Controlling a child's stdin/stdout (not working with scp) Post: 302403142

10 More Discussions You Might Find Interesting

1. Programming

Controlling child processes

Hello all, I am trying to create n child processes and control them from a parent process; say make child 3 print its pid and then child 5 do the same and some other stuff. Is there a way to accomplishing this after all the child processes are created via a call to fork(). Thank you, FG

2. Programming

C++ How to use pipe() & fork() with stdin and stdout to another program

Hi, Program A: uses pipe() I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using: * child -> dup2(fd, STDOUT_FILENO); -> execl("/path/PROGRAM B", "PROGRAM B", NULL); * parent -> char line; -> read(fd, line, 100); Question:...

3. Programming

stdout/stdin + flushing buffers

Hi all I've run into a snag in a program of mine where part of what I entered in at the start of run-time, instead of the current value within printf() is being printed out. After failing with fflush() and setbuf(), I tried the following approach void BufferFlusher() { int in=0;...

4. UNIX for Dummies Questions & Answers

Redirect stdin stdout to multiple files

Hi, i know how to a) redirect stdout and stderr to one file, b) and write to two files concurrently with same output using tee command Now, i want to do both the above together. I have a script and it should write both stdout and stderr in one file and also write the same content to...

5. Shell Programming and Scripting

can't close stdin/stdout in shell

#!/bin/sh exec 0</dev/null exec 1>/dev/null ls -l /proc/self/fd >&2 produces total 0 lr-x------ 1 tyler users 64 Feb 18 10:38 0 -> /proc/7886/fd lrwx------ 1 tyler users 64 Feb 18 10:38 1 -> /dev/pts/4 lrwx------ 1 tyler users 64 Feb 18 10:38 2 -> /dev/pts/4 I've verified the shell is...

6. Shell Programming and Scripting

Redirecting stdin/stdout to/from command from/to string

Hi, I am working on a project where I have to generate and execute nasm code on-the-fly. I generate the code in a file program.asm and then execute it.This output is to stdout which i redirect to an output file which i read back to compare results: system("nasm -f elf program.asm >...

7. Programming

read and write stdin/stdout in unix

Hi, i am using the below program to read from the standard input or to write to standard out put. i know that using highlevel functions this can be done better than what i have done here. i just want to know is there any other method by which i find the exact number of characters ( this...

8. UNIX for Dummies Questions & Answers

STDIN and STDOUT

Hallo, i have a script like: if ;then echo "OK" else echo "ERROR $2 is missing" fi; if ;then touch $2 fi; if ;then cat $1 | grep xy > $2

9. Shell Programming and Scripting

Controlling the Number of Child processes

I am trying to implement the below using Ksh script on a Lx machine. There is a file(input_file) with 100K records. For each of these records, certain script(process_rec) needs to be called with the record as input. Sequential processing is time-consuming and parallel processing would eat up...

10. Shell Programming and Scripting

[stdin / stdout] Strategies for redirecting outputs

Well.. let's say i need to write a pretty simple script. In my script i have 2 variables which can have value of 0 or 1. $VERBOSE $LOG I need to implement these cases: ($VERBOSE = 0 && $LOG = 0) => ONLY ERROR output (STDERR to console && STDOUT to /dev/null) ($VERBOSE = 1...

LEARN ABOUT FREEBSD

ssh-copy-id

SSH-COPY-ID(1)						    BSD General Commands Manual 					    SSH-COPY-ID(1)

NAME

     ssh-copy-id -- copy public keys to a remote host

SYNOPSIS

     ssh-copy-id [-lv] [-i keyfile] [-o option] [-p port] [user@]hostname

DESCRIPTION

     The ssh-copy-id utility copies public keys to a remote host's ~/.ssh/authorized_keys file (creating the file and directory, if required).

     The following options are available:

     -i file
	     Copy the public key contained in file.  This option can be specified multiple times and can be combined with the -l option.  If a
	     private key is specified and a public key is found then the public key will be used.

     -l      Copy the keys currently held by ssh-agent(1).  This is the default if the -i option was not specified.

     -o ssh-option
	     Pass this option directly to ssh(1).  This option can be specified multiple times.

     -p port
	     Connect to the specified port on the remote host instead of the default.

     -v      Pass -v to ssh(1).

     The remaining arguments are a list of remote hosts to connect to, each one optionally qualified by a user name.

EXIT STATUS

     The ssh-copy-id utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     To send a specific key to multiple hosts:
	   $ ssh-copy-id -i /path/to/keyfile.pub user@host1 user@host2 user@host3

HISTORY

     The ssh-copy-id utility was written by Eitan Adler <eadler@FreeBSD.org> as a drop-in replacement for an existing utility included with
     OpenSSH.

BSD
								 February 28, 2014							       BSD

10 More Discussions You Might Find Interesting

1. Programming

Controlling child processes

Discussion started by: forumGuy

2. Programming

C++ How to use pipe() & fork() with stdin and stdout to another program

Discussion started by: vvaidyan

3. Programming

stdout/stdin + flushing buffers

Discussion started by: JamesGoh

4. UNIX for Dummies Questions & Answers

Redirect stdin stdout to multiple files

Discussion started by: ysrini