Programming :: Bash Calculate The Repeated Lines?

Jan 28, 2010

i have a sorted file with many repeated lines like this:



i need to calculated haw many times each line is repeated, for ex

1ujw 2
1ul1 1
1us7 5

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Programming :: Calculate Logarithm In Bash Script?

Dec 12, 2008

I want to calculate log in bash script. I searched but could not find any bash command to directly do it. I am also thinking to send the variable in C program, calculate in C and get the answer back in bash script.But I think it is a long process. as I have to do this

i) gcc -o log log.c

ii) ./log > log_result.txt

iii) then read the result from log_result.txt

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Programming :: List 10 Lines By Same In Bash?

Mar 30, 2010

I have a file witch I need to list 10 line by 10 lines with something like press enter to go on in between.
Well, the problem is that i have absolutely no idea on how to implement this.

Can you give me some points?

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Programming :: Bash There Will Be Empty Lines At The End Of The File?

Mar 26, 2011

Using awk I pull the first field of a random line from my datafile.myvar1=`awk -F" " 'NR=='$randline' {printf "%s", $1}' myfileThis works fine. The problem is there will be empty lines at the end of the file. Rather than using awkto filter out blank lines I would like to figure this out first.So I test $myvar1 for a blank string after setting $randline to one that I know is blank:test -z "$myvar1" && echo "true" || echo "false"But, this returns "false"? So the string is not zero length. Why? It's a tab-separated file. Is awk storing the tab with the $1 field or something.This is where I get headache. I try to echo my variable to see what it looks like.

echo "$myvar1"
outputs: nothing
echo "My variable is [$myvar1]"
outputs: [y variable is [

Why is the closing bracket at the beginning? What character could be stored in $myvar1 that would do such a thing and how did it get there?

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Programming :: Get Rid Of Unwanted Lines Without Grep -v In BASH?

Jun 9, 2009

I would like to know how I can get the ouput from the following dmidecode command in example 1 to look like example 2 without having to grep -v all the unwanted lines.Is there a way in awk or sed?Example 1

Processor Information
Socket Designation: Socket 1 CPU 1


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Programming :: Remove Extra New Lines (BASH)

Jul 15, 2010

I'm trying to search through some pdf files and I'm doing so by converting them to text files using pdftotext which is fine but I'm trying to get the number of occurrences in a paragraph of different words and it's adding a new line character at what it thinks is the right hand margin. I'm trying to remove all these singe new line characters but keep the doubles and I can't seem to work it out. i.e.

This is some text that has been broken.
Another paragraph.
This is some text that has been broken.
Another paragraph

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Programming :: Bash Script That Reads Lines In While Loop

May 26, 2011

So I need to write a bash script that can read lines and column 3 from a file. It needs to start on line 16 and read every 20th line starting from there. But the value that it reads needs to be checked, should it be too great I need it to shut the program down.I'm pretty new to bash, but my ultimate goal is being able to safely run a program on a GPU for an extended period of time with out worrying about it overheating. I have a command that outputs information from the GPU every second, and I can save this to a file. So all I really need is something to read and check that file, I played around a bit with the awk command and can't get it to work within my for loop with dynamic variable.

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Programming :: (BASH) How To Read Multiple Lines From Text File

Mar 11, 2011

For example, I have a text file with data which lists numerical values from two separate individuals

Person A

Person B

How would I go about reading the values for each Person, then being able to perform mathematical equations for each Person (finding the sum for example)?

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Programming :: Bash Script To Count Number Of Lines With A Specific Property7?

Aug 11, 2010

I would like to parse an input file in which there are two columns per each row. We want to see how many lines are duplicated where we define duplicate to be having the same second field and different first field. For instance if the input file looks like the following:

79874 13131
79873 12309
79820 13131


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Programming :: Bash Script To Find And Remove Similar Lines From Multiple Files?

Jun 5, 2009

I want to remove duplicate or multiple similar lines from multiple files. I.e. if I have four files file1.txt file2.txt file3.txt and file4.txt and would like to find and remove similar lines from all these files keeping only one line from these similar lines. I only that uniq can be used to remove similar lines from a sorted file.

