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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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"

Find jpeg images and copy them to a central location

Use if you have pictures all over the place and you want to copy them to a central location Synopsis: Find jpg files translate all file names to lowercase backup existing, don't overwrite, preserve mode ownership and timestamps copy to a central location

List Listen Port by numbers

Show TCP Listen ports sorted by number (bugs: IPV6 addresses not supported)

histogram of file size

Find all files larger than 500M and less than 1GB

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" }

Count number of files in a directory

Signals list by NUMBER and NAME

This command seems to achieve the similar/same goal.

Edit the /etc/sudoers config file the right way.

'visudo' is installed by default on most Unix-like systems. If not installed, you can get it from the 'sudo' package. 'visudo' will use the text editor found in your $EDITOR variable, whether it's vi, vim, emacs, nano or gedit. After making changes to the /etc/sudoers file, visudo will check for syntax errors, and notify you of them. This is better than 'vi /etc/sudoers', because of this capability. Rule #1 of system administration- if there is a tool that exists for editing config files, use the tool.

Short Information about loaded kernel modules

Run this as root, it will be helpful to quickly get information about the loaded kernel modules.

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