Commands using ssh-keygen sorted by votes

Commands using ssh-keygen (31)

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Remove a line in a text file. Useful to fix

In this case it's better do to use the dedicated tool
This is sample output - yours may be different.
45

ssh-keygen -R <the_offending_host>

bunam · 2010-07-11 19:37:24 17
Transfer SSH public key to another machine in one step

This command sequence allows simple setup of (gasp!) password-less SSH logins. Be careful, as if you already have an SSH keypair in your ~/.ssh directory on the local machine, there is a possibility ssh-keygen may overwrite them. ssh-copy-id copies the public key to the remote host and appends it to the remote account's ~/.ssh/authorized_keys file. When trying ssh, if you used no passphrase for your key, the remote shell appears soon after invoking ssh user@host.
This is sample output - yours may be different.
20

ssh-keygen; ssh-copy-id user@host; ssh user@host

bwoodacre · 2009-03-18 07:59:33 17
Remove a line from a file using sed (useful for updating known SSH server keys when they change)

remove the host for the .ssh/know_host file
This is sample output - yours may be different.
16

ssh-keygen -R <thehost>

bunam · 2012-01-16 21:07:44 15

Will return the SSH server key information for each host you have in your ~/.ssh/known_hosts file, including key size, key fingerprint, key IP address or domain name, and key type. Show Sample Output

ssh-keygen -l -f ~/.ssh/known_hosts

atoponce · 2010-12-05 04:03:07 7

Remove invalid host keys from ~/.ssh/known_hosts

Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.
This is sample output - yours may be different.
9

ssh-keygen -R \[localhost\]:8022

Sekenre · 2009-02-05 11:48:09 113
Remove invalid key from the known_hosts file for the IP address of a host

Quick shortcut if you know the hostname and want to save yourself one step for looking up the IP address separately.
This is sample output - yours may be different.
5

ssh-keygen -R `host hostname | cut -d " " -f 4`

flart · 2009-09-23 14:58:28 8
Get ssh server fingerprints

Get your server's fingerprints to give to users to verify when they ssh in. Publickey locations may vary by distro. Fingerprints should be provided out-of-band. Show Sample Output
This is sample output - yours may be different.
```
2048 b6:de:15:9b:00:c1:f5:f8:68:g9:43:9b:94:81:c5:c9 /etc/ssh/ssh_host_rsa_key.pub (RSA)
1024 e5:60:ff:6a:1f:0f:01:d0:14:6b:89:fa:64:f3:ae:2a /etc/ssh/ssh_host_dsa_key.pub (DSA)
```
4

ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub && ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub

Mikelifeguard · 2009-10-26 17:52:41 4
Change SSH RSA passphrase

Protects your secret identity with a passphrase. OSX 10.6 automatically does key forwarding and can store the passphrase in the keychain. For other OSes, use ssh -A or set ForwardAgent in ssh_config to enable forwarding. Then use ssh-agent/ssh-add. Show Sample Output
This is sample output - yours may be different.
```
Key has comment 'id_rsa'
Enter new passphrase (empty for no passphrase): 
Enter same passphrase again:
Your identification has been saved with the new passphrase.
```
3

ssh-keygen -f ~/.ssh/id_rsa -p

darkfader · 2010-07-19 12:53:35 6
Generate SSH public key from the private key
This is sample output - yours may be different.
3

ssh-keygen -y -f privatekey.pem > publickey.pem

elio · 2019-02-08 09:00:44 38
remove hostname from known_hosts
This is sample output - yours may be different.
2

ssh-keygen -R hostname

harleywastaken · 2011-02-01 18:26:11 8
Remove invalid key from the known_hosts file for the IP address of a host

Quick shortcut if you know the hostname and want to save yourself one step for looking up the IP address separately.
This is sample output - yours may be different.
2

ssh-keygen -R $(dig +short host.domain.tld)

atoponce · 2012-01-19 15:08:50 4
Check SSH public and private keys matching

Tested in bash4
This is sample output - yours may be different.
2

diff <(ssh-keygen -y -f ~/.ssh/id_rsa) <(cut -d' ' -f1,2 ~/.ssh/id_rsa.pub)

fernandomerces · 2013-08-31 14:01:33 8
Validate openssh key & print checksum
This is sample output - yours may be different.
1

ssh-keygen -l -f [pubkey] | awk '{print $2}' | tr -ds ':' '' | egrep -ie "[a-f0-9]{32}"

wwest4 · 2009-02-05 17:42:30 17
test moduli file generated for openssh

this command test the moduli file generated by the command ssh-keygen -G /tmp/moduli-2048.candidates -b 2048 . The test can be long depend of your cpu power , around 5 minutes to 30 minutes
This is sample output - yours may be different.
1

ssh-keygen -T moduli-2048 -f /tmp/moduli-2048.candidates

eastwind · 2010-01-29 19:35:21 4
Append a pub key from pem file and save in remote server accessing with another key