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Ubuntu :: Calculate An Average In A Simple Way With Bash?

Mar 3, 2010

does anyone know how to calculate an average in a simple way with bash? I've got something like this:

$ cat results.txt | head -10 | tr " " " " | cut -f13


and now I want to calculate the average of the resulting numbers. I know I could write a bash or awk or perl script and use that, but isn't there a more simple, elegant way? There is for example "sum" in the coreutils, but no "avg"..

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General :: Calculate Duration In Seconds In Bash ?

Nov 15, 2010

I would like to subtract the end time with a start time in bash. How can I do it?

Here's a script of example of what I want:

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Programming :: Bash Text To Variable Accessing Individual Text Lines?

May 2, 2010

i am on processing text tasks And i found that if you assign a text to a variable is chomp'ed automatically the newline


variable=$(cat file.txt)

The problem is i can only access the items/lines using:


for line in $variable
echo $line
# Other commands

how do i convert this to an indexed array. More importantly, how do i get access to individual $line[0], ..., $line[n] Another thing, if the file.txt, has lines with spaces it is a mess using the, but echoing prints line by line...o_0

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Programming :: Remove Lines And Parts Of Lines From Python Strings?

Nov 24, 2009

How do you remove parts of strings using python? Such as, if I have something like:

erme1 sdifskenklsd
erme2 sdfjksliel


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Programming :: Calculate Length Of My Array?

Jun 30, 2010

I want to calculate length of my array, say Unix here.

[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Red Hat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$
[linux1@HMLINUX1 abc]$ echo ${#Unix[@]}

This should be ideally 4, but somehow it is showing as 5. However, when I am removing the space as RedHat instead of Red Hat, it is working perfectly.

[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Redhat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$ echo ${#names[@]}

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Programming :: Calculate Data And Make It Into New Column Using Awk?

May 24, 2011

i've been using a awk script to calculate my data... i have 3 files:

file a1.txt:



the results were (3.5, 6 and 3) which is pretty easy.. now i want to combine all this into 1 file and each have different columns and called it avg.txt which have something like this in the end:

3.5 6 3

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Programming :: Clock() - Calculate How Much Time Does My Program Run?

May 11, 2011

im trying to calculate how much time does my program run, use very simple script

clock_t end, start;
start= clock();
int i;
printf("initial %d

but it outputs 0 all the time. cant figure out where could be the problem.

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Programming :: Calculate The Time Taken For A Sample Program To Run?

Apr 24, 2011

i have the example code below, i want to calculate the time taken for a sample program to run. but i keep getting undefined reference error.

#include <sys/time.h>
#include <iostream>
int main(int argc, char **argv) {
struct timeval startTime;
struct timeval endTime;


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Programming :: Calculate The Amount Of Data Had Been Download?

May 3, 2011

i'm trying to write a program with c socket programming,what i am trying to reach is a program which will calculate a computer's downloaded data from the internet,just to know how much he/she download?

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Programming :: Calculate The Number Of - Necessary - Bits In A Byte ?

Jun 11, 2010

E.g. 98 is represented as 1100010 (number of valid bits is 7)

What is the formula to calculate the number of valid bits in a byte ?

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Programming :: Calculate How Many Nanosecond The Process Takes

Apr 10, 2011

ı need to calculate how many nanosecond the process takes . must give the same value every time (c++) ubuntu 10.10 my system information:

description: CPU
product: Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
vendor: Intel Corp.
physical id: 400


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Programming :: Calculate The Blade Offset In Python?

Dec 30, 2010

I'm using pyqt3 for my app and am lost on even how to attempt this task... On a vinyl cutter to have the blade pivot it must be offset from the center of the shaft it's on so say for example a .25mm offset would leave a .25mm unwanted vinyl attachment when the cutting is done. I somehow have to average or extrapolate that .25mm xy coordinate and add it to the hpgl plot file as a PUx,y; command? I have enclosed a simple sample file that has three images in it. In the corresponding hpgl file everything between the PU commands that are starting with PD are the code for that image (star for eg the pu to move to next image and then all PD for the next image and so on, so once the formula or procedure is figured out it can be applied to as many images there are in the file. Placing the new command at the head of each image PD group. Since there are absolute and relative cutters I enclosed the same exact plot for both types as the coordinates on relative can be negative numbers. Only PU and PD commands and a ";" as a command delimiter as sometimes many commands are on one line.The offset variable will come from a spinbox but .25 is good for an example.

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Programming :: Sudoku - Calculate The Correct Box For A Given Square?

Apr 8, 2011

Im doing a sudoku-solver as a school assigment in Java. It is supposed to solve both 6x6, 9x9 and 12x12 boards.Im pretty much done with my algorithm(brute force), but I'm having a hard time figuring out how to calculate the right Box for a Square. I found this snippet:


// calculate BoardPos for index, where index is 0..80
void loadBoardPosFromIndex(BoardPos &pos, int index) {
pos.index = index;


This works on 9x9 boards, but I really dont get the math behind this, and how I can create a generic rule for both 6x6, 9x9 and 12x12 boards.

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Programming :: Awk - Calculate The Number Of Words Containing Letter E In A Textfile?

Oct 12, 2010

i need to calculate the number of words containing letter e in a textfile.

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Programming :: Write A Script That Will Calculate A Directory Size?

Jan 20, 2009

I'm trying to write a script that will calculate a directory size and if the size is greater than 4GB, it will send out an email. But I am getting the "integer operation expected" error when it tries to calculate the current disk size. Here's my script.


SUBJ="Ready for DVD burning on `hostname`"


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Programming :: Calculate Flash Memory End Address Of A Certain File?

Mar 9, 2011

how to calculate (if possible) the end address of an image file in a flash memory. I'm trying to create a checksum and checkheader function and the info that I got is the file's offset, how many sector it consumes and its size. I kinda need the end address, sad thing is, I don't know how to calculate it.test.img's start address is 0, the size is 0x20000 and consumes 3 sectors.

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Programming :: Calculate The Minutes Difference Between Two Dates Using The Function Mktime() On C++?

Jul 28, 2010

I'm trying to calculate the minutes difference between two dates using the function mktime() on c++. The dates will be passed to me as struct tm, and I will use this function many many times. The example below shows what I wanna do:


int main(int argc, char** argv) {
while (1) {
tm date2;
tm date1;


I read the mktime() description on c++ reference, searched google... but there is no light

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Programming :: Write A Script To Calculate The Total Amount Of Installed Memory?

Apr 4, 2011

I am trying to write a script to calculate the total amount of installed memory to use during an anaconda kickscript, so the swap file is created at 2 x the installed memory. I so far have the amount of installed RAM DIMMS but need a way to total them up and produce a varible I can use in the pre section of the install.


dmidecode -t 17 | grep Size | awk ' { print $2 }'

Note: on some servers there could be from 1 DIMM up to 16 DIMMS installed so the script needs to be able to handle this. I also can not use bc as it does not exist during the install stage. I am guessing I need a while loop to do this and use expr but do not know where to start for this logic.

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General :: Bash Script To Find Lines Containing Two Different Strings

Mar 13, 2011

I'm trying to write a bash script to find all lines containing two different strings in many files. I don't have access to egrep so I want to use sed for this purpose.

The files will look like this:

I want to generate a new file from these files with only the rows containing Data and Start. Something like this:
for y in `ls /file*.db`;
do sed '/Data|Start/p' $y > newfile

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General :: Use Sed In Bash To Match Pattern Contained In 2 Lines?

Mar 14, 2011

I have a file called test. It has the following contents.Code:there youI want the output to be.Code:replaced youI am trying to use the sed command to replace every occurance of "hey newline there" with "replaced". I tried the following naive apporach.Code:sed 's/heythere/replace/' testThis gives a result containing the same data as the test file.

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