09-22-2005
Quote:
Originally Posted by toughguy2handle
M stuck ..
Stuck ? In that case, show us what you have...
9 More Discussions You Might Find Interesting
1. Programming
I'm implementing a shell in C that supports piping, output redirection, and background processing, and a few other commands. I was wondering how I'd go about implementing the output redirection. So, I'd open a file and I'd fork and execute the command. But how would I get stdout into the file? Any... (10 Replies)
Discussion started by: ununium
10 Replies
2. Programming
Hi,
I am implementing a shell in C, with the following problem...
Suppose the shell is invoked from the command line as
>> myshell < test.in > test.out 2>&1
I have to execute the commands in test.in and redirect them to test.out
How does one detect in the main function that the shell... (1 Reply)
Discussion started by: jacques83
1 Replies
3. Programming
Hi all
I am facing a problem with redirection. Its somewhat related to parsing.
I am following the following steps.
1. take the command and tokenize it.
2. if redirection is there then give it to redirection unit
3. if pipe is there give it to piping unit.
4. do until the command ends
... (0 Replies)
Discussion started by: mobile01
0 Replies
4. IP Networking
i have a client server connection steady and running... but the problem here is that the file transfer is very crude and succeptible to risks... so i want to implement ftp.. can anybody suggest a way to implement it or any book to read? (4 Replies)
Discussion started by: damn_bkb
4 Replies
5. UNIX for Dummies Questions & Answers
Hi
Can anybody tell the difference between Difference between cat , cat > , cat >> and touch command in UNIX?
Thanks (6 Replies)
Discussion started by: skyineyes
6 Replies
6. Shell Programming and Scripting
Hello,
So I sorted my file as I was supposed to:
sort -n -r -k 2 -k 1 file1 | uniq > file2
and when I wrote
> cat file2
in the command line, I got what I was expecting, but in the script itself
...
sort -n -r -k 2 -k 1 averages | uniq > temp
cat file2
It wrote a whole... (21 Replies)
Discussion started by: shira
21 Replies
7. Shell Programming and Scripting
I'm trying to add logging to an existing script which echos a number of lines to the screen. I've added a switch to the script that is going to suppress much of this output and put it in a file instead.
The way I envisioned it was like this:
$log would be set to either "" or the log files... (8 Replies)
Discussion started by: cheetobandito
8 Replies
8. Shell Programming and Scripting
i have following input file...
00290002STDR000000000000000000000000000EOD END TRANSACTION ^@^@^@^@^@^@^@^@^@^@^@^@^
00299998STDR070000000007000000000000000STANDING DEBITS ^@^@^@^@^@^@^@^@^@^@^@^@^... (1 Reply)
Discussion started by: sagarrd
1 Replies
9. Shell Programming and Scripting
Hello All,
I am trying a shell script for automatically login to test servers and pulling the output of top command from all using expect.
----snippet of code ---
#!/usr/bin/expect -f
#!/bin/bash
server1=10.251.222.51
server=("$server1")
i=1
for exp_server in ${server}; do
expect -c... (3 Replies)
Discussion started by: Renjesh
3 Replies
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)