Sponsored Content
Top Forums Programming Controlling a child's stdin/stdout (not working with scp) Post 302402835 by Corona688 on Wednesday 10th of March 2010 07:01:43 PM
Old 03-10-2010
Yes, it does, and no, it won't let you, and that's for a reason -- stored passwords are not only inherently dangerous but completely unnecessary. Use shared keys, that's what they're there for. There's instructions for them plastered all over the internet and you can use them in ways that obey the spirit and letter of that rule -- give the shared key a password and use ssh-agent. That way you need to type the password once, to get the key, after which you can use the key to login automatically until your ssh-agent session finishes.
 

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 (23 Replies)
Discussion started by: forumGuy
23 Replies

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:... (2 Replies)
Discussion started by: vvaidyan
2 Replies

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;... (9 Replies)
Discussion started by: JamesGoh
9 Replies

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... (8 Replies)
Discussion started by: ysrini
8 Replies

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... (10 Replies)
Discussion started by: Corona688
10 Replies

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 >... (5 Replies)
Discussion started by: doc_cypher
5 Replies

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... (3 Replies)
Discussion started by: MrUser
3 Replies

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 (1 Reply)
Discussion started by: eightball
1 Replies

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... (2 Replies)
Discussion started by: APT_3009
2 Replies

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... (5 Replies)
Discussion started by: Marmz
5 Replies
SSH-ADD(1)						    BSD General Commands Manual 						SSH-ADD(1)

NAME
ssh-add -- adds private key identities to the authentication agent SYNOPSIS
ssh-add [-cDdLlXx] [-t life] [file ...] ssh-add -s pkcs11 ssh-add -e pkcs11 DESCRIPTION
ssh-add adds private key identities to the authentication agent, ssh-agent(1). When run without arguments, it adds the files ~/.ssh/id_rsa, ~/.ssh/id_dsa, ~/.ssh/id_ecdsa and ~/.ssh/identity. After loading a private key, ssh-add will try to load corresponding certificate informa- tion from the filename obtained by appending -cert.pub to the name of the private key file. Alternative file names can be given on the com- mand line. If any file requires a passphrase, ssh-add asks for the passphrase from the user. The passphrase is read from the user's tty. ssh-add retries the last passphrase if multiple identity files are given. The authentication agent must be running and the SSH_AUTH_SOCK environment variable must contain the name of its socket for ssh-add to work. The options are as follows: -c Indicates that added identities should be subject to confirmation before being used for authentication. Confirmation is performed by the SSH_ASKPASS program mentioned below. Successful confirmation is signaled by a zero exit status from the SSH_ASKPASS program, rather than text entered into the requester. -D Deletes all identities from the agent. -d Instead of adding identities, removes identities from the agent. If ssh-add has been run without arguments, the keys for the default identities will be removed. Otherwise, the argument list will be interpreted as a list of paths to public key files and matching keys will be removed from the agent. If no public key is found at a given path, ssh-add will append .pub and retry. -e pkcs11 Remove keys provided by the PKCS#11 shared library pkcs11. -L Lists public key parameters of all identities currently represented by the agent. -l Lists fingerprints of all identities currently represented by the agent. -s pkcs11 Add keys provided by the PKCS#11 shared library pkcs11. -t life Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in sshd_config(5). -X Unlock the agent. -x Lock the agent with a password. ENVIRONMENT
DISPLAY and SSH_ASKPASS If ssh-add needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If ssh-add does not have a terminal associated with it but DISPLAY and SSH_ASKPASS are set, it will execute the program specified by SSH_ASKPASS and open an X11 window to read the passphrase. This is particularly useful when calling ssh-add from a .xsession or related script. (Note that on some machines it may be necessary to redirect the input from /dev/null to make this work.) SSH_AUTH_SOCK Identifies the path of a UNIX-domain socket used to communicate with the agent. FILES
~/.ssh/identity Contains the protocol version 1 RSA authentication identity of the user. ~/.ssh/id_dsa Contains the protocol version 2 DSA authentication identity of the user. ~/.ssh/id_ecdsa Contains the protocol version 2 ECDSA authentication identity of the user. ~/.ssh/id_rsa Contains the protocol version 2 RSA authentication identity of the user. Identity files should not be readable by anyone but the user. Note that ssh-add ignores identity files if they are accessible by others. EXIT STATUS
Exit status is 0 on success, 1 if the specified command fails, and 2 if ssh-add is unable to contact the authentication agent. SEE ALSO
ssh(1), ssh-agent(1), ssh-keygen(1), sshd(8) AUTHORS
OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. BSD
October 28, 2010 BSD
All times are GMT -4. The time now is 01:15 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy