changes THIS to THAT in all files matching fileglob* without using secondary files

Alternatively, if your password can contain a richer character set, try using 'uuencode' rather than base64.

Sample of that: '0:.CF\-@"\`W315VG^4O\.@``'

For some of my web servers I setup and configure, for scaling I use the httpd.conf settings for these. Sometimes I forget which servers are prefork and which are worker MPM, so I use this to remind myself.

mount with:

mount -t msdos -o loop ./floppy.img /tmp/mnt

...if you get a certificate back, the server is accepting weak SSL ciphers

Bork, bork, bork!

To keep it short, the first terminal line doesn't show a prompt.

You need the RANDR support enable, to enable it with an ATI card run:

To show your available output run:

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]

This command repeatedly gets the specified process' stack using pstack (which is an insanely clever and tiny wrapper for gdb) and displays it fullscreen. Since it updates every second, you rapidly get an idea of where your program is stuck or spending time.

The 'tac' is used to make the output grow down, which makes it less jumpy. If the output is too big for your screen, you can always leave the 'tac' off to see the inner calls. (Or, better yet--get a bigger screen.)

Caveats: Won't work with stripped binaries and probably not well with threads, but you don't want to strip your binaries or use threads anyway.

Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)

customizable context searches - if you know sed, this is a basis for more complex context control than grep --context offers

Shows a tree view of parent to child processes in the output of ps (linux). Similar output can be achieved with pstree (also linux) or ptree (Solaris).

Grabs all rar files in any current subdirectories and feeds it to unrar. Doesn't work well with things packaged like file.part01.rar. Works best with File.rar. You can recurse into other directories by adding more /*'s

Limits the number of rows per table to X

Sometimes apache will get stuck in an established state where you can't get a list of the connecting IP's from mod_status... not a good thing when you need to ban an abusive ip.

At some point you want to know what packets are flowing on your network. Use tcpdump for this. The man page is obtuse, to say the least, so here are some simple commands to get you started.

-n means show IP numbers and don't try to translate them to names.

-l means write a line as soon as it is ready.

-i eth0 means trace the packets flowing through the first ethernet interface.

src or dst w.x.y.z traces only packets going to or from IP address w.x.y.z.

port 80 traces only packets for HTTP.

proto udp traces only packets for UDP protocol.

Once you are happy with each option combine them with 'and' 'or' 'not' to get the effects you want.

This command creates a file of arbitrary size in a windows environment.