A headcrab is a fictional alien parasitoid found in the Half-Life video game series created by Valve Software. They are the most common and arguably the most iconic aliens in the series. == Attributes == === Depiction === Headcrabs are depicted as parasitic lifeforms roughly 2 feet (0.61 m) long. The common headcrab variant has rounded bodies with four legs for movement, two of which are long clawed legs at the front and two stubby legs at the back. Their pair of large frontal claws are for attacking, and as additional support when standing still. Under the headcrab's body is a large ro...

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. First released in 1989, it has been distributed widely as the default login shell for most Linux distributions and Apple's macOS (formerly OS X). A version is also available for Windows 10. Bash is a command processor that typically runs in a text window, where the user types commands that cause actions. Bash can also read and execute commands from a file, called a script. Like all Unix shells, it supports filename globbing (wildcard matching), piping, here documents...