Programming :: Nested Loop Using A Counter To Increment Array Output?
Feb 2, 2011
I work in a simulations environment. I'm trying to write a bash script that will read fields from a .csv file into an array, the first field being an identifiyng number and the second field being a corresponding url. There are about 1600 of these number/url combinations in the .csv file that i'm reading from. Once that is done i want it to parse a text file and match the number, when it has a match i want it to enter the corresponding url into a particular line in the text file. The script I have written (with the help of the people on this forum a while back) does this well, but now I have a lot more data to parse. I think the script itself is explanatory enough to see what i'm doing. What i would like to do is cut it down to one while loop nested inside another loop so that I don't have 1600 or so elif statements. I can't figure out how to increment the output of the array. for instance, the first cycle would find the number that matches ${record1[2]} and input the url stored in ${record1[3]}. the next cycle would match ${record1[4]} and input the url in ${record1[5]}, and so on, does that make sense? The code is below and a sample .csv and text file are attached.
How do I get this loop to stop on each increment? This script does work but I would like it to stop at each increment, remember what the value of $n is, then continue until it gets to 7. I have worked so hard on this. My brain is hurting now.
When I deal with an array in a function I con not access to the content of array in a for loop, but out of a for loop I can access to them! for example
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In a function when I send as parameter, in a for loop it prints the content of array and out of a for loop it prints the address of arr[i]
I need to know how to assign a result from a select. I am clueless on the sytax. I am trying this in bash. Maybe I am not assigning the array right. It gives me the whole row in the echo instead of just field a. How do I get fieldA = a in the select. Note script was stripped for security on database info but the syntax is same.
Code:
#!/bin/sh results="$(mysql --user ${DB_USER} -p${DB_PWD} ${DB_NAME} -Bse 'select a,b,c,d from tblMytable')" for rows in "${results[@]}" do fieldA=${rows[0]}; echo ${fieldA}; done
Program in CSay I have a char array of 1024 bytes called buf1.But I only want to print the chars in index 0 up to index 30. I know I could do this with a for loop. But is there any other way? What about maybe storing from 31-1024 to another char array say buf2 with strcpy and somehow popping 31+ out of the buf1 char array?
I'm reading "OReilly Learning Perl 5th Edition", and there are such words:Code:You can use an array element like $fred[2] in every place? where you could use any other scalavariable like $fred.At the bottom of the page, it explains the ? like this:Code:The most notable exception is that the control variable of a foreach loop, which you?ll see later in this chapter, must be a simple scalar.Since Perl has the save-and-restore mechanism for the control variable, why an array element can't be used as the control variable
Am new in bash scripting, presently I have 2 files and i need to create a file reading from these 2 files. I was trying to work with 2 for loops, but I can see like once its executing 1st outer loop then all inner loop, then next outer loop+ all inner loop. How can i get result like 1 outer loop, 1 inner loop then 2 outer loop,2 inner loop etc. Below is my prog
#!/bin/bash rm d for i in `cat a` do echo "dn:$i >> d for j in `cat b`
PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869; PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915; PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869; PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915; PU1723,3423; #this line is ignored to short
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What I'm trying to do is while true, cut each line from file that begins with PU and thats longer than 12 characters and write to a increasing numbered file for each line. Stating with object1 etc.
i will be quick, im trying to send a mysql query output into an array ie:
Code: declare -a HD HD=`echo "USE db; SELECT uid FROM user" | mysql -u $login -p$pwd -h $dbhost -B` echo ${#HD} those vars in mysql connection are previously and correctly assigned. but got an error
I'm converting pages in PDF to images in the following way: convert file.pdf out.jpg In this way I get in the current dir files with these names: out-0.jpg (first page), out-1.jpg (second page), out-2.jpg (third page) and so on. You can see the increment counter begins at 0. Can it be done to begin at 1, so I would get these names: out-1.jpg (first page), out-2.jpg (second page), out-3.jpg (third page)?
I'm trying to remember how to use the output of a nested Bash builtin call. So `which prog` gives me the path to the program, i'm interested in. Then I would like to get the directory path leading to that program and plug it into 'cd', so i end up in the directory containing the program.
Is there anyway in Linux that can achieve atomic increment/decrement for an integer variable without being interrupted? It means that the thread should not chance for other thread to run until theincrement/decrement is completed.
Can one of you point me towards a comprehensive print function tutorial in perl? I was under the impression that everything within quotes will get interpolated - but I am running into exceptions where it is not desirable to run some varaibles under quotes.
Code: std :: map <QString, std :: vector <std :: pair <QString, QString> > > configFileDataVector; How should I insert data in it? All the examples which I have looked up in Google are of plain maps!
I've only gone into the first case statement of the first switch and I am trying to get out of it but the break statement I added doesn't seem to have any effect and it just goes on to the next case instead of exiting the switch.
Code: import java.util.*; import javax.swing.*; public class A2 { public static void main(String[] args) { double gross_Pay; int payment_Method; final double salary_Pay = 1000.00; final double hourly_Pay = 25.00; double overtime1 = 20.00; double overtime2 = 30.00; .....
Unfortunately, the second grep is greedy swallowing everything up to the last </ul> close tag. (The desired result is 2.) Speed is an issue as I will be searching through 350,000 files.
Code: tupe=("File",("Open","Open a file"),"Edit",("Cut","Cut a file"),("Paste","Paste a file"),"About",("About","About the program")) menutitle="" menupos=0 for items in tupe: if type(items)==str:
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I'm trying to understand how to make "File" be the parent information for "Open","Open a file" and "Edit" to be the parent of "Cut, Cut a file" and "Paste", "paste a file". Does anyone have a suggestion for accessing the a nested tuple in this manner? The above code does not quite do what I want it to. The above code is for visual purposes, but I'm learning how to refactor for wx.python.
I am posting this just for the sake of curiosity. I am trying to feed a while loop structure with a command output, but using the bash built-in I get the error "ambiguous redirect":
