Shell Program , need help!!

10 More Discussions You Might Find Interesting

1. Homework & Coursework Questions

C shell program

1. I've have to write a shell program that accepts Ctrl+T (in linux os in c language) and should print out the current time and date to the screen. I've written the following code but i've to type ^T individual rather than pressing ctrl+T(^T) to get the output. : 2. How do i make the shell...

2. Homework & Coursework Questions

Shell program in C

Hi all, I have an assignment from school to write a shell program in linux. the idea is to exercise fork() and execv() functions.. the shell program is supposed to be the master and every command that the user prints will run in a new process. we also need to try running the command in every...

3. Shell Programming and Scripting

shell program

Iam having file 1 as wc -l file1 is 8 QWEERTYUU|7927836357398398398913 yuyuyu uyiuyuyuyuy yuiyuiyuyuyy FDHGFSHAJK|1476887897877777777771 iopwiiwpoi e . . . . I Need to read the abouve line in file1 so iam using the command as tail -n 8...

4. Shell Programming and Scripting

help with shell program

I want to print the value of variables a1, a2, a3 in for loop in the following program: a1=this a2=is a3=printed for((i=1;i<4;i++)) do var=a$i #w=`echo $var` e=${var} echo $e done But actually I get a1,a2,a3 as the output not the "this is printed" So the main question is if I...

5. Shell Programming and Scripting

very first shell program.

in the beginners book i have it gives an exercise to try. saying to make a script that examines the time. it should keep examining every second or so and say some sort of message. Can anyone help me get going. Thanks

6. Shell Programming and Scripting

shell program

hello, i have problem in awk filter in shell to concatenate two string plz send me a solution as soon as possible from jyoti ardeshana

7. Shell Programming and Scripting

shell program

How to write a shell script which takes 3 strings as positional parameters,first and second are file names and third is a directory.if the two files exist in `pwd` and they contain a specific pattern and their size is greater than 32 bytes,moves these files into directory?

8. Programming

Shell Program

I am programming the following simple shell program. It works for the most part, things like 'ls' and 'ps' work just fine. However when I add options, (example, ls -l) it does not execute the command. Also, I've been trying to add an "exit" command, so that I don't have to use the iterrupt; but...

9. Shell Programming and Scripting

C shell Program

Hellow every body I am trying to write a very simple script in an executable file as following if ($?PWD) then echo "OK" else echo "No" endif but I am getting error during execution in c shell as synthax error at line 4 , unexpected end of file Please advise

10. Shell Programming and Scripting

Help me with this Shell Program

Now, am in a very tight situation here. I really dont expect anyone to understand but please, try your best. am trying to right a program that goes back to the previous entry to correct a mistake. heres what am trying to do. i write a program like this Name : James Holgston...

LEARN ABOUT OSX

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)

Shell Programming and Scripting