Hi All,
i have an input below.
As long as "x= 1" , i would want to capture 2 lines using sed or awk
for eg :
0001 x= 1 $---------------------------------..-.--..
0001 tt= 137 171 423 1682 2826 0
Pls help. Thanks in advance.
Note that the number of lines in each block do... (37 Replies)
Hi,
I am processing a file and would like to delete duplicate records as indicated by one of its column. e.g.
COL1 COL2 COL3
A 1234 1234
B 3k32 2322
C Xk32 TTT
A NEW XX22
B 3k32 ... (7 Replies)
i have the long file more than one ns and www and mx in the line like .
i need the first ns record and first www and first mx from line .
the records are seperated with tthe ; i am try ing in awk scripting not getiing the solution.
... (4 Replies)
Hi,
I have a log file having size of 48mb.
For such a large log file. I want to get the message in a particular format which includes only unique error and exception messages.
The following things to be done :
1) To remove all the date and time from the log file
2) To remove all the... (1 Reply)
I need help with a script that will remove all HTML tags from an HTML document and remove any consecutive duplicate lines, and save it as a text document. The user should have the option of including the name of an html file as an argument for the script, but if none is provided, then the script... (7 Replies)
Hello, I'm trying to delete duplicates when there are more than 10 duplicates, based on the value of the first column.
e.g.
a 1
a 2
a 3
b 1
c 1
gives
b 1
c 1
but requires 11 duplicates before it deletes.
Thanks for the help
Video tutorial on how to use code tags in The UNIX... (11 Replies)
Dear members, I need to filter a file based on the 8th column (that is id), and does not mather the other columns, because I want just one id (1 line of each id) and remove the duplicates lines based on this id (8th column), and does not matter wich duplicate will be removed.
example of my file... (3 Replies)
Hello all, I am working on a file like below:
site Date time value1 value2
0023 2014-01-01 00:00 32.0 23.7
0023 2014-01-01 01:00 38.0 29.9
0023 2014-01-01 02:00 85.0 26.6
0023 2014-01-01 03:00 34.0 25.3
0023 2014-01-01 04:00 37.0 23.8
0023 2014-01-01 05:00 80.0 20.3
0023 2014-01-01 06:00... (16 Replies)
Hi,
In an ideal scenario, I will have a listing of db transaction log that gets copied to a DR site and if I have them all, they will be numbered consecutively like below.
1_79811_01234567.arc
1_79812_01234567.arc
1_79813_01234567.arc
1_79814_01234567.arc
1_79815_01234567.arc... (3 Replies)
Hello,
I'm trying to remove the duplicate consecutive lines with specific string "WARNING".
File.txt
abc;
WARNING 2345
WARNING 2345
WARNING 2345
WARNING 2345
WARNING 2345
bcd;
abc;
123
123
123
WARNING 1234
WARNING 2345
WARNING 2345
efgh; (6 Replies)
Discussion started by: Mannu2525
6 Replies
LEARN ABOUT DEBIAN
dup2
DUP(2) BSD System Calls Manual DUP(2)NAME
dup, dup2 -- duplicate an existing file descriptor
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
dup(int oldd);
int
dup2(int oldd, int newd);
DESCRIPTION
The dup() system call 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) system 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 and oldd != newd, the descriptor is first
deallocated as if the close(2) system call had been used. If oldd is not a valid descriptor, then newd is not closed. If oldd == newd and
oldd is a valid descriptor, then dup2() is successful, and does nothing.
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
The dup() and dup2() system calls fail if:
[EBADF] The oldd or newd argument is not a valid active descriptor
[EMFILE] Too many descriptors are active.
SEE ALSO accept(2), close(2), fcntl(2), getdtablesize(2), open(2), pipe(2), socket(2), socketpair(2)STANDARDS
The dup() and dup2() system calls are expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
HISTORY
The dup() and dup2() functions appeared in Version 7 AT&T UNIX.
BSD June 4, 1993 BSD