Commands by octopus

Commands by octopus (9)

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Find MAC address of Active Eth connection
This is sample output - yours may be different.
-2

/sbin/ifconfig|grep -B 1 inet |head -1 | awk '{print $5}'

octopus · 2010-04-22 06:35:29 4
List all packages by installed size (Bytes) on rpm distros
This is sample output - yours may be different.
3

rpm -q -a --qf '%10{SIZE}\t%{NAME}\n' | sort -k1,1n

octopus · 2010-04-19 07:44:49 1
Extract title from HTML files

This command can be used to extract the title defined in HTML pages
This is sample output - yours may be different.
3

sed -n 's/.*<title>$.*$<\/title>.*/\1/ip;T;q' file.html

octopus · 2010-04-19 07:41:10 1
Legacy MacOS to Unix text convert using perl
This is sample output - yours may be different.
0

perl -i -pe 's/\r/\n/g' file

octopus · 2010-04-16 13:25:09 1
Combining text files into one file
This is sample output - yours may be different.
-16

ls | grep *.txt | while read file; do cat $file >> ./output.txt; done;

octopus · 2010-04-16 13:19:38 1
Run command from another user and return to current
This is sample output - yours may be different.
1

su - $user -c <command>

octopus · 2010-04-16 13:17:02 0
List all installed PERL modules by CPAN

This command will give you the detailed information about the installed perl modules i.e. installed path, Link type, version, files etc. Show Sample Output
This is sample output - yours may be different.
```
       Thu Jun 25 10:48:08 2009: "Module" IO::Dir::Recursive

       ?   "installed into: /usr/lib/perl5/site_perl/5.8.8"

       ?   "LINKTYPE: dynamic"

       ?   "VERSION: 0.03"

       ?   "EXE_FILES: "
```
3

perldoc perllocal

octopus · 2010-04-14 10:57:56 1
a2p converts awk scripts to perl programs
This is sample output - yours may be different.
0

a2p -F:

octopus · 2010-04-12 08:49:44 0
How to check network connection from one interface

This command only check the network connection from given eth. This is very useful if you are using more then one interface in your server or laptop. Show Sample Output
This is sample output - yours may be different.
```
PING any-fp.wa1.b.yahoo.com (69.147.125.65) from <IP> eth0: 56(84) bytes of data.
```
1

ping -I eth0 www.yahoo.com

octopus · 2010-04-12 06:25:07 0

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Trim png files in a folder

That should be a short as it can get.

combining streams

2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Count items in JSON array

Pipe any JSON to jq, then count with the appropiate expression and use the | length on the array

get function's source

no need to reinvent the wheel. Thanks to the OP for the "obsolete" hint. 'declare' may come in pretty handy on systems paranoid about "up-to-dateness"

list block devices

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

Selecting a random file/folder of a folder

Also looks in subfolders

Display / view the contents of the manifest within a Java jar file

Displays the manifest within a jar file. Can use it to confirm version number, etc.

check open ports without netstat or lsof

tar directory and compress it with showing progress and Disk IO limits

tar directory and compress it with showing progress and Disk IO limits. Pipe Viewer can be used to view the progress of the task, Besides, he can limit the disk IO, especially useful for running Servers.

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