10-28-2008
system.getenv() retruns the value of an environment variable. I don't think properties files are guaranteed convey the value of variables like that.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
I have say two programs
File1:
echo Enter A's Value
read A
export A
File2:
while
do
echo $A
sleep 5
done (1 Reply)
Discussion started by: pbsrinivas
1 Replies
2. IP Networking
could anyone Explain me with how the linux o/s keeps track of file
updates in network environment? for example, assume that more than one
computer is connected to network (with linux in all of them). if an
user say 'X' logged into terminal 1 and created a file with the name
of 'temp.txt'. The... (1 Reply)
Discussion started by: pjchoudary
1 Replies
3. Filesystems, Disks and Memory
could anyone Explain me with how the linux o/s keeps track of file
updates in network environment? for example, assume that more than one
computer is connected to network (with linux in all of them). if an
user say 'X' logged into terminal 1 and created a file with the name
of 'temp.txt'. The... (1 Reply)
Discussion started by: pjchoudary
1 Replies
4. Shell Programming and Scripting
I've searched Google and now this forum. Best guess is my search fu is not good (and it probably isn't). The Google search did bring me here.
Background
I have a number of Korn Shell scripts who all use one of 3 values for an environment variable used in the backup system.
On occasion one or... (8 Replies)
Discussion started by: WolfBrother
8 Replies
5. Shell Programming and Scripting
Hi,
i have the following env variable. currently i am exporting variable in the same script file. but i need this is in a text file and the scripts need to export this variable from the text file.
can you please suggest me. is it possible.
export... (6 Replies)
Discussion started by: rsivasan
6 Replies
6. Shell Programming and Scripting
I'm trying to make a sed substitution where the substitution pattern is an environment variable to be expanded, but the variable contains a "slash".
sed -e 's/<HOME_DIRECTORY>/'$HOME'/'This gives me the following error:
sed: -e expression #1, char 21: unknown option to `s'Obviously this is... (2 Replies)
Discussion started by: Ilja
2 Replies
7. UNIX for Dummies Questions & Answers
I want to set a enviroment variable
VDC_DIR to a particular directory.
I am doing it as
export VDC_DIR=/abc
it gets set but when i logout and do relogin than its not there.
one way could be setting it in .profile file.
but i have seen it on another box where it is not present in... (2 Replies)
Discussion started by: Jcpratap
2 Replies
8. Shell Programming and Scripting
Hi,
I an having some environment variables exported and the variable name is present in the file. But its not resolving with following commands. Can someone throