Commands by nadavkav (11)

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Get the size of all the directories in current directory (Sorted Human Readable)
as per eightmillion's comment. Simply economical :)

Remove a line in a text file. Useful to fix
In this case it's better do to use the dedicated tool

GREP a PDF file.
This is a good alternative to pdf2text for Ubuntu. To install it: sudo apt-get install python-pdfminer

LDAP search to query an ActiveDirectory server
These are the parameters to ldapsearch (from ldap-utils in Ubuntu), for searching for the record for Joe Blogg's user. sAMAccountName is the LDAP field that ActiveDirectory uses to store the user name. 'DOMAIN\Joe.Bloggs' where "DOMAIN" is the the active directory domain. Othewise you could use "CN=Joe.Bloggs,DC=example,DC=com" instead of "DOMAIN\Joe.Bloggs"

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"

Recursively search and replace old with new string, inside every instance of filename.ext
This is a slightly modified version of http://www.commandlinefu.com/commands/view/4283/recursive-search-and-replace-old-with-new-string-inside-files (which did not work due to incorrect syntax) with the added option to sed inside only files named filename.ext

Poke a Webserver to see what it's powered by.
the good: Server: Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.4 with Suhosin-Patch the bad: Server: Microsoft-IIS/6.0 and the ugly: Server: Apache/2.2.10 (Win32) mod_ssl/2.2.10 OpenSSL/0.9.8i PHP/5.2.6

Show all current listening programs by port and pid with SS instead of netstat

put command in a loop to keep trying a connection
This will keep trying to reconnect your netcat connection can be used with SSH or Telnet, just substitute nc for ssh or telnet very useful for troubleshooting VPNs were you want to send continuous packets towards a destination to trace.

Delete all empty lines from a file with vim


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