commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. 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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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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Grabs the complete module list from CPAN, pulls the first column, ditches html lines, counts, ditches small namespaces.
If you want to turn a Git repo into the origin that folks can push to, you should make it a bare repository. See: http://stackoverflow.com/questions/2199897/git-convert-normal-to-bare-repository
If you want to pull all of the files from a tree that has mixed files and directories containing files, this will link them all into a single directory. Beware of filesystem files-per-directory limits.
Get just the IP address for a given hostname. For best results, make this a function in your shell rc file so that it can be used for things like traceroute:
Titus:~$ traceroute `getip foo.com`
traceroute to 22.214.171.124 (126.96.36.199), 64 hops max, 52 byte packets
Create a tar file in multiple parts if it's to large for a single disk, your filesystem, etc.
Rejoin later with `cat .tar.*|tar xf -`
Get your colorized grep output in less(1). This involves two things: forcing grep to output colors even though it's not going to a terminal and telling less to handle those properly.