Information about Env

The ENV (Emission Neutral Vehicle) is an electric motorcycle prototype powered by an hydrogen fuel cell.^[1] It is being developed by Intelligent Energy, a British company.^[2]

Specifications

The vehicle and the fuel cell centre respectivelly weigh approximately 80 and 20 kilograms. It uses a proton-exchange membrane fuel cell to generate about 8 hp or 6 kilowatts. The Discovery Channel has indicated it can reach approximatelly 80 km/h and, on a full tank may ride continuously for about 4 hours and travel a distance of 160 kilometres. The motorcycle is a preproduction prototype conceived by Andy Eggleston which will sell for approximatelly $6000.^[3]

Reference

External links

• Intelligent Energy
• ENV bike
• Business Week article
• Fuel cell motorcycle, The Discovery Chanel, reproduced at youtube.com, Oct 11, 2006

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*For other uses of the three-letter term 'env' see Env (disambiguation)

env is a shell utility for Unix-like operating systems (including Linux). It is used to either print a list of environment variables or run another utility in an altered environment without having to modify the currently existing environment. Using env, variables may be added or removed, and the values of existing variables may be changed.

In practice, env has another common use. It is often used by scripts to launch the correct interpreter. In this usage, the environment is typically not changed.

Examples

To clear the environment for a new shell:

env - /bin/sh

To launch the X Window application xcalc and have it appear on a different display:

env DISPLAY=foo.bar:1.0 xcalc

Here is the code of a very simple Python script:

1. !/usr/bin/env python

print "Hello World."

In this example, /usr/bin/env is the full path of the env command. The environment is not altered.

Note that it is possible to specify the interpreter without using env, by giving the full path of the python interpreter. A problem with that approach is that on different computer systems, the exact path may be different. By instead using env as in the example, the interpreter is searched for and located at the time the script is run. This makes the script more portable, but also increases the risk that the wrong interpreter is selected because it searches for a match in every directory on the executable search path.

External links

• Official GNU env manual
• env(1): run a program in a modified environment – Linux man page on usr-share-man.org

•  • [ e] Unix command line programs and builtins (more)
File and file system management	cat chattr cd chmod chown chgrp cksum cmp cp du df file fsck fuser ln ls lsof mkdir mount mv pwd rm rmdir split touch
Process management	at chroot crontab exit kill killall nice pgrep pidof pkill ps sleep time top wait watch
User Management/Environment	env finger id logname mesg passwd su sudo uname uptime w wall who whoami write
Text processing	awk comm cut ed ex fmt head iconv join less more paste sed sort tac tail tr uniq wc xargs
Shell programming	basename echo expr false printf test true unset
Printing: lp Communications: inetd netstat ping rlogin nc traceroute Searching: find grep strings Miscellaneous: banner bc cal dd man size yes