I tried to run a command which simply generates SSH key with out prompting password.
After several trails , got the below command to run the script :
Code:
ssh-keygen -t rsa -N "" -f id_rsa
-N "" tells it to use an empty passphrase (the same as two of the enters in an interactive script)
-f id_rsa tells it to store the key into id_rsa.
The whole thing runs without you needing to supply any enter keys.
Moderator's Comments:
Please wrap up your samples in code tags.
Last edited by RavinderSingh13; 01-09-2019 at 08:58 AM..
To anyone who can help greetings,
I am a beginner at Unix shell scripting and am taking a class.
The assignment question is as follows:
use a command-line tool named "itstat" which will display the resolution of an image file and some other lines of information. It accepts a list of image... (1 Reply)
To anyone who can help greetings,
I am a beginner at Unix shell scripting.
I need to know how to use the command line tool "itstat".
I understand it's application, however I cannot find any additional information.
Any assistance will be greatly appreciated. (3 Replies)
Hi all!
I'm a newbie to shell scripting.
I want to create a script that will store a line from a text file in a variable so I can then use it to open firefox with that text in the address bar (the text file contains a list of addresses).
I have tried the following:
#!/bin/sh
a='sed -n 2p... (2 Replies)
Hi,
I am assaigning the output to the variable outp and when i try to loop thru the variable i see the original content $OUTPUT also in the array outp.
I dont want to have the original content in the array outp.
Please reply.
outp=$(echo $OUTPUT | awk '{FS = "|"}{
for(i=0;i<NF;i++)... (8 Replies)
HI all,
I am attempting to use the scp statemet in a shell script that I am writing
I need to have the user of the script enter a password at the time of the shell script running.I have the following questions?
1) how do i disable the automatic text echo when the user is entering the... (1 Reply)
Testing for the presence/absence of a pattern in a file, using /bin/sh:
while read a;
do
b="${a##*pattern*}";
;
done < file
This returns 0 if there's a match. That signal ($?) can then be used outside the loop.
However this method reads through the whole file, even if the match... (2 Replies)
Hello,
I have a scenario for which I am trying to write a shell script and I have a question regarding the same. Here's the situation:
I am trying to copy a directory which consists of a few sub-directories and .c and .dat extension files say n number of times so that the copied file have... (3 Replies)
Hi,
I need to write a script that runs a series of commands in multiple subfolders. The problem is that I dont want to change directory for every folder. So this is why I thought to use a master script to activate the smaller ones.
So, is there a way to command other scripts to open in... (9 Replies)
Hi guys,
I am wanting to create a script that will logon to HackThisSite.org and complete Programming Mission 11. You can find a link to this mission here for your reference:
www hackthissite org/missions/prog/11/
The following is what I have so far:
#!/bin/bash
USER="myUsername"... (0 Replies)
hey i have to connect to sql through shell script , then store the value of the query in a variable and then compare it after some time after running a process.
i have used this code but it is not working.
#!/bin/sh
Val = (sqlplus -s rte/rted2@rel76d2 <<!
SELECT MAX(STAT_ID) FROM CVT_STATS;... (3 Replies)
Discussion started by: ramsavi
3 Replies
LEARN ABOUT REDHAT
ssh-keygen
SSH-KEYGEN(1) BSD General Commands Manual SSH-KEYGEN(1)NAME
ssh-keygen -- authentication key generation, management and conversion
SYNOPSIS
ssh-keygen [-q] [-b bits] -t type [-N new_passphrase] [-C comment] [-f output_keyfile]
ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]
ssh-keygen -i [-f input_keyfile]
ssh-keygen -e [-f input_keyfile]
ssh-keygen -y [-f input_keyfile]
ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]
ssh-keygen -l [-f input_keyfile]
ssh-keygen -B [-f input_keyfile]
ssh-keygen -D reader
ssh-keygen -U reader [-f input_keyfile]
DESCRIPTION
ssh-keygen generates, manages and converts authentication keys for ssh(1). ssh-keygen can create RSA keys for use by SSH protocol version 1
and RSA or DSA keys for use by SSH protocol version 2. The type of key to be generated is specified with the -t option.
Normally each user wishing to use SSH with RSA or DSA authentication runs this once to create the authentication key in $HOME/.ssh/identity,
$HOME/.ssh/id_dsa or $HOME/.ssh/id_rsa. Additionally, the system administrator may use this to generate host keys, as seen in /etc/rc.
Normally this program generates the key and asks for a file in which to store the private key. The public key is stored in a file with the
same name but ``.pub'' appended. The program also asks for a passphrase. The passphrase may be empty to indicate no passphrase (host keys
must have an empty passphrase), or it may be a string of arbitrary length. A passphrase is similar to a password, except it can be a phrase
with a series of words, punctuation, numbers, whitespace, or any string of characters you want. Good passphrases are 10-30 characters long,
are not simple sentences or otherwise easily guessable (English prose has only 1-2 bits of entropy per character, and provides very bad
passphrases), and contain a mix of upper and lowercase letters, numbers, and non-alphanumeric characters. The passphrase can be changed
later by using the -p option.
