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,…):
Subscribe to the feed for:
# find assumes email files start with a number 1-9
# sed joins the lines starting with " " to the previous line
# gawk print the received and from lines
# sort according to the second field (received+from)
# uniq print the duplicated filename
# a message is viewed as duplicate if it is received at the same time as another message, and from the same person.
The command was intended to be run under cron. If run in a terminal, mutt can be used:
mutt -e "push otD~=xq" -f $folder
will find where myscript is, and then use vi to edit that file. Not much trick, but saves typing if you use it a lot.
The $(!!) will expand to the previous command output (by re-running the command), which becomes the parameter of the new command newcommand.