Useful if you need to add another key and you using pem files (typical in AWS EC2 Instances). If you use it in EC2 instances, remember that password authentication is disabled, so you have to use the first key generated when you generated the instance
This is sample output - yours may be different.
1

ssh-keygen -y -f user-key.pem | ssh user@host -i already_on_remote_server_key.pem 'cat >> ~/.ssh/authorized_keys'

fromthestone · 2019-02-21 08:37:31 33
Convert an ssh2 public key to openssh format
This is sample output - yours may be different.
0

ssh-keygen -i -f $sshkeysfile >> authorized_keys

wwest4 · 2009-02-05 17:32:02 31
generate the moduli file for openssh if lost

if you lost your moduli file in openssh server side you need generate new one with this command then test if the number generated can be used with ssh-keygen -T moduli-2048 -f /tmp/moduli-2048.candidates
This is sample output - yours may be different.
0

ssh-keygen -G /tmp/moduli-2048.candidates -b 2048

eastwind · 2010-01-29 19:33:23 4
Put at the end of the rsa public key an comment(default value is the hostname)

Now at the end of the rsa.pub file, there is our comment like= ".................peXeuE0ytJgpQcXeR5aHlfLa8dAt0obasd hello@world"
This is sample output - yours may be different.
0

ssh-keygen -C hello@world

aykut · 2011-07-06 18:02:32 5
Remove invalid key from the known_hosts file for the IP address of a host

Works for multiple hosts (such as www.google.com) and/or wrong hosts. Show Sample Output
This is sample output - yours may be different.
```
/home/USER/.ssh/known_hosts updated.
Original contents retained as /home/USER/.ssh/known_hosts.old
/home/USER/.ssh/known_hosts updated.
Original contents retained as /home/USER/.ssh/known_hosts.old
```
0

for HOSTTOREMOVE in $(dig +short host.domain.tld); do ssh-keygen -qR $HOSTTOREMOVE; done

bibe · 2012-01-19 15:57:10 5
Validate openssh key & print checksum
This is sample output - yours may be different.
0

ssh-keygen -l -f [pubkey] | cut -d ' ' -f 2 | tr -ds '\n:' ''

zdouglas · 2012-07-24 15:40:51 5
Check SSH fingerprints

Find all private keys and dump their fingerprints. Show Sample Output
This is sample output - yours may be different.
```
id_rsa: 2048 aa:bb:cc:dd:ee:ff:00:11:22:33:44:55:66:77:88:99  id@base-id (RSA)
other: 2048 00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff  id@OTHER.com (RSA)
```
0

for id in `ls -1 ~/.ssh | grep -v "authorized\|known_hosts\|config\|\."` ; do echo -n "$id: " ; ssh-keygen -l -f .ssh/$id ; done

drockney · 2014-04-16 14:12:20 26
Have a user generate an ssh key if it does not already exist and spit it in bold red to stdout
This is sample output - yours may be different.
0

if [ -e ~/.ssh/id_rsa.pub ] ; then echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m' ; else ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa -t rsa -P ""; echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m'; fi

sdoradus · 2014-12-01 03:48:19 8
Generate SSH key

This is just a default ssh-keygen command. Prompts for a password that you can use to secure the keys more and uses a higher bit value than the default along with naming the key something other than id_rsa for better file identification.
This is sample output - yours may be different.
0

ssh-keygen -t rsa -b 4096 -f ~/.ssh/<ROLE>_rsa -C "Comment goes here"

krizzo · 2015-01-11 17:52:21 8
Creates a new ssh key, using the provided email as a label
This is sample output - yours may be different.
0

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

j4ps · 2016-01-12 02:10:42 10
ssh-keygen -b 4048 -t rsa -C "comment"

Generating ssh key then need to copy public key in to /root/.ssh/authorized_keys
This is sample output - yours may be different.
0

ssh-keygen -b 4048 -t rsa -C "comment"

erez83 · 2016-02-03 09:37:39 11
1 2 >

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Lists all listening ports together with the PID of the associated process

The PID will only be printed if you're holding a root equivalent ID.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Cut/Copy brackets or parentheses on vim (in normal mode)

We have for example : func () { echo FOO echo BAR } Place the cursor under a bracket and press d + %. It will cut everything inside and the brackets. It let : func () You can copy text with y + %

Convert all files for iPhone with HandbrakeCLI

Find the package that installed a command

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Counting the source code's line numbers C/C++ Java

Count your source and header file's line numbers. This ignores blank lines, C++ style comments, single line C style comments. This will not ignore blank lines with tabs or multiline C style comments.

Tell Analytics to fuck itself.

See http://code.google.com/apis/analytics/docs/concepts/gaConceptsCookies.html if you are unclear about the Google Analytics cookie system. If Firefox is your daily browser, be a good Orwellian and run this command regularly. If you see, 'SQL error near line 1: database is locked', close Firefox and run again.

check open ports without netstat or lsof

list files recursively by size

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Commands using ssh-keygen (31)

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