Pipe Problem Post: 95306

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Wierd pipe problem

I have encountered a strange problem dealing with pipes and forking. The program basicaly does this: cat file | tbl | eqn | groff Now, I have a parent process that forks children that that exec the stuff that they should. The pipes defined in the parent are the ones used. The chain goes...

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I use read often in scripts to filter the right part into a variable like: $ print "abc cde efg" | read k l ; print "k=$k, l=$l" k=, l= This works on linux and unix versions I work with. On OSX 10.4 this doesn't work. I found a workaround but would like to know why the original line...

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Problem in read() from a pipe

Hi, Can any one please help me with this. Am struggling hard to get a solution. I am doing telnet through a C program and getting the stdout file descriptor of the remote machine to pipe. read() function is getting data, But whenl it receives SOH character ie. ^A ( Start of heading = Console...

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Could anyone tell me whats wrong whit this piping? the commands that they execute are correct. the command I am trying is ls|wc. Both processes go to the right if statement. for(i=0;i<argc;i++){ if(i==0&&argc>1){//first command if(pipe(pipa1)==-1) ...

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problem using a pipe to grep

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problem with pipe operator

hi i am having issues with extra pipe. i have a data file and i need to remove the extra pipe in the(example 4th and 7thline) in datafile. there are many other line and filed like this which i need to remove from files. The sample data is below: 270 31|455004|24/03/2010|0001235|72 271...

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pipe() and poll() problem in C

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The problem of pipe

Hi,guys: I want to use c to implement a pipe. For example: ps auxwww | grep fred | more I forked three child processes. Each is responsible for each command, and pipe to next one. for(i=0;i<2;i++) pipe(fd) if(child==1) // child 1 { close(1) dup2(fd,1) close(fd) }...

LEARN ABOUT MOJAVE

httppower

httppower(8)							     powerman							      httppower(8)

NAME

       httppower - communicate with HTTP based power distribution units

SYNOPSIS

       httppower [--url URL]

DESCRIPTION

       httppower  is  a  helper program for powerman which enables it to communicate with HTTP based power distribution units.	It is run interac-
       tively by the powerman daemon.

OPTIONS

       -u, --url URL
	      Set the base URL.

INTERACTIVE COMMANDS

       The following commands are accepted at the httppower> prompt:

       auth user:pass
	      Authenticate to the base URL with specified user and password, using ``basic'' HTTP authentication which sends the user and password
	      over the network in plain text.

       seturl URL
	      Set the base URL.  Overrides the command line option.

       get [URL-suffix]
	      Send an HTTP GET to the base URL with the optional URL-suffix appended.

       post [URL-suffix] key=val[&key=val]...
	      Send an HTTP POST to the base URL with the optional URL-suffix appended, and key-value pairs as argument.

FILES

       /usr/sbin/httppower
       /etc/powerman/powerman.conf

ORIGIN

       PowerMan was originally developed by Andrew Uselton on LLNL's Linux clusters.  This software is open source and distributed under the terms
       of the GNU GPL.

SEE ALSO

       powerman(1), powermand(8), httppower(8), plmpower(8), vpcd(8), powerman.conf(5), powerman.dev(5), powerman-devices(7).

       http://sourceforge.net/projects/powerman

powerman-2.3.5							    2009-02-09							      httppower(8)

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