02-11-2010
You have it all in the problem statement: Think well...
Quote:
myenv PRINTER
should print a line such as: PRINTER=kc3500
e.g., myenv HOME PRINTER
should print a line such as: HOME=/home/dwoit
From the examples you must take in account only the 1rst given argument.
But this argument is also a variable, no?
So how will you print out the $1 if you dont store it in a variable ( call it DISPL_ENV) to display?
Why look for complicated syntax for something dead simple if you take the time to read what you are asked.
If you need more just post, but I do hope you find the solution by yourself now
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
what is the actual use of environment variables.
I know only PS1, LOGNAME, PS2 variables
what are the other variables & what is there use (2 Replies)
Discussion started by: indianguru
2 Replies
2. Programming
Hi!
How-to get the environment variables in GNU.
getenv() only fetches the ones that you can find under export (not the ones under declare)...
best regars .David (2 Replies)
Discussion started by: Esaia
2 Replies
3. UNIX for Dummies Questions & Answers
Hi Folks,
Is it possible somehow to unset all the environment variables which have been defined before in UNIX (Solaris).
Thanks,
Slava (3 Replies)
Discussion started by: spavlov
3 Replies
4. UNIX for Dummies Questions & Answers
hi,
1). i would like to know what is meant by environment variables?
2). is the number of envi variables is a constant number for unix systems?
3). how to see the list of envi variables (and the values of the envi variables)in a single command?
4). if this questions were already asked... (3 Replies)
Discussion started by: sekar sundaram
3 Replies
5. UNIX for Dummies Questions & Answers
why are all environment variables represented in a fixed format regardless of the shell you use?
like $HOME $PATH etc (6 Replies)
Discussion started by: sravani
6 Replies
6. Shell Programming and Scripting
Hello!
For the moment some settings in my .bashrc contain the password of my company's firewall, which is not a good idea. I would like to use the string "PASSWORD" set in .bashrc and a script that changes all appearances of "PASSWORD" in the environment variables by the actual password (which... (4 Replies)
Discussion started by: markolopa
4 Replies
7. Shell Programming and Scripting
I have read tons of posts about how you can't set persisting environment variable in a child script of a shell and have it persist. The only way is to source a file as
% . <scriptname>
I am finding that true... but I know there is a way around it. I just don't know how. I worked for 6... (5 Replies)
Discussion started by: rwa25
5 Replies
8. HP-UX
Hi Experts,
Need your help in understanding the commands to setup the environment variables in hp-ux.
Beleive need to use either set,setenv or export.
I am confused between above three options, when to use which option?
On command line, I have tried both set and setenv but couldn't... (1 Reply)
Discussion started by: sai_2507
1 Replies
9. Shell Programming and Scripting
Hi Guys,
I have a a bash script and i am exporting a variable in it.
I am calling a csh script from this bash script.
The variable "ABC" will be visible in csh script.
ks.bash
export ABC = abc
./kp.csh
ab.csh
echo $ABC
setenv ABC =cde (i want to assign this value to ABC only if... (4 Replies)
Discussion started by: vdhingra123
4 Replies
10. Shell Programming and Scripting
I have tried with the following:
csh -c 'source ~/.cshrc; exec bash' # works perfectly
(cat ~/.cshrc; echo exec bash) | csh # not working
And, using sed, I successfully retrieved the environment variables from ~/.cshrc
sed -rn 's/setenv\s+(\S+)\s+(.*)$/export \1=\2/p' ~/.cshrc
but now... (6 Replies)
Discussion started by: royalibrahim
6 Replies
_ENV(3) 1 _ENV(3)
$_ENV - Environment variables
An associative array of variables passed to the current script via the environment method.
These variables are imported into PHP's global namespace from the environment under which the PHP parser is running. Many are provided by
the shell under which PHP is running and different systems are likely running different kinds of shells, a definitive list is impossible.
Please see your shell's documentation for a list of defined environment variables.
Other environment variables include the CGI variables, placed there regardless of whether PHP is running as a server module or CGI proces-
sor.
$HTTP_ENV_VARS contains the same initial information, but is not a superglobal. (Note that $HTTP_ENV_VARS and $_ENV are different variables
and that PHP handles them as such)
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 4.1.0 | |
| | |
| | Introduced $_ENV that deprecated $HTTP_ENV_VARS. |
| | |
+--------+---------------------------------------------------+
Example #1
$_ENV example
<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>
Assuming "bjori" executes this script
The above example will output something similar to:
My username is bjori!
Note
This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script.
There is no need to do global $variable; to access it within functions or methods.
getenv(3), The filter extension.
PHP Documentation Group _ENV(3)