Commands tagged ssh-keygen sorted by votes

Commands tagged ssh-keygen (7)

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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
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

Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

This is the best way to fix this issue on OS X. If you don't have homebrew installed, now is the perfect time to fix that too. ;-) see http://crosstown.coolestguidesontheplanet.com/os-x/40-setting-up-os-x-lion-to-plug-into-homebrew-package-manager Show Sample Output

brew install ssh-copy-id; ssh-copy-id user@host

MrWonderful · 2013-11-08 16:46:51 24

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 27
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 9
Automatd ssh public key setup without ssh-copy-id

Some servers don't have ssh-copy-id, this works in those cases. It will ask for the destination server, this can be IP, hostname, or user@hostname if different from current user. Ssh keygen will let you know if a pubkey already exists on your system and you can opt to not overwrite it.
This is sample output - yours may be different.
-2

echo 'Host or User@Host?:'; read newserver && ssh-keygen -N "" -t rsa -f ~/.ssh/id_rsa ; ssh $newserver cat <~/.ssh/id_rsa.pub ">>" ~/.ssh/authorized_keys ; ssh $newserver

alf · 2010-05-07 06:24:53 5

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use the previous commands params in the current command

Here the !!:1 will take the first parameter from the previous command. This can be used in conjunction with other history commands like ! and so on.

Function that outputs dots every second until command completes

Very useful in shell scripts because you can run a task nicely in the background using job-control and output progress until it completes. Here's an example of how I use it in backup scripts to run gpg in the background to encrypt an archive file (which I create in this same way). $! is the process ID of the last run command, which is saved here as the variable PI, then sleeper is called with the process id of the gpg task (PI), and sleeper is also specified to output : instead of the default . every 3 seconds instead of the default 1. So a shorter version would be sleeper $!; The wait is also used here, though it may not be needed on your system. $ echo ">>> ENCRYPTING SQL BACKUP" $ gpg --output archive.tgz.asc --encrypt archive.tgz 1>/dev/null & $ PI=$!; sleeper $PI ":" 3; wait $PI && rm archive.tgz &>/dev/null Previously to get around the $! not always being available, I would instead check for the existance of the process ID by checking if the directory /proc/$PID existed, but not everyone uses proc anymore. That version is currently the one at http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html but I plan on upgrading to this new version soon.

Shell recorder with replay

If you provide the option -t to the script command and redirect stderr into a file, the timing information on what is going on on the terminal, is also stored. You can replay the session via the scriptreplay command, where you can also provide a speedup factor (see the man page for details). Great for demonstration purposes ...

gvim in full screen (execute again to toggle full screen on/off)

Only under linux. Requires Gvim compiled with "clientserver" functionality and wmctrl command installed on system. Instead of servername can be used the current edited file name. Put it in a function and map it for get rid of "Press a key" after execution.

Rename files in batch

convert single digit to double digits

works only in zsh, requires autoload zmv

Generate list of words and their frequencies in a text file.

Print a row of 50 hyphens

essentially the ruby one, but perhaps has a larger installed base

Find

A lot of X applications accept --geometry parameter so that you can set application size and position. But how can you figure out the exact arguments for --geometry? Launch an application, resize and reposition its window as needed, then launch xwininfo in a terminal an click on the application window. You will see some useful window info including its geometry.

Say something out loud

Whatever arguments you pass will be spoken out loud. (Put it in a script or shell function.)

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Commands tagged ssh-keygen (7)

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