Grep for a negative number Post: 302272951

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1. Programming

C++ how to isdigit() a negative number?

hi people, I have a function which I am passing a stream which is basically postfix notation if(isdigit(in.peek())) { in >> number; nums.push(number); } else if (strchr("+-*/", in.peek( )) != NULL) { in >> symbol; do_operation(symbol, nums, okay); } ...

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ignore negative number in script

Hi, does anyone know how to ignore whether a number is negative in a script. E.g. if I have a variable that contains -1200, how do I ignore the minus sign?

3. HP-UX

Division returning a negative number

Hi All, Just faced an interesting thing in HP-UX. I was dividing 2955334616 / 2 by using echo `expr 2955334616 / 2` , and this ofcourse which expects 1477667308 to be returned. But I am getting -669816340 and I am :wall: how exactly this is possible. It is not one of the compliments (Ones or...

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Taking largest (negative) number from column of coordinates and adding positive form to every other

Hello all, I'm new to the forums and hope to be able to contribute something useful in the future; however I must admit that what has prompted me to join is the fact that currently I need help with something that has me at the end of my tether. I have a PDB (Protein Data Bank) file which I...

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Grep for the most negative number

Hello, I am trying to write a bash script which will give me the most negative number. Here is an example input: Ce 3.7729752124 -4.9505731588 -4.1061257680 Ce -6.9156611391 -0.5991784762 7.3051893138 Ce 7.6489739875 0.3513020731 ...

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Print smallest negative number with corresponding index from a column

considering the following table: ID col1 col2 col3 col4 1 -16.06801249 13.49785832 -56.57087607 -27.00500526 2 -1.53315720 0.71731735 -42.03602078 -39.78554623 3 -1.53315190 0.71731587 -42.03601548 ...

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Is it possible to Divide a negative number in bash script

I am using a small script to divide some numbers in a given file and display the output in another file. I am getting the following error basename: invalid option -- '5' Try `basename --help' for more information. (standard_in) 1: syntax error The script is : #!/bin/bash for i in `cat...

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Grep negative matching

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Negative number comparison using nawk on Linux

Hi All, I am trying to compare two negative numbers using awk on linux.But it is giving me wrong result.Same code is working perfectly on solaris. print ((0+new_price) < MIN_PRICE) e.g If I try to compare -1.32(new_price) and -500(min_price) using "<" operator, output is 1 i.e true. ...

10. UNIX for Beginners Questions & Answers

Converting negative number to positive in a file

Hi ALL, I am having semi column separated file as below. I am having negative values for the records starting with 11095. How can I convert that positive number I tried this below seems not working sed 's/ $*$$/ -\1/;t;s/$.*$-/\1/ myfile myfile...

LEARN ABOUT LINUX

zegrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)

10 More Discussions You Might Find Interesting

1. Programming

C++ how to isdigit() a negative number?

Discussion started by: Darklight

2. Shell Programming and Scripting

ignore negative number in script

Discussion started by: borderblaster

3. HP-UX

Division returning a negative number

Discussion started by: mail2sanand

4. Shell Programming and Scripting

Taking largest (negative) number from column of coordinates and adding positive form to every other

Discussion started by: crunchgargoyle