There is no way to recover a lost passphrase. If the passphrase is lost or forgotten, a new key must be generated and copied to the corre-
sponding public key to other machines.
For RSA1 keys, there is also a comment field in the key file that is only for convenience to the user to help identify the key. The comment
can tell what the key is for, or whatever is useful. The comment is initialized to ``user@host'' when the key is created, but can be changed
using the -c option.
After a key is generated, instructions below detail where the keys should be placed to be activated.
The options are as follows:
-b bits
Specifies the number of bits in the key to create. Minimum is 512 bits. Generally 1024 bits is considered sufficient, and key sizes
above that no longer improve security but make things slower. The default is 1024 bits.
-c Requests changing the comment in the private and public key files. This operation is only supported for RSA1 keys. The program will
prompt for the file containing the private keys, for the passphrase if the key has one, and for the new comment.
-e This option will read a private or public OpenSSH key file and print the key in a 'SECSH Public Key File Format' to stdout. This
option allows exporting keys for use by several commercial SSH implementations.
-f filename
Specifies the filename of the key file.
-i This option will read an unencrypted private (or public) key file in SSH2-compatible format and print an OpenSSH compatible private
(or public) key to stdout. ssh-keygen also reads the 'SECSH Public Key File Format'. This option allows importing keys from several
commercial SSH implementations.
-l Show fingerprint of specified public key file. Private RSA1 keys are also supported. For RSA and DSA keys ssh-keygen tries to find
the matching public key file and prints its fingerprint.
-p Requests changing the passphrase of a private key file instead of creating a new private key. The program will prompt for the file
containing the private key, for the old passphrase, and twice for the new passphrase.
-q Silence ssh-keygen. Used by /etc/rc when creating a new key.
-y This option will read a private OpenSSH format file and print an OpenSSH public key to stdout.
-t type
Specifies the type of the key to create. The possible values are ``rsa1'' for protocol version 1 and ``rsa'' or ``dsa'' for protocol
version 2.
-B Show the bubblebabble digest of specified private or public key file.
-C comment
Provides the new comment.
-D reader
Download the RSA public key stored in the smartcard in reader.
-N new_passphrase
Provides the new passphrase.
-P passphrase
Provides the (old) passphrase.
-U reader
Upload an existing RSA private key into the smartcard in reader.
FILES
$HOME/.ssh/identity
Contains the protocol version 1 RSA authentication identity of the user. This file should not be readable by anyone but the user.
It is possible to specify a passphrase when generating the key; that passphrase will be used to encrypt the private part of this file
using 3DES. This file is not automatically accessed by ssh-keygen but it is offered as the default file for the private key. ssh(1)
will read this file when a login attempt is made.
$HOME/.ssh/identity.pub
Contains the protocol version 1 RSA public key for authentication. The contents of this file should be added to
$HOME/.ssh/authorized_keys on all machines where the user wishes to log in using RSA authentication. There is no need to keep the
contents of this file secret.
$HOME/.ssh/id_dsa
Contains the protocol version 2 DSA authentication identity of the user. This file should not be readable by anyone but the user.
It is possible to specify a passphrase when generating the key; that passphrase will be used to encrypt the private part of this file
using 3DES. This file is not automatically accessed by ssh-keygen but it is offered as the default file for the private key. ssh(1)
will read this file when a login attempt is made.
$HOME/.ssh/id_dsa.pub
Contains the protocol version 2 DSA public key for authentication. The contents of this file should be added to
$HOME/.ssh/authorized_keys on all machines where the user wishes to log in using public key authentication. There is no need to keep
the contents of this file secret.
$HOME/.ssh/id_rsa
Contains the protocol version 2 RSA authentication identity of the user. This file should not be readable by anyone but the user.
It is possible to specify a passphrase when generating the key; that passphrase will be used to encrypt the private part of this file
using 3DES. This file is not automatically accessed by ssh-keygen but it is offered as the default file for the private key. ssh(1)
will read this file when a login attempt is made.
$HOME/.ssh/id_rsa.pub
Contains the protocol version 2 RSA public key for authentication. The contents of this file should be added to
$HOME/.ssh/authorized_keys on all machines where the user wishes to log in using public key authentication. There is no need to keep
the contents of this file secret.
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.
SEE ALSO ssh(1), ssh-add(1), ssh-agent(1), sshd(8)
J. Galbraith and R. Thayer, SECSH Public Key File Format, draft-ietf-secsh-publickeyfile-01.txt, March 2001, work in progress material.
BSD September 25, 1999 BSD
01-09-2019
