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 58
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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Get length of current playlist in xmms2

zgrep across multiple files

Determine whether a CPU has 64 bit capability or not

Check if you have 64bit by looking for "lm" in cpuinfo. lm stands for "long mem". This can also be used without being root.

Generate Sha1, MD5 hash using echo

This is mostly for my own notes but this command will compute a md5 message digest from the command line. You can also replace md5sum with other checksum commands (e.g., sha1sum)

Get a regular updated list of zombies

to omit "grep -v", put some brackets around a single character

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" }

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"

Synchronize date and time with a server over ssh

Set Remote Server Date using Local Server Time (push)

simplest calculator

list block devices

Shows all block devices in a tree with descruptions of what they are.

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Commands by 0x89 (5)

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