Cannot read a file with read(fd, buffer, buffersize) function
I think every part of the program works fine except for the highlighted part. For some reason, c fails to read a file and btRead is assigned a -1 value. Of course, write function does not work either, because buff is probably empty. What could be the problem? Thanks in advance.
Last edited by vidyadhar85; 06-11-2009 at 11:04 PM..
Hi All,
I am trying to read output from a command. The output format is as follows:
Thursday 13 Mar 2008 Information
This is sample text
Friday 14 Mar 2008 Warning
This is one more sample text
First line contains informtation (date etc) and the 2nd line contains some information.
... (3 Replies)
I use fopen, fscanf, fclose to read a file. It can work well. since many files should be read, a function is created with the same code. But in the function, fscanf can not work well.
for example, the first line of the the file is: > filename
but the fscanf will give: 207/23/eee/34
it appears... (2 Replies)
Hi All,
I have to write one expect script to login to one system.
I am using
set timeout -1
match_max 100000
spawn ssh root@hostname
Now when I do spawn ssh to that host it send some warning message and one challenge
Challenge: 111-2345
I need to read this challenge value and has... (1 Reply)
Hi
I am new to Unix shell scripting. But i need help to slove the below issue.
Issue description:
I want to read table, view names and package names in a file
my plan to find the table name is : search "From" key word find the table or view
To find the packge name : Search "Package... (5 Replies)
Hi friends,
Hope everybody is fine. First have a look at my code, then we will talk about it.
$ cat copy.c
#include <stdio.h>
#define PERMS 0644 /* RW for owner, R for group, others */
#define BUFSIZE 1
char *progname;
int main(int argc,char * argv)
{
int f1, f2, n;
... (4 Replies)
Hello everyone,
Can someone please explain the input buffer behaviour for the read command in ksh93 on AIX?
I have 'googled' for weeks now, and did not find a satisfactory answer or solution to my dilemma.
I have the following code:
STTY=$(stty -g)
if ;then
stty -echo -icanon time 0 min... (1 Reply)
After some thought.
I am uncomfortable issuing my professors name where, there may be unintended side effects from any negative responses/feedback. Willing to re post if I can omit school / professor publicly, but can message moderator for validation? I am here for knowledge and understanding,... (1 Reply)
dear friends
I have a wrote a shell script which works like this.
1.) a command is executed and the log is moved in the file.
2.) this file is copied in to the other file.
3.) used a grep command to find a particular word.
4.) if a particular word is there then the script will go to next... (4 Replies)
Hi.
How can I create a history function? (By "read" command or so)
&
How can I configure a read command so that the arrow keys are not displayed so funny? (^[[A)
Thanks in advance. (4 Replies)
Hello,
I'm facing some problems with a barcode scanner from Cygnal Inc, model Sweda SL-20. Info from lsusb -v:
Bus 003 Device 003: ID 10c4:ff11 Cygnal Integrated Products, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
... (4 Replies)
Discussion started by: minharojr
4 Replies
LEARN ABOUT OPENSOLARIS
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS -raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO ppm(5)AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)