Commands by antonangeli (3)

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View ~/.ssh/known_hosts key information
Will return the SSH server key information for each host you have in your ~/.ssh/known_hosts file, including key size, key fingerprint, key IP address or domain name, and key type.

Count Files in a Directory with Wildcards.
Remove the '-maxdepth 1' option if you want to count in directories as well

Search for a string inside all files in the current directory
options: -n line nbrs, -i ignore case, -s no "doesn't exist", -I ignore binary args: * for all files of current dir (not hidden), .[!.]* for all hidden files I don't include by default the -R (recursive) option, which is not always useful. You add it by hand when needed.

Show account security settings
Show account security settings

List all installed Debian packages
Should work on all systems that use dpkg and APT package management.

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"

Secure copy from one server to another without rsync and preserve users, etc
Source: http://unix.derkeiler.com/Newsgroups/comp.unix.shell/2008-04/msg00068.html

resize(1/2) the image using imagemagick

Generate a sequence of numbers.

Show directories in the PATH, one per line
quoteless


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