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Find the package that installed a command

Quickly CD Out Of Directories
`up 3` will climb the directory tree by three steps. `up asdf` will do nothing, and returns exit code 1 as an error should.

Readd all files is missing from svn repo
When working on a big proeject with SVN, you create quite much files, for now! Can just sit here and type svn add for all of them! svn status will return a list of all of file which get ?(not add), "M"(Modified), "D"(Deleted)! This code just grep "?" flag, then add it into SVN again!

Search apache virtual host by pattern
Outputs contents of virtual hosts containing PATTERN. Particularly useful for pefrorming complex searches. E.g. search for docroot of www.example.com: $ sed -n '/^[^#]*

Rename all (jpg) files written as 3 number in 4 numbers.
Useful if you have a list of images called 1 2 3 4 and so on, you can adapt it to rewrite it as 4 (in this example) 0-padded number.

Password generator
https://xkcd.com/936/ introduced us to what actually is a good password. Here's such an implementation. Credit: quinq on #suckless

Delete recursively only empty folders on present dir

Touch a file using a timestamp embedded in the file name.
tstouch takes two arguments: a filename containing a timestamp, and an extended regular expression with the parenthesized section matching a timestamp of the form YYYYMMDDhhmm or YYYYMMDDhhmm.ss. It then touches the file with that timestamp.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Live filter a log file using grep and show x# of lines above and below


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