This is useful when watching a log file that does not contain timestamps itself.

If the file already has content when starting the command, the first lines will have the "wrong" timestamp when the command was started and not when the lines were originally written.

So your boss wants to know how much memory has been assigned to each virtual machine running on your server... here's how to nab that information from the command line while logged in to that server

urls.txt should have a fully qualified url on each line

prefix with

to clear the log

change curl command to

to just get the http status

Notes:

1) -n-1 means sort key is the last field

2) -l is important if each separate record is on a new line (usually so for text files)

3) -j tells msort not to create log file (msort.log) in the working directory

4) may need to install msort package.

5) msort does lot more. Check man msort

usage examples

ls largedir |rd

lynx -dump largewebsite.com |rd

rd < largelogfile

splits a postscript file into multiple postscript files. for each page of the input file one output file will be generated. The files will be numbered for example 1_orig.ps 2_orig.ps ...

The psselect commad is part of the psutils package

Convert all jpegs in the current directory into ~1024*768 pixels and ~ 150 KBytes jpegs

Renames files in a directory to incremental numbers, following alphabetic order. The command does not maintain extensions.

This heavy one liner gets all the files in the "/music/dir/" directory and filters for non 44.1 mp3 files. After doing this it passes the names to sox in-order to re-sample those files. The original files are left just in case.

This command will download $file via server. I've used this when FTP was broken at the office and I needed to download some software packages.

This takes quite a while on my system. You may want to test it out with /bin first, or background it and keep working.

If you want to get rid of the "No manual entry for [whatever]" and just have the [whatever], use the following sed command after this one finishes.

A shortcut to generate documentation with phpdoc. Defaults to HTML; optionally to PDF if third argument is given. Stores documentation in cwd under ./docs/. I forget the syntax to the output, -o, option, so this is easier.

count the times a domain appears on a file which lines are URLs in the form http://domain/resource.

-r to use extended regex

^ begin line

| alternative

get 100 or 0-9 one or two times

This will search all directories and ignore the CVS ones. Then it will search all files in the resulting directories and act on them.

Grab a list of MP3s (with full path) out of Firefox's cache

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the *full path* of those tunes straight out of FF's cache in a clean list.

Shorter and Intuitive version of the command submitted by (TuxOtaku)

Ever gone to a site that has an MP3 embedded into a pesky flash player, but no download link? Well, this one-liner will yank the names of those tunes straight out of FF's cache in a nice, easy to read list. What you do with them after that is *ahem* no concern of mine. ;)

Finds all (not just adjacent) repeated lines in a file.

make sure that flac and lame are installed

sudo apt-get install lame flac