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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Print the IP address and the Mac address in the same line
Print the IP address and the Mac address in the same line

Send an http HEAD request w/curl

analyze traffic remotely over ssh w/ wireshark
When using tcpdump, specify -U option to prevent buffering.

Install pip with Proxy
Installs pip packages defining a proxy

validate the syntax of a perl-compatible regular expression
Place the regular expression you want to validate between the forward slashes in the eval block.

tar.gz with gpg-encryption on the fly
Create a encrypted tar.gz file from a directory on the fly. The encryption is done by GPG with a public key. The resulting filename is tagged with the date of creation. Very usefull for encrypted snapshots of folders.

Create a tar of directory structure only
The original suggestion did not work for me, when operating on folders located on an external mount (ie other than the root device) in Ubuntu. A variation using xargs does the trick.

Install pip with Proxy
Installs pip packages defining a proxy

Find the package that installed a command

list all file-types (case-insensitive extensions) including subdirectories


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