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recurisvely md5 all files in a tree
Found this little gem here: http://info.michael-simons.eu/2008/10/25/recursively-md5sum-all-files-in-a-directory-tree/

What is my ip?

AES file encryption with openssl
To decrypt: openssl aes-256-cbc -d -in secrets.txt.enc -out secrets.txt.new Reference: http://tombuntu.com/index.php/2007/12/12/simple-file-encryption-with-openssl Optional parameter -a makes output base64 encoded, can be viewed in text editor or pasted in email

Switch 2 characters on a command line.
If you typed 'sl', put the cursor on the 'l' and hit ctrl-t to get 'ls'.

locating packages held back, such as with "aptitude hold "
locating packages held back, such as with "aptitude hold "

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

What is my ip?

Create a new file

Is it a terminal?
Oddly, the isatty(3) glibc C call doesn't have a direct analogue as a command 'isatty(1)'. All is not lost as you can use test(1). For example, your script might be run from a tty or from a GUI menu item but it needs to get user-input or give feedback. Now your script can test STDIN with 'isatty 0' or STDOUT with 'isatty 1' and use xmessage(1) if the tty is not available. The other way to test for this is with 'tty -s' - but that's only for STDIN.

github push-ing behind draconian proxies!
If you are behind a restrictive proxy/firewall that blocks port 22 connections but allows SSL on 443 (like most do) then you can still push changes to your github repository. Your .ssh/config file should contain: Host * ForwardX11 no TCPKeepAlive yes ProtocolKeepAlives 30 ProxyCommand /usr/local/bin/proxytunnel -v -p -d %h:443 Host User git Hostname ssh.github.com ChallengeResponseAuthentication yes IdentityFile ~/.ssh/id_rsa IdentitiesOnly yes Basically proxytunnel "tunnels" your ssh connection through port 443. You could also use corkscrew or some other tunneling program that is available in your distro's repository. PS: I generally use "github.com" as the SSH-HOST so that urls of the kind git@github.com:USER/REPO.git work transparently :) You


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