Commands by 0x89

Commands by 0x89 (5)

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directly ssh to host B that is only accessible through host A

Of course you need to be able to access host A for this ;-)
This is sample output - yours may be different.
40

ssh -t hostA ssh hostB

0x89 · 2009-08-27 21:35:19 34
scp a good script from host A which has no public access to host C, but with a hop by host B

Stop tormenting the poor animal cat! Also you should not that you need a private key not protected by a passphrase on middlehost that grants you access to securehost..
This is sample output - yours may be different.
0

ssh middlehost "ssh -a root@securehost '> nicescript'" < nicescript

0x89 · 2009-08-26 20:25:12 5
Recursive replace of directory and file names in the current directory.

no grep, no perl, no pipe. even better in zsh/bash4: for i in **/*oldname*; do "mv $i ${i/oldname/newname/}"; done No find, no grep, no perl, no pipe
This is sample output - yours may be different.
1

for i in `find -name '*oldname*'`; do "mv $i ${i/oldname/newname/}"; done

0x89 · 2009-07-26 21:58:16 5
ssh autocomplete

Stop tormenting the poor animal cat. See http://sial.org/howto/shell/useless-cat/. Edit: replaced sort | uniq by sort -u
This is sample output - yours may be different.
11

complete -W "$(echo $(grep '^ssh ' .bash_history | sort -u | sed 's/^ssh //'))" ssh

0x89 · 2009-07-25 23:07:25 57
Get all IPs via ifconfig

and, a lot uglier, with sed: ifconfig | sed -n '/inet addr:/s/[^:]\+:$\S\+$.*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..
This is sample output - yours may be different.
1

ifconfig | awk -F':| +' '/ddr:/{print $4}'

0x89 · 2009-07-25 22:51:08 4

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Check for login failures and summarize

This command checks for the number of times when someone has tried to login to your server and failed. If there are a lot, then that user is being targeted on your system and you might want to make sure that user either has remote logins disabled, or has a strong password, or both. If your output has an "invalid" line, it is a summary of all logins from users that don't exist on your system.

Exclude inserting a table from a sql import

Starting with a large MySQL dump file (*.sql) remove any lines that have inserts for the specified table. Sometimes one or two tables are very large and uneeded, eg. log tables. To exclude multiple tables you can get fancy with sed, or just run the command again on subsequently generated files.

Start a new command in a new screen window

If you are already running screen then you often want to start a command in a fresh window. You use this alias by typing 's whatever' from your command line and 'whatever' starts running in a new window. Good with interactive commands like info, vim, and nethack.

Display the top ten running processes - sorted by memory usage

ps returns all running processes which are then sorted by the 4th field in numerical order and the top 10 are sent to STDOUT.

Print a single route to a destination and its contents exactly as the kernel sees it

Useful to determine the source_ip of outgoing packages to a certain destination

Sets shell timeout

Useful in root's .profile - will auto-logout after TMOUT seconds of inactivity. Close after `seconds` inactive. export TMOUT=seconds (unefunge)

Split a tarball into multiple parts

Create a tar file in multiple parts if it's to large for a single disk, your filesystem, etc. Rejoin later with `cat .tar.*|tar xf -`

Protect directory from an overzealous rm -rf *

-R Recursively change attributes of directories and their contents. +i to set the immutable bit to prevent even root from erasing or changing the contents of a file.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

reverse order of file

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Commands by 0x89 (5)

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