set is used to display the contents of your environment. Issue it and you will get a list of variable=value lines. There are several special variables among these, but it will show you all variables defined in this shell so far.
export is used on variables to have them inherited by processes spawned from this environment.
To explain this in a little more detail: you can start any program from within the shell - even another invokation of this shell. When you declare a variable within a certain shell environment then the program(s) started from this environment does not know about this variable automatically. If the variable is "export"ed it will be known, though.
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)
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)
hi,
I want to create a new EV(Environment Variable) through a c program and I done this thing through setenv() method. But the newly created EV is not permanent, i.e. when I exit from the program the EV also no longer lives. But I want to make it a permanent EV for the current user. Actually I... (6 Replies)
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)
1. The problem statement:
What is the mesg value set for your environment? If it is on, how would you turn off your current
session? How would you set it permanently?
3. The attempts at a solution :
Read Unix The textbook.
3rd chapter has many things like environment variables and... (5 Replies)
Hi All,
I need to understand following three environment variables and their usages in HP Unix.
_M_ARENA_OPTS
_M_CACHE_OPTS
PTHREAD_SCOPE_SYSTEM
How does these environment variables influence multi threaded applciation and how do we decide the value of these variables? Is there... (0 Replies)
Discussion started by: angshuman
0 Replies
LEARN ABOUT SUNOS
printenv
printenv(1B) SunOS/BSD Compatibility Package Commands printenv(1B)NAME
printenv - display environment variables currently set
SYNOPSIS
/usr/ucb/printenv [variable]
DESCRIPTION
printenv prints out the values of the variables in the environment. If a variable is specified, only its value is printed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), echo(1), sh(1), stty(1), tset(1B), attributes(5), environ(5)DIAGNOSTICS
If a variable is specified and it is not defined in the environment, printenv returns an exit status of 1.
SunOS 5.10 14 Sep 1992 printenv(1B)