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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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
Does an in situ search-replace but leaves a datestamped backup. A variation with more precision:
sed -i.`date +%Y%m%d%H%M%S 's/pattern/replace' [filename]
customizable context searches - if you know sed, this is a basis for more complex context control than grep --context offers
...can do similar w/ tar, dd, xfsdump, e2fsdump, etc.
fuser 25/tcp (see which pid is listening on smtp)
a pkcs8 key will have integer 00 at offset 4 and an rsaEncryption object at offset 9
changes group ownership of all files/dirs in /path/to/dir to a project group [projgroup] and then gives the sgid bit to directories in that tree - all subsequently created files will inherit [projgroup]'s gid.
useful if you want to start running a svc as a non-privileged user instead of root.