You're not supposed, and almost always can't, access the members of a FILE * structure. Its exact contents are platform and implementation specific. The code you were given will only work on the exact same implementation of stdio it was written to work with.
i have to print first n lines of a file. how can i do that without using head command. for some reason i do not want to use Head. is there a way to get that result using awk or sed?.
i an using this on korn shell for AIX
Thanks.. (7 Replies)
i try to install solaris OS in M4000 using OK prompts by boot net .
in my rules file i define the cpus like below
probe cpus
probe networks
networks 2 && cpus 8-10 && disksize c0t0d0 100000-292000 && disksize c0t1d0 100000-292000 && memsize 16384 && model SUNW,SPARC-Enterprise... (0 Replies)
Hi, I have the following problem. I have files with one column of data (let's say file1.dat, file2.dat...file6.dat), and I would like to record the first value of the column of each file into another file (let's name it fileall.dat), which would have the the six values, one in each column. I use to... (4 Replies)
hi,
Here my doubt is can we create a file using head/tail command in unix.
for example: my file consists 2000 lines , i want to cut it into 2. does this work please give correct command line.
head -1000 abc.txt > acd.txt
tail -1000 abc.txt > bdc.txt
hi,
Here my doubt is can we... (5 Replies)
hello everybody,
I have some files in directory.each file contain some data.
my requirement is add the count of each line of file in head of each file.
any advice !!!!!!!! (4 Replies)
Hi All,
I'm a newbie here, I'm just wondering how can i get the head of my file while using awk?
input data:
nik1,nik2,nik3
nik2,nik3,nik4
nik3,nik4,nik5
expected output is:
nik1 because it is in the top and it is in the first delimeted.
i tried awk -F "," '{print $1}' but i... (2 Replies)
HI
I have file A.txt
_1A
_2A
_3A
_4A
I want define all as different variable.
$1A=_1A
$2B=_2A
$3C=_3A
$4D=_4A
Now i can use any variable in my script. (3 Replies)
Hello,
I am trying to backup the whole folder which contains years of data and huge size, some files are > 10GB. I want keep the exact organization of the folder, except that for bigger file only part of it (say head -50, or simply only the name of the file) will be kept. Then the structure of the... (2 Replies)
Hi,
I have two files A and B and would like to use A as a filter. Like this:
File A.txt: Contains a list of IP addresses, each one occurring only once and in order:
10.0.0.1
10.0.0.2
10.0.0.4
10.0.0.8
File B.txt: Contains the same IP addresses with a corresponding ping time each (in... (16 Replies)
Discussion started by: Zooma
16 Replies
LEARN ABOUT ULTRIX
setlinebuf
setbuf(3s)setbuf(3s)Name
setbuf, setbuffer, setlinebuf, setvbuf - assign buffering to a stream
Syntax
#include <stdio.h>
void setbuf(stream, buf)
FILE *stream;
char *buf;
void setbuffer(stream, buf, size)
FILE *stream;
char *buf;
int size;
void setlinebuf(stream)
FILE *stream;
int setvbuf(stream, buf, type, size)
FILE *stream;
char *buf;
int type; size_t size;
Description
The three types of buffering available are unbuffered, block buffered, and line buffered. When an output stream is unbuffered, information
appears on the destination file or terminal as soon as written; when it is block buffered many characters are saved up and written as a
block; when it is line buffered characters are saved up until a new line is encountered or input is read from stdin. The routine may be
used to force the block out early. Normally all files are block buffered. For further information, see A buffer is obtained from upon the
first or on the file. If the standard stream stdout refers to a terminal it is line buffered. The standard stream stderr is always
unbuffered.
The routine is used after a stream has been opened but before it is read or written. The character array buf is used instead of an auto-
matically allocated buffer. If buf is the constant pointer NULL, input/output will be completely unbuffered. A manifest constant BUFSIZ
tells how big an array is needed:
char buf[BUFSIZ];
The routine, an alternate form of is used after a stream has been opened but before it is read or written. The character array buf whose
size is determined by the size argument is used instead of an automatically allocated buffer. If buf is the constant pointer NULL,
input/output will be completely unbuffered.
The routine is used to change stdout or stderr from block buffered or unbuffered to line buffered. Unlike and it can be used at any time
that the file descriptor is active.
The routine may be used after a stream has been opened but before it is read or written. Type determines how stream will be buffered.
Legal values for type, defined in stdio.h are:
_IOFBF causes input/output to be fully buffered.
_IOLBF causes output to be line buffered; the buffer will be flushed when a new line is written, the buffer is full, or input is
requested.
_IONBF causes input/output to be completely unbuffered.
If buf is not the NULL pointer, the array it points to will be used for buffering, instead of an automatically allocated buffer. The size
specifies the size of the buffer to be used. The constant BUFSIZ in <stdio.h> is suggested as a good buffer size. If input/output is
unbuffered, buf and size are ignored.
By default, output to a terminal is line buffered and all other input/output is fully buffered.
A file can be changed from unbuffered or line buffered to block buffered by using For further information, see A file can be changed from
block buffered or line buffered to unbuffered by using followed by with a buffer argument of NULL.
Restrictions
The standard error stream should be line buffered by default.
The and functions are not portable to non 4.2 BSD versions of UNIX.
See Alsomalloc(3), fclose(3s), fopen(3s), fread(3s), getc(3s), printf(3s), putc(3s), puts(3s).
setbuf(3s)