I just need to perform a simple operation of subtracting two numbers - that aren't whole numbers, i.e 200.56 - 67.24attempting to use expr i merely get "expr: non-numeric argument"
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How can i get bc to subtract negative numbers?
View 10 Replies View RelatedI have a script in the works that reads an MP3 file and gets the track length. Trouble is, it gives me the total seconds, like this:
Sample Track.mp3 = 225.55 seconds
What I'd like to have is that 225.55 converted into minutes:seconds format (in this case, 3:45). How can I do this?
Can anyone specify the methods how to add decimal numbers in Linux
View 5 Replies View RelatedFor eg: $NUMBEROFPASSES=6.19 to round up I use NUMBEROFPASSES=$(printf %.0f $NUMBEROFPASSES) What I need to do is round up from eg: 6.10 to be 7 and if lower than 6.10 round down to 6
View 5 Replies View RelatedI'm learning shell scripting using bash and I want to generate 4 floating point number with 5 decimal places and write them to a file and a variable. I've done all this except the $RAMDOM enviroment variable does not generate a float number but a integrer.
[code]...
I have lines in some files that look exactly as below, and the line numbers they occur in are always the same. (Lines 136-139)
W 0.00000000 0.00000000 2.00000000
W 0.50000000 0.50000000 2.50000000
W 0.00000000 0.00000000 3.00000000
[code]...
I have two text files on Linux. One contains a list of valid IDs. E.g:
abcd
efgh
ijkl
etc.
The other contains a list of invalid IDs. But, some of these also appear on the list of valid IDs, in this example "efgh":
mnop
qrst
efgh
etc.
How can I easily construct a text file that contains all the lines from the invalid list that do not appear in the valid list? That is, I want to end up with a text file that has:
mnop
qrst
etc.
I'd like either some Linux commandline magic of some clever Vim trickery.
I have a directory with files like this:
Code:
And what I'd like is to have the files renamed like this:
Code:
How could I code it so that it removes the numerical part of the filename (at the beginning), even with different patterns (like the 01 - artist vs the 01-artist)?
snappy title to grab attention. maybe not stupid, but bleeding difficult to use, talk about a non-obvious, non-intuitive interface; I want to enter a hex value, and have the calculator convert that to decimal. So, I use the pull-down, choose 'hexadecimal', enter the hex value, then change the pull down to 'decimal', expecting to see the decimal (base 10) value. What do I see? The display just adds the hexadecimal base to the end of the hex value I just wrote! Where's my decimal (base 10) number damn it? I can't for the life of me work it out.
View 4 Replies View Relatedi am using putty to connect to the linux server and i am using nano as my text editor to write a bash script.
this is my script:
echo "Please enter your Username"
read userName
userName= grep $USER /etc/passwd | cut -d: -f5
echo "Welcome " $userName | cat >> output.txt
the problem i have is that when i enter my username, the output (my real name) does not display in the output.txt. instead it displays in putty. so when i run my script in putty it shows the message to enter username and after i enter my username my real name appears below it. i want it to show in the output.txt
Code:
#!/bin/bash
echo 'obase=2;10'|bc
[code]...
I just noticed there doesn't seem to be a decimal point button on the calculator (gcalctool 5.32.0) when it is in programming mode. I'm using Fedora 14 (32-bit).
View 4 Replies View RelatedI have a script that creates a textfile with ip addresses and ports, but the ports are in hex format so they need to be converted.
Currently I have this code:
Code:
I'd like to have the second column in decimal instead of hex, like this:
Code:
Is there any way to do that with awk, preferably in a oneliner? Would printf be an option?
am writing a small search program for my class. I have decided to use indexing for my program. Ive researched online about indexing and how search engines do it. If im gonno do that I need to create inverted files to associate files to numbers ( numbers being the index of my paths ) . Now I was wondering what would be the best way to create an inverted file ? I was going to create sql tables using mysql api in C but then again there is no array data type or vectors to store few numbers in a single column in mysql and it is not advised to use Enum or SET
View 14 Replies View RelatedI'm writing an if statement where a variable is a number such as 14.05 (this is actually a temperature) and I want to compare it to a predefined value, sample code below:
Code:
I have all sorts of errors regardless of how I do this (double quotes, square brackets). The best idea I've had is stripping off the decimal place so it's a 4 digit number (e.g warning=1503 and DEV_TMP=1405) however this seems a little unnescessary and I'm sure there's an easier way of achieving the same thing.
Our assignment is to take in two numbers and add them. While the inputs will always be numbers, we are to inform the user if they are doing it wrong. My code:
[Code]....
The code worked fine before I tried to idiot-proof it. I'll probably end up nesting the if statements checking if the first two inputs are not null, but I'm more annoyed at why the script isn't working.
I'm making an bash script.
As input you can input different numbers from 1 to 3.
Depending from the input a text shows up.
as a result of a find command, i have
852065 72: /bin/gunzip
852065 72: /bin/gzip
852065 72: /bin/zcat
(the first column is inode number and the second is size if you're curious)
I want to be able to format it in a way such that:
852065 72:
/bin/gunzip
/bin/gzip
/bin/zcat
I know I can get the bottom half using awk- but I can't figure out how to extract the first set of numbers and get them to appear only once
I have to read a couple of numbers from a random.txt file. In this .txt file there are random numbers. They are separated by a space. Example if you opened test.txt:
test.txt :1 6 1 3 6 8 10 2 4
I would like to read those numbers using CAT and store them into an array:
numlen=${#num[*]} - (must be like this because it is a part of a larger program)
I have some code that opens a directory and reads in the names of files which are e.g. 0001, 0002, 0003 up to 9999I need to get all these numbers and then generate a new number that is not one of these numbers already.here is my code to check the files in the directory
DIR *d;
struct dirent *dir;
int i = 0;
[code]....
write a script in bash or shell to add the numbers between and including two numbers
View 3 Replies View RelatedTurns out I don't have bc in my Ubuntu distro and I can't install it. how to subtract two variables (BASH variables) from awk and set the result as another variable, e.g: finalvalue=`awk '{print $first - $second}'`
View 2 Replies View RelatedAs some of you know that I am new to this forum. I have another problem that I got stuck on. I have this file called "Fib.rbb" and my instructor told us to write an interpreter program by using Fib.rbb.
"You are to write an interpreter in Perl for Rongs Basic Basic (RBB) as explained in class. The BNF description for RBB and a test file called Fib.rbb are part of the RBB.zip file which is available in the Course Documents folder on blackboard. If you call your interpreter myIntp.pl, you would execute the program via perl myIntp.pl Fib.rbb
Code: Print "A few Fibonacci numbers:"
Looking for code to add 5 numbers in assembly? I want to use array for input of those 5 numbers. No problem if the output is 1 digit(0....9).
View 3 Replies View RelatedI am trying to extract 2 numbers from a same file and my goal is to print them both in another file, on the same line, separated with a space. I have to do that for 20 files and I would like to have therefore 20 lines like this in the output file. It would look like this :
Quote:
number1_file1 number2_file1
number1_file2 number2_file2
...
...
number_1_file20 number2_file20
So far, I did only extract one number and got an output file like this :
Quote:
number1_file1
number1_file2
...
...
number1_file20
And I did this by running a bash script with the following content :
Code:
#!/bin/bash
ls execution$1$2*.* | while read filename
do
cat $filename | grep -e "Total aborts:" | cut -d " " -f3 >> abort$1$2.dat
done
$1 and $2 are just strings to identify the different files I want to consider in this loop. This script works well to extract a number which is the 3rd field of a line starting with "Total aborts:".Now, how could I change this script to do what I mentioned above (i.e. extracting two numbers from two different lines) ? The second number is the 3rd field of a line starting with "Total throughput:"
I want the get the date of the oldest log in this directory and compare it with current date.Time of the each log can be seen before ".Z" prefix.I have written the following piece of code. However, it is not working for the following case:
LOGDAY=20101129
TODAY= 20101201
Difference is 72, which is not correct, since these are dates.
I'm trying to write a program that generates a random number and then tells if it is prime or not. I have doe some research about how to calculate prime and random numbers but I'm still having trouble. I don't really get how to calculate a prime number. I know a prime number is a number that is divisible by 1 and and itself. how to calculate a prime number in C?
View 10 Replies View RelatedI am struggling to understand why nawk matches values that are either 1 or 2 digits in length, but not 100 (3 digits).
Am I missing something obvious ? Should I use substr to remove the % ?
I am sure it's something to do with character and string matching behaviour with nawk.
Code:
I have a program that sends QByteArray datagrams over a udp socket. I would like to have 4 bytes of the datagram that contain a 32 bit integer. When saving numbers to the QByteArray, I have tried the static function number(int) and member function setNum(int), but they convert the integer to its decimal string representation and save that in the byte array. So if the number were 10, it takes 2 bytes, if it were 10,000,000 it takes 8 bytes. This wastes space, and makes it more difficult to get the number when it is packed with a few other pieces of data in the same datagram. Is there a standard way of doing this in Qt?
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