Is there a command that sets a variable length?
I have a input of a variable length field but my output for that field needs to be set to 32 char.
Is there such a command?
I am on a sun box running ksh
Thanks (2 Replies)
Hi ,
I have a peculiar case, where my sed command is working on a file which contains lines of small length.
sed "s/XYZ:1/XYZ:3/g" abc.txt > xyz.txt
when abc.txt contains lines of small length(currently around 80 chars) , this sed command is working fine.
when abc.txt contains lines of... (3 Replies)
Hello,
I am checking the length of each line of a fixed length file and making sure all lines are 161 length. My problem is that some files contain null characters which gets stripped out of my echo. How do I have the NULLs included in my check? (and I cannot replace or sub the NULL values with... (10 Replies)
Very, very new to unix scripting and have a unique situation. I have a file of records that contain 3 records types:
(H)eader Records
(D)etail Records
(T)railer Records
The Detail records are 82 bytes in length which is perfect. The Header and Trailer records sometimes are 82 bytes in... (3 Replies)
Hi,
Can anyone help with a effective solution ?
I need to change a variable length text field (between 1 - 18 characters) to a fixed length text of 18 characters with the unused portion, at the end, filled with spaces.
The text field is actually field 10 of a .csv file however I could cut... (7 Replies)
Hello Everyone,
I am stuck with one issue while working on abstract flat file which i have to use as input and load data to table.
Input Data-
------ ------------------------ ---- -----------------
WFI001 Xxxxxx Control Work Item A Number of Records
------ ------------------------... (5 Replies)
Hello All,
I have this script that does stuff like "starting, stopping & restarting" a Daemon Process running on my machine...
My main question is why in part of my code (which you will see below) does the Array Length (i.e. ${#PIDS} )
return "1" when I know the Array is empty..?
Here is... (17 Replies)
Hi Team,
I have an issue to split the file which is having special chracter(German Char) using awk command.
I have a different length records in a file. I am separating the files based on the length using awk command.
The command is working fine if the record is not having any... (7 Replies)
Discussion started by: Anthuvan
7 Replies
LEARN ABOUT MOJAVE
truncate
TRUNCATE(2) BSD System Calls Manual TRUNCATE(2)NAME
ftruncate, truncate -- truncate or extend a file to a specified length
SYNOPSIS
#include <unistd.h>
int
ftruncate(int fildes, off_t length);
int
truncate(const char *path, off_t length);
DESCRIPTION
ftruncate() and truncate() cause the file named by path, or referenced by fildes, to be truncated (or extended) to length bytes in size. If
the file size exceeds length, any extra data is discarded. If the file size is smaller than length, the file is extended and filled with
zeros to the indicated length. The ftruncate() form requires the file to be open for writing.
Note: ftruncate() and truncate() do not modify the current file offset for any open file descriptions associated with the file.
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
The ftruncate() system call will fail if:
[EBADF] fildes is not a valid descriptor open for writing.
[EFBIG] The file is a regular file and length is greater than the offset maximum established in the open file description associ-
ated with fildes.
[EINVAL] fildes references a socket, not a file.
[EINVAL] fildes is not open for writing.
[EROFS] The named file resides on a read-only file system.
The truncate() system call will fail if:
[EACCES] Search permission is denied for a component of the path prefix.
[EACCES] The named file is not writable by the user.
[EFAULT] Path points outside the process's allocated address space.
[EISDIR] The named file is a directory.
[ELOOP] Too many symbolic links are encountered in translating the pathname. This is taken to be indicative of a looping symbolic
link.
[ENAMETOOLONG] A component of a pathname exceeds {NAME_MAX} characters, or an entire path name exceeds {PATH_MAX} characters.
[ENOENT] The named file does not exist.
[ENOTDIR] A component of the path prefix is not 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.
The ftruncate() and truncate() system calls will fail if:
[EFBIG] The length argument was greater than the maximum file size.
[EINTR] A signal is caught during execution.
[EINVAL] The length argument is less than 0.
[EIO] An I/O error occurred while reading from or writing to a file system.
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