Hi ,
I'm looking for a way to merge two lines only for a given pattern / condition.
Input :
abcd/dad + -49.201 2.09 -49.5 34 ewrew rewtre *
fdsgfds/dsgf/sdfdsfasdd +
-4.30 0.62 -49.5 45 sdfdsf cvbbv *
sdfds/retret/asdsaddsa +
... (1 Reply)
Hi, I have a huge file which is about 50GB. There are many lines. The file format likes
21 rs885550 0 9887804 C C T C C C C C C C
21 rs210498 0 9928860 0 0 C C 0 0 0 0 0 0
21 rs303304 0 9941889 A A A A A A A A A A
22 rs303304 0 9941890 0 A A A A A A A A A
The question is that there are a few... (4 Replies)
This is a variation of an earlier post found here:
unixcom/shell-programming-scripting/159821-merge-two-non-consecutive-lines.html
User Bartus11 was kind enough to solve that example.
Previously, I needed help combining two lines that are non-consecutive in a file. Now I need to do the... (7 Replies)
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)
Hi Perl users,
I have another problem with text processing in Perl. I have a file below:
Linux Unix Linux Windows SUN
MACOS SUN SUN HP-AUX
I want the result below:
Unix Windows SUN
MACOS HP-AUX
so the duplicate string will be removed and also the keyword of the string on... (2 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)
Discussion started by: newbie_01
3 Replies
LEARN ABOUT FREEBSD
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 new descriptor returned by the call is the lowest num-
bered 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
These calls return the new file descriptor if successful; otherwise the value -1 is returned and the external variable errno is set to indi-
cate the cause of the error.
ERRORS
The dup() system call fails if:
[EBADF] The oldd argument is not a valid active descriptor
[EMFILE] Too many descriptors are active.
The dup2() system call fails if:
[EBADF] The oldd argument is not a valid active descriptor or the newd argument is negative or exceeds the maximum allowable
descriptor number
SEE ALSO accept(2), close(2), fcntl(2), getdtablesize(2), open(2), pipe(2), socket(2), socketpair(2), dup3(3)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 1, 2013 BSD