saturday 13th of April 2013 06:35:12 PM
Old 04-13-2013
I am not sure I understand what you are after, but I suppose you could try doing something like this to compare the calculated result with what is in the last column of every second file:

Code:
#!/bin/bash
while read -a P && read -a S
do
  t=0
  for((i=0; i<${#P[@]}; i++)); do
    (( t -= P[i] * S[i] ))
  done
  printf "calculated: %d, file: %d\n" $t ${S[i]}
done < file

awk:
Code:
awk '{split($0,P); getline; t=0; for(i=1; i<NF; i++) t-=P[i]*$i; printf "calculated: %d, file: %d\n",t,$NF}'  file

 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Reading lines within a Unix file.

I have a file that has a list of numbers in it. Each line has a different number. I am trying to create some sort of loop within a script that will pick the numbers up on lines 1 and 2 and then put those figures into the script. It then goes through the process then loops back and reads lines 2 and... (5 Replies)
Discussion started by: mariner
5 Replies

2. UNIX for Dummies Questions & Answers

skip reading certain lines in a file

How can I exclude reading lines in a file that contains the following: filesystem:/home/pach/liv_patches 128005120 88456640 37270758 71% /home/patches That is, all lines that contain and begins with filesystem: should not be processed/read from a file (5 Replies)
Discussion started by: paulsew
5 Replies

3. UNIX for Dummies Questions & Answers

Help with reading text file

How can i have a while loop as follows while read inputline do <task> done < name_list and also store the values (delimited) on each line to temp variables so as to print them on screen as follows while read inputline do set name | cut -d "," -f1 name_list # #i know this is not... (1 Reply)
Discussion started by: bilal05
1 Replies

4. Shell Programming and Scripting

reading alternate lines of a file

hi, i have 2 files. file1: 1 2 3 4 5 6 file2: a b c d e f g h i (5 Replies)
Discussion started by: vidyaj
5 Replies

5. Shell Programming and Scripting

skip lines while reading a file

Hi Experts, I am tryin to read a file and while doing so i need to skip the lines which start with a hash (#) char. I thought of using a goto command but a lot of guys on this site say its not the good way to program. Moreover I am using a ksh shell which deos not support goto command. ... (4 Replies)
Discussion started by: bankimmehta
4 Replies

6. Shell Programming and Scripting

Regarding reading lines into a new file

Hi all, I jut use a loop to read lines from the user and redirect it to a file. echo "Enter the line" while read -r LINE do echo $LINE >> FILE if ;then break fi done input app... (1 Reply)
Discussion started by: Ananthdoss
1 Replies

7. UNIX for Dummies Questions & Answers

Extracting lines from a text file based on another text file with line numbers

Hi, I am trying to extract lines from a text file given a text file containing line numbers to be extracted from the first file. How do I go about doing this? Thanks! (1 Reply)
Discussion started by: evelibertine
1 Replies

8. Shell Programming and Scripting

Reading multiple lines in a file

Hello, I am new in shell scripting. I need help regarding following. I have 4 files generated by backups daily. I have stored the names of these 4 files into one file. i.e I have 4 files names as a, b, c & d and these names have been put into one file abcd.txt. Now I want to cat each file in... (7 Replies)
Discussion started by: Ali Sarwar
7 Replies

9. Programming

How to write in other language in text/xml file by reading english text/xml file using C++?

Hello Team, I have 2 files.one contains english text and another contains Japanese. so i have to read english text and replace the text with Japanesh text in third file. Basically, I need a help to write japanese language in text/xml file.I heard wstring does this.Not sure how do i write... (2 Replies)
Discussion started by: SA_Palani
2 Replies

10. Shell Programming and Scripting

Match text to lines in a file, iterate backwards until text or text substring matches, print to file

hi all, trying this using shell/bash with sed/awk/grep I have two files, one containing one column, the other containing multiple columns (comma delimited). file1.txt abc12345 def12345 ghi54321 ... file2.txt abc1,text1,texta abc,text2,textb def123,text3,textc gh,text4,textd... (6 Replies)
Discussion started by: shogun1970
6 Replies

LEARN ABOUT PHP

db2_field_num

DB2_FIELD_NUM(3)							 1							  DB2_FIELD_NUM(3)

db2_field_num - Returns the position of the named column in a result set

SYNOPSIS

       int db2_field_num (resource  $stmt, mixed  $column)

DESCRIPTION

	Returns the position of the named column in a result set.

PARAMETERS

	      o $stmt
		- Specifies a statement resource containing a result set.

	      o $column
		-  Specifies  the  column in the result set. This can either be an integer representing the 0-indexed position of the column, or a
		string containing the name of the column.

RETURN VALUES

	Returns an integer containing the 0-indexed position of the named column in the result set. If the specified column does not exist in  the
       result set, db2_field_num(3) returns FALSE.

SEE ALSO

       db2_field_display_size(3), db2_field_name(3), db2_field_precision(3), db2_field_scale(3), db2_field_type(3), db2_field_width(3).

PHP Documentation Group 													  DB2_FIELD_NUM(3)
All times are GMT -4. The time now is 02:37 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy