Hi guys i need help with comparing lines in 2 separate files. Both files contain the same amount of lines and i need to output the difference into the 2nd file.
The 1st file is always correct.
1st file (Expected.e):
Tuesday, 11 August 2009
Wednesday, 12 August 2009
Thursday, 13 August 2009... (2 Replies)
i have 2 files and i want to compare
i currently cat the files and awk print $1, $2 and doing if file1=file2 then fail, else exit 0
what i want to do is compare values, with column 1 being a reference i want to compare line by line and then still be able to do if then statement to see if worked... (1 Reply)
I want to search files (basically .cc files) in /xx folder and subfolders.
Those files (*.cc files) must contain #include "header.h" AND x() function.
I am writing it another way to make it clear,
I wanna list of *.cc files that have 'header.h' & 'x()'. They must have two strings, header.h... (2 Replies)
Hi,
I have two files with below data::
file1:-
123|aaa|ppp
445|fff|yyy
999|ttt|jjj
555|hhh|hhh
file2:-
445|fff|yyy
555|hhh|hhh
The records present in file1, not present in file 2 should be writtent to the out put file.
output:-
123|aaa|ppp
999|ttt|jjj
Is there any one line... (3 Replies)
Hello I'm having a little difficulty in writing a shell script for a few simple tasks.
First I have two files "file1.txt" and "file2.txt" and I want to read and compare the last line of each file. The files look like this.
File1.txt
File2.txt
After comparing the two lines I would... (2 Replies)
Hi everyone
I have a question for you, as I am trying to learn more about Perl and work with some weather data. I have an ascii file (shown below) that has 10 lines with different columns. What I would like is have Perl find an "anomalous" value by comparing a field with the values from the last... (2 Replies)
GM,
I have an issue at work, which requires a simple solution. But, after multiple attempts, I have not been able to hit on the code needed.
I am assuming that sed, awk or even perl could do what I need.
I have an application that adds extra blank page feeds, for multiple reports, when... (7 Replies)
Discussion started by: jxfish2
7 Replies
LEARN ABOUT OPENDARWIN
dup2
DUP(2) BSD System Calls Manual DUP(2)NAME
dup, dup2 -- duplicate an existing file descriptor
SYNOPSIS
#include <unistd.h>
int
dup(int oldd);
int
dup2(int oldd, int newd);
DESCRIPTION
Dup() duplicates an existing object descriptor and returns its value to the calling process (newd = dup(oldd)). The argument oldd is a small
non-negative integer index in the per-process descriptor table. The value must be less than the size of the table, which is returned by
getdtablesize(2). The new descriptor returned by the call is the lowest numbered descriptor currently not in use by the process.
The object referenced by the descriptor does not distinguish between oldd and newd in any way. Thus if newd and oldd are duplicate refer-
ences to an open file, read(2), write(2) and lseek(2) calls all move a single pointer into the file, and append mode, non-blocking I/O and
asynchronous I/O options are shared between the references. If a separate pointer into the file is desired, a different object reference to
the file must be obtained by issuing an additional open(2) call. The close-on-exec flag on the new file descriptor is unset.
In dup2(), the value of the new descriptor newd is specified. If this descriptor is already in use, the descriptor is first deallocated as
if a close(2) call had been done first.
RETURN VALUES
The value -1 is returned if an error occurs in either call. The external variable errno indicates the cause of the error.
ERRORS
Dup() and dup2() fail if:
[EBADF] Oldd or newd is not a valid active descriptor
[EMFILE] Too many descriptors are active.
SEE ALSO accept(2), open(2), close(2), fcntl(2), pipe(2), socket(2), socketpair(2), getdtablesize(2)STANDARDS
Dup() and dup2() are expected to conform to IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution