The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
NAME pnmnorm – normalize the contrast in a Netbpm image SYNOPSIS pnmnorm [-bpercent N | -bvalue N] [-wpercent N | -wvalue N] [-keephues] [-brightmax] [ppmfile] All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one to designate an option. You may use either white space or an…
NAME pgmnoise – create a graymap made up of white noise SYNOPSIS pgmnoise width height DESCRIPTION Creates a portable graymap that is made up of random pixels with gray values in the range of 0 to PGM_MAXMAXVAL (depends on the compilation, either 255 or 65535). The graymap has a size of width * height pixels….
NAME pgmmorphconv – perform morphological convolutions: dilation, erosion SYNOPSIS pgmmorphconv [ -erode | -dilate | -open | -close ] templatefile [pgmfile] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option…
NAME pgmminkowski – compute Minkowski integral SYNOPSIS pgmminkowski pgmfile DESCRIPTION This program is part of Netpbm(1) pgmminkowski computes the 3 Minkowski integrals of a PGM image. The Minkowski integrals mathematically characterize the shapes in the image and hence are the basis of "morphological image analysis." Hadwiger’s theorem has it that these integrals are the only…
NAME pgmmedian – apply a median filter to a PGM file SYNOPSIS pgmmedian [-width=n] [-height=n] [-type=median_type] [-cutoff=int] [pnmfile] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from its…
NAME pgmmake – create a PGM image of a specified gray level and dimensions SYNOPSIS pgmmake [-maxval=maxval] graylevel width height All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one to designate an option. You may use either white space or an equals sign between an option…
NAME pgmkernel – generate a convolution kernel SYNOPSIS pgmkernel [ -weight w ] width [ height ] DESCRIPTION Generates a portable graymap array of size width x height (or width x width if height is not specified) to be used as a convolution file by pnmconvol. The data in the convolution array K are computed…
NAME pgmhist – print a histogram of the values in a portable graymap SYNOPSIS pgmhist [pgmfile] DESCRIPTION Reads a portable graymap as input. Prints a histogram of the gray values. SEE ALSO pgmnorm(1), pgm(5), ppmhist(1) AUTHOR Copyright (C) 1989 by Jef Poskanzer. Index
NAME pgmenhance – edge-enhance a portable graymap SYNOPSIS pgmenhance [-N] [pgmfile] DESCRIPTION Reads a portable graymap as input. Enhances the edges, and writes a portable graymap as output. The edge enhancing technique is taken from Philip R. Thompson’s "xim" program, which in turn took it from section 6 of "Digital Halftones by Dot Diffusion", D….
NAME pgmedge – edge-detect a portable graymap SYNOPSIS pgmedge [pgmfile] DESCRIPTION Reads a portable graymap as input. Outlines the edges, and writes a portable graymap as output. Piping the result through pgmtopbm -threshold and playing with the threshold value will give a bitmap of the edges. The edge detection technique used is to take the…
NAME pgmdeshadow – Deshadow a PGM image SYNOPSIS pgmdeshadow [pnmfile] DESCRIPTION This program is part of Netpbm(1) pgmdeshadow removes gray shadows from an image. This is useful for an image containing text, such as a scanned book pages, where a shadow typically appears near the book crease or near one side of the image. pgmdeshadow…
NAME pgmcrater – create cratered terrain by fractal forgery SYNOPSIS pgmcrater [-number n] [-height|-ysize s] [-width|-xsize s] [-gamma g] All options can be abbreviated to their shortest unique prefix. DESCRIPTION pgmcrater creates a PGM image which mimics cratered terrain. The PGM image is created by simulating the impact of a given number of craters…
NAME pgmbentley – Bentleyize a portable graymap SYNOPSIS pgmbentley [pgmfile] DESCRIPTION Reads a portable graymap as input. Performs The Bentley Effect, and writes a portable graymap as output. The Bentley Effect is described in "Beyond Photography" by Holzmann, chapter 4, photo 4. It’s a vertical smearing based on brightness. SEE ALSO pgmoil(1), ppmrelief(1), pgm(5) AUTHOR…
NAME pgmabel – create cross section using Abel Integration for Deconvolution SYNOPSIS pgmabel [-help] [-axis axis] [-factor factor] [-pixsize pixsize] [-left | -right] [-verbose] [filespec] DESCRIPTION This program is part of Netpbm(1) pgmabel reads as input a PGM image, which it assumes to be an image of a rotational symmetric transparent object. The image must…
NAME pgcenter – is the PostgreSQL administration console with top-like monitoring. SYNOPSIS pgcenter [OPTION]… [DBNAME [USERNAME]] DESCRIPTION PostgreSQL provides various statistics which includes information about tables, indexes, functions and other database objects and their usage. Moreover, statistics has information about connections, current queries and database operations (INSERT/DELETE/UPDATE). But most of this statistics are provided as…
NAME pgbench – run a benchmark test on PostgreSQL SYNOPSIS pgbench -i [option…] [dbname] pgbench [option…] [dbname] DESCRIPTION pgbench is a simple program for running benchmark tests on PostgreSQL. It runs the same sequence of SQL commands over and over, possibly in multiple concurrent database sessions, and then calculates the average transaction rate (transactions per…
NAME gawk – pattern scanning and processing language SYNOPSIS gawk [ POSIX or GNU style options ] -f program-file [ — ] file … gawk [ POSIX or GNU style options ] [ — ] program-text file … pgawk [ POSIX or GNU style options ] -f program-file [ — ] file … pgawk […
NAME pg_upgrade – upgrade a PostgreSQL server instance SYNOPSIS pg_upgrade -b oldbindir -B newbindir -d olddatadir -D newdatadir [option…] DESCRIPTION pg_upgrade (formerly called pg_migrator) allows data stored in PostgreSQL data files to be upgraded to a later PostgreSQL major version without the data dump/reload typically required for major version upgrades, e.g. from 8.4.7 to the…
NAME pg_top – display and update information about the top cpu PostgreSQL processes SYNOPSIS pg_top [ OPTIONS ] [ NUMBER ] DESCRIPTION pg_top displays the top processes on the system and periodically updates this information. Raw cpu percentage is used to rank the processes. If number is given, then the top number processes will be…
NAME pg_test_timing – measure timing overhead SYNOPSIS pg_test_timing [option…] DESCRIPTION pg_test_timing is a tool to measure the timing overhead on your system and confirm that the system time never moves backwards. Systems that are slow to collect timing data can give less accurate EXPLAIN ANALYZE results. OPTIONS pg_test_timing accepts the following command-line options: -d duration,…