Commands by renich

Commands by renich (10)

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SSH connection through host in the middle
This is sample output - yours may be different.
9

ssh -J user@reachable_host user@unreacheable_host

renich · 2019-08-14 17:29:45 148

Find all clients connected to HTTP or HTTPS ports

It finds, specifically, the connections to the HTTP and HTTPS ports as source ports. You can check for destination ports as well. Show Sample Output

ss -o state established '( dport = :http or sport = :https )'

renich · 2019-08-14 17:28:13 487

Find files modified since a specific date

This command uses -newerXY to show you the files that are modified since a specific date. I recommend looking for "-newerXY" on the manpage to get the specifics.
This is sample output - yours may be different.
3

find /path/to/somewhere -newermt "Jan 1"

renich · 2014-02-02 18:02:07 8
clean up memory on linux (fedora)

It clears caches from memory. It works fine on CentOS and Fedora. It will show you how much memory you need, for real.
This is sample output - yours may be different.
-4

sync; echo 3 > /proc/sys/vm/drop_caches

renich · 2011-04-26 21:12:06 10
Convert all your mp3 to ogg

This is not recommended... lossy -> lossy = lossier. Still, you can do it! ;)
This is sample output - yours may be different.
0

find . -iname '*.mp3' | while read song; do mpg321 ${song} -w - | oggenc -q 9 -o ${song%.mp3}.ogg -; done

renich · 2010-03-14 11:34:35 4
Rename .JPG to .jpg recursively

This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension). Show Sample Output
This is sample output - yours may be different.
```
[renich@introdesk ~]$ find ~/ -name '*.JPG' -exec rename .JPG .jpg \{\} \;
[renich@introdesk ~]$ 
```
8

find /path/to/images -name '*.JPG' -exec rename "s/.JPG/.jpg/g" \{\} \;

renich · 2010-01-02 19:12:37 11
View an info page on a nice interface

Nice interface for an info page.
This is sample output - yours may be different.
1

yelp info:foo

renich · 2009-03-29 07:14:48 7
View a man page on a nice interface

A great way of viewing some man page while using gnome.
This is sample output - yours may be different.
3

yelp man:foo

renich · 2009-03-29 07:13:44 8
Generate 10 pronunciable passwords

A great password generation tool. http://www.adel.nursat.kz/apg/ Show Sample Output
This is sample output - yours may be different.
```
[renich@introdesk ~]$  apg -a 0 -n 10
Sodhefreb
SlegTyps
ojBifced
Icsibjafye
Frirphyij
Howviddij|
dramwoolf
youTwik/
dabcybr`
ghistivDej
```
3

apg -a 0 -n 10

renich · 2009-03-28 08:52:59 8

iso-8859-1 to utf-8 safe recursive rename

This command is a powerful "detoxifier" that eliminates special chars, spaces and all those little chars we don't like. It support several "sequences" so be sure to check your /usr/local/etc/detoxrc while at it... and maybe define your own Show Sample Output

detox -r -s utf_8 /path/to/old/win/files/dir

renich · 2009-03-16 07:50:36 18

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check open ports without netstat or lsof

Show all symlinks

find out how many days since given date

You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though.

list files recursively by size

Simple multi-user encrypted chat server for 5 users

Client ~$ ncat --ssl localhost 9876 Change localhost to the correct ip address.

Show all LISTENing and open server connections, with port number and process name/pid

List the Sizes of Folders and Directories

I wanted an easy way to list out the sizes of directories and all of the contents of those directories recursively.

split large video file

i have a large video file, 500+ MB, so i cant upload it to flickr, so to reduce the size i split it into 2 files. the command shows the splitting for the first file, from 0-4 minutes. ss is start time and t is duration (how long you want the output file to be). credit goes to philc: http://ubuntuforums.org/showthread.php?t=480343 NOTE: when i made the second half of the video, i got a *lot* of lines like this: frame= 0 fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbit just be patient, it is working =)

Create a tar archive using xz compression

Compress files or a directory to xz format. XZ has superior and faster compression than bzip2 in most cases. XZ is superior to 7zip format because it can save file permissions and other metadata data.

Update zone file Serial numbers

Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc. Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this. Make sure your server's date is correct, otherwise insert your own serial number. $rndc reload should usually follow this command.

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