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Display a wave pattern
Purely frivolous - print a sine/cosine curve to the console - the width varies as it progresses. Ctrl-C to halt.

Print today's date in ISO format without calling an external command (bash 4)

Output files without comments or empty lines
Filter comments and empty lines in files. I find this very useful when trying to find what values are actually set in a very long example config file. I often set an alias for it, like : alias nocomment='grep -v "^\($\|#\)"'

remove comments from xml
xml with verbose commenting can be difficult to read. remove comments from xml.

Undo commit in Mercurial

Simulate typing
this also generates errors (change 4 to higher number for more mistakes)

Copy an element from the previous command
You can specify a range via '-'.

Recover username and password for Technicolor TC7200 admin page (vulnerability)
The router Technicolor TC7200 has an exploit where the file http://192.168.0.1/goform/system/GatewaySettings.bin is open for unauthenticated access. Even though it is binary, the 2 last strings are the username and password for the pages for router management. It can be read using the 'strings' command, 'hexdump -C' or a hexadecimal editor. (default user/password = admin/admin) Reveals more configuration, including SSID name and Key for the wifi network: $wget -q -O - http://192.168.0.1/goform/system/GatewaySettings.bin Hexadecimal dump of the file: $wget -q -O - http://192.168.0.1/goform/system/GatewaySettings.bin | hexdump -C

Create the directoty recursively

sort a JSON blob
For situations where you keep JSON in a VCS and you want your diffs to be sane, such as within a Chef configuration repo.


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