how to move file pointer to a particular line in c
Hello experts,
I ve a text file I want to go to particular line . what is the best way to do this in c ?
I am tried as follows
but this functions moves the file pointer according to a number of bytes. Unfortunately I don't know the exact byte of the desired pointer position. All I have is the Line no I want to go , and that is my variable pos here.
suppose pos = 10 , then I want to jump to the 10th record in my text file. and one more thing my text file is about 2 million lines.
regards,
user_prady
--
Last edited by user_prady; 03-26-2008 at 01:03 AM..
I have a text file that has blocks of text. Each block starts with ### and ends with End_###.
I wrote a perl script to search a string from line 2 (ignore any line starts with ###) of each block
if matched, need to print that whole block. According to the input file in below, it will print... (5 Replies)
Hi,
I have a file called /bb/bin/rstrt.
I need to move the line/entry "ccpm_load_shared_memory" after the entry
"initcorp". The problem is that there are several entries for "initcorp" in this file and I need the entry to be moved only after the first instance of "initcorp"
Is there a way... (5 Replies)
I'm rather new to scripting, and despite my attempts at finding/writing a script to do what I need, I have not yet been successful.
I have a file named "list.txt" of arbitrary length with contents in the following format:
/home/user/Music/file1.mp3
/home/user/Music/file2.mp3... (21 Replies)
If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:
int my_malloc(int size, char **pmem)
{
*pmem=(char *)malloc(size);
if(*pmem==NULL)... (11 Replies)
Can somebody help me with a script ....
Read a file /etc/inittab
find the string starting with rcml and move it entirely towards the end of file.
rcml:2:once:/usr/sni/aix52/rc.ml > /dev/console 2>&1
I basically want to change the startup sequence. (2 Replies)
I have a script with this statement:
/usr/xpg4/bin/awk -F"" 'NR==FNR{s=$2;next}{printf "%s\"%s\"\n", $0, s}' LOOKUP.TXT finallistnew.txt >test.txt
I want to include logic or an additional step that says if there is no data in field 3, move the whole line out of test.txt into an additional... (9 Replies)
I want a script that will move everything beyond a certain line number or beyond a certain content word into another file.
For example, if file A has this:
first line
second line
third line
forth line
fifth line
sixth line
I want to run a script that will move everything beyond the third... (4 Replies)
Hi ,
I need your help for the below issue.
I have a file which has data as below
An error came (/u01/app/12.csv)
pkg1.func1: detail s 1111-->pkg1.func1: detail s 2222-->
Now pkg1.func1: .... --> can come multiple times in the second line.
I need to arrange the data in the below... (9 Replies)
Hi,
I have a following file and it has only one occurrence of line that says "Output view:". It could be in middle somewhere ( i don't know the exact location ). I want to move it as the first line of the file.
Input
AAA
BBBB
CCCC
Output view:
XXXX
YYYY
ZZZZ
Output should be:
Output... (13 Replies)
Hey there,
I joined this forum just now cause I need help with an old SUN machine at work. I work on a helpdesk and we use a SOLARIS 5.10 OS. Every once in a while we will try to move one of our windows out of the way to make room on the desktop, and sometimes the mouse doesn't release what we... (7 Replies)
Discussion started by: TRex_2005
7 Replies
LEARN ABOUT DEBIAN
fseek
FSEEK(3) Linux Programmer's Manual FSEEK(3)NAME
fgetpos, fseek, fsetpos, ftell, rewind - reposition a stream
SYNOPSIS
#include <stdio.h>
int fseek(FILE *stream, long offset, int whence);
long ftell(FILE *stream);
void rewind(FILE *stream);
int fgetpos(FILE *stream, fpos_t *pos);
int fsetpos(FILE *stream, fpos_t *pos);
DESCRIPTION
The fseek() function sets the file position indicator for the stream pointed to by stream. The new position, measured in bytes, is
obtained by adding offset bytes to the position specified by whence. If whence is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is
relative to the start of the file, the current position indicator, or end-of-file, respectively. A successful call to the fseek() function
clears the end-of-file indicator for the stream and undoes any effects of the ungetc(3) function on the same stream.
The ftell() function obtains the current value of the file position indicator for the stream pointed to by stream.
The rewind() function sets the file position indicator for the stream pointed to by stream to the beginning of the file. It is equivalent
to:
(void) fseek(stream, 0L, SEEK_SET)
except that the error indicator for the stream is also cleared (see clearerr(3)).
The fgetpos() and fsetpos() functions are alternate interfaces equivalent to ftell() and fseek() (with whence set to SEEK_SET), setting and
storing the current value of the file offset into or from the object referenced by pos. On some non-UNIX systems an fpos_t object may be a
complex object and these routines may be the only way to portably reposition a text stream.
RETURN VALUE
The rewind() function returns no value. Upon successful completion, fgetpos(), fseek(), fsetpos() return 0, and ftell() returns the cur-
rent offset. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
EBADF The stream specified is not a seekable stream.
EINVAL The whence argument to fseek() was not SEEK_SET, SEEK_END, or SEEK_CUR.
The functions fgetpos(), fseek(), fsetpos(), and ftell() may also fail and set errno for any of the errors specified for the routines
fflush(3), fstat(2), lseek(2), and malloc(3).
CONFORMING TO
C89, C99.
SEE ALSO lseek(2), fseeko(3)COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 1993-11-29 FSEEK(3)