Commands by rcorrea (1)

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list all file extensions in a directory
A shorter version

zgrep across multiple files

find all active IP addresses in a network

Temporarily ignore known SSH hosts
you may create an alias also, which I did ;-) alias sshu="ssh -o UserKnownHostsFile=/dev/null "

lists files and folders in a folder
lists files and folders in a folder with summary.

Find a file's package or list a package's contents.
This is the fastest method to search the Debian package database. Requires the dlocate package. The dlocate db updates periodically, but you may force an update with # dlocate-update

Expand shortened URLs
curl(1) is more portable than wget(1) across Unices, so here is an alternative doing the same thing with greater portability. This shell function uses curl(1) to show what site a shortened URL is pointing to, even if there are many nested shortened URLs. This is a great way to test whether or not the shortened URL is sending you to a malicious site, or somewhere nasty that you don't want to visit. The sample output is from: $ expandurl http://t.co/LDWqmtDM

Lists all directories under the current dir excluding the .svn directory and its contents

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

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

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