Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #825
Difficulty: Medium
The term API seems to appear for the first time in the article of Ira W. Cotton, Data structures and techniques for remote computer graphics, published in 1968.
True or False?
Linux & Unix Commands - Search Man Pages

ppm3d(1) [redhat man page]

ppm3d(1)						      General Commands Manual							  ppm3d(1)

NAME
ppm3d - convert two portable pixmap into a red/blue 3d glasses pixmap SYNOPSIS
ppm3d leftppmfile rightppmfile [horizontal_offset] DESCRIPTION
Reads two portable pixmaps as input. Produces a portable pixmap as output, with the images overlapping by horizontal_offset pixels in blue/red format. horizontal_offset defaults to 30 pixels. Pixmaps MUST be the same size. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1993 by David K. Drum. 2 November 1993 ppm3d(1)

Check Out this Related Man Page

pnmhistmap(1)						      General Commands Manual						     pnmhistmap(1)

NAME
pnmhistmap - draw a histogram for a PGM or PPM file SYNOPSIS
pnmhistmap [-black] [-white] [-max N] [-verbose] [pnmfile] DESCRIPTION
Reads a portable anymap as input, although bitmap (PBM) input produces an error message and no image. Produces an image showing a his- togram of the color (or gray) values in the input. A graymap (PGM) input produces a bitmap output. A pixmap (PPM) input produces pixmap output with three overlaid histograms: a red one for the red input, a green one for the green input, and a blue one for the blue input. The output is fixed in size: 256 pixels wide by 200 pixels high. OPTIONS
-black Ignores the count of black pixels when scaling the histogram. -white Ignores the count of white pixels when scaling the histogram. The -black and -white options, which can be used seperately or together, are useful for images with a large percentage of pixels whose value is zero or 255, which can cause the remaining histogram data to become unreadbaly small. Note that, for pixmap inputs, these options apply to all colors; if, for example, the input has a large number of bright-red areas, you will probably want to use the -white option. -max N Force the scaling of the histogram to use N as the largest-count value. This is useful for inputs with a large percentage of sin- gle-color pixels which are not black or white. -verbose Report the progress of making the histogram, including the largest-count value used to scale the output. All flags can be abbreviated to their shortest unique prefix. BUGS
Assumes maxval is always 255. Images with a smaller maxval will only use the lower-value side of the histogram. This can be overcome either by piping the input through "pnmdepth 255" or by cutting and scaling the lower-value side of the histogram. Neither is a particu- larly elegant solution. Should allow the output size to be specified. SEE ALSO
pgmhist(1), ppmhist(1), pgm(5), ppm(5) AUTHOR
Wilson H. Bent. Jr. (whb@usc.edu). 25 October 1993 pnmhistmap(1)

11 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Make all words begin with capital letter?

I need to use bash to convert sentences where all words start with a small letter into one where all words start with a capital letter. So that a string like: are utilities ready for hurricane sandy becomes: Are Utilities Ready For Hurricane Sandy (10 Replies)
Discussion started by: locoroco
10 Replies

2. UNIX for Dummies Questions & Answers

How to capture ^x,^y via bash script?

Hi I am new to this forum. Any please help me to capture ctrl x and ctrl y via a bash script. and please tell me how to clear the prompt via bash script BR Ramukumar M (4 Replies)
Discussion started by: ramukumar
4 Replies

3. Red Hat

Create an unconfigured VMware host from a template that is set to do firstboot --reconfig

I have an Oracle Linux 7.1 vsphere host built. It's be preconfigured with our security configurations. What I would like to do is unconfigure this host. Then set the host to do firstboot --reconfigure. how do I do that using /etc/sysconfig/firstboot? I've tried setting ... (10 Replies)
Discussion started by: os2mac
10 Replies

4. Shell Programming and Scripting

Retrieving previous command in a script

i know from the command line, the symbol $_ is used to get the last command that was run. however, id like to replicate this within a script. meaning, how do i do something like this: #!/bin/sh ps -ef | egrep talling StoreThisLastCommandA=$_ awk '/error/ {print $3}' /tmp/test... (5 Replies)
Discussion started by: SkySmart
5 Replies

5. UNIX for Advanced & Expert Users

Tar Command

hi folks, how to using tar with exclude directory and compress it using tar.Z i only know how to exclude dir only with this command below: tar -cvf /varios/restore/test.tar -X excludefile.txt /jfma/test1/ how to compress it using 1 command? Thanx Please use CODE tags as... (6 Replies)
Discussion started by: only
6 Replies

6. UNIX for Advanced & Expert Users

CentOS7 restoring file capabilities

Quite an obscure question I think. We have a rebuild process for remote sites that allows us to PXE rebuild a till (actually a PC with a touch screen and various fancy bits) running CentOS. The current CentOS5 tills work just fine with a tar image restore and some personalisation. Sadly,... (4 Replies)
Discussion started by: rbatte1
4 Replies

7. Docker

Docker learning Phase-I

Hello All, I had recently learnt a bit of Docker(which provides containerization process). Here are some of my learning points from it. Let us start first with very basic question: What is Docker: Docker is a platform for sysadmins and developers to DEPLOY, DEVELOP and RUN applications ... (7 Replies)
Discussion started by: RavinderSingh13
7 Replies

8. UNIX for Advanced & Expert Users

Issue with "rsh" on RedHat

Hi Folks, I feel that I should be posting this in the Unix for Dummies Forum and will probably wish I'd created an account and done just that - but here goes anyway. I have two identical servers both Dell R430's both running RedHat Enterprise Server 7.4 and the same kernel, both have the same... (16 Replies)
Discussion started by: gull04
16 Replies

9. UNIX for Beginners Questions & Answers

Package

Hi, What is installation package and how to create it? When we run: in AIX: installp package1 or in Linux rpm -ivh mypackage What is package1 or mypackage in the abov examples and how to create them and deploy them? I hope my question is clear enough. Thank you (2 Replies)
Discussion started by: big123456
2 Replies

10. UNIX for Advanced & Expert Users

Shopt -s histappend

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend (3 Replies)
Discussion started by: cokedude
3 Replies

11. Shell Programming and Scripting

[TIP] Processing YAML files with yq

After the success of the jq - tool for parsing and manipulating JSON-Data someone wrote a tool called yq, which aims to be the same for YAML, what jq is for JSON. Seems to work fine. I'll definitely give it a chance in future. Example YAML-File: --- !ruby/object:Puppet::Node::Facts ... (1 Reply)
Discussion started by: stomp
1 Replies

Featured Tech Videos