If you know the length of a file and the length of the last line in the file (from reading it previously or from prior knowledge of when the last line was added to the file), you could use:
to delete the last line of the file named by pathname without opening it.
hi there guys,
wonder if any gurus can help me out on this one...
try searching the past threads but cant find anything.
i have this huge file but when i use vi to open it it gives me the following error:
<"pmrepserver.txt""/var/tmp/Ex86200" There is not enough space in the file... (7 Replies)
Hi,
I need a help in deleting a line matching a particular pattern in a file using shell script without opening the file. The file is a .c/.cpp file. Is it possible?
Thanks (6 Replies)
Hi,
Could someone tell me how to delete a particular text inside an existing file without opening the file?
e.g. I have a text file called mytext.txt which contains three lines of text below and I want to delete “ ;” and delete the second line “b ;” including the carriage return.
a ;
b ;
c ;... (12 Replies)
Hi
To delete some text in 2 files in line1 ( not complete line) in unix without opening the files.
For example: source file is like this
<?xml version="1.0"... (5 Replies)
Hi Experts,
I have several big size file arround 900 MB. From the file I need to delete some common strings but without opening the file. here is example- in file
<?xml version='1.0' encoding='ISO-8859-1' standalone='no'?>
<LogItems>
<log logid="8423b5ae190810252359350480/1/1/1">
... (6 Replies)
Hi,
I have gps receiver log..its giving readings .like below
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GPSD,R=1
$GPGSV,3,1,11,08,16,328,40,11,36,127,00,28,33,283,39,20,11,165,00*71... (3 Replies)
I am using the while-loop to read a file.
The file has lines with null-terminated strings (words, actually.)
What I have by that reading - just a first word up to '\0'!
I need to have whole string up to 'new line' - (LF, 10#10, 16#A)
What I am doing wrong?
#make file 'grb' with... (6 Replies)
I'm trying to write a script that will do an ls of a location, echo it into a file, and then read that file and selectively delete files/folders, so it would go something like this:
cd $CLEAN_LOCN
ls >>$TMP_FILE
while read LINE
do
if LINE = $DONTDELETE
skip
elseif LINE =... (2 Replies)
Hi,
i have file which contains data as below(Only sample shown, it may contain more data similar to the one shown here)
i need to read this file line by line and generate an output file like the one below
i.e based on N value the number of MSISDNs will vary, if N=1 then the following... (14 Replies)
root@atrcx146:/# vi /etc/system
"/var/tmp/Exv9a4Rb" Read-only file system
Please let me know the reason (1 Reply)
Discussion started by: Marty11
1 Replies
LEARN ABOUT OPENDARWIN
ftruncate
TRUNCATE(2) BSD System Calls Manual TRUNCATE(2)NAME
truncate, ftruncate -- truncate or extend a file to a specified length
SYNOPSIS
#include <unistd.h>
int
truncate(const char *path, off_t length);
int
ftruncate(int fd, off_t length);
DESCRIPTION
Truncate() causes the file named by path or referenced by fd to be truncated or extended to length bytes in size. If the file previously was
larger than this size, the extra data is lost. If the file was smaller than this size, it will be extended as if by writing bytes with the
value zero. With ftruncate(), the file must be open for writing.
RETURN VALUES
A value of 0 is returned if the call succeeds. If the call fails a -1 is returned, and the global variable errno specifies the error.
ERRORS
Truncate() succeeds unless:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters.
[ENOENT] The named file does not exist.
[EACCES] Search permission is denied for a component of the path prefix.
[EACCES] The named file is not writable by the user.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EISDIR] The named file is a directory.
[EROFS] The named file resides on a read-only file system.
[ETXTBSY] The file is a pure procedure (shared text) file that is being executed.
[EIO] An I/O error occurred updating the inode.
[EFAULT] Path points outside the process's allocated address space.
Ftruncate() succeeds unless:
[EBADF] The fd is not a valid descriptor.
[EINVAL] The fd references a socket, not a file.
[EINVAL] The fd is not open for writing.
SEE ALSO open(2)BUGS
These calls should be generalized to allow ranges of bytes in a file to be discarded.
Use of truncate() to extend a file is not portable.
HISTORY
The truncate() and ftruncate() function calls appeared in 4.2BSD.
4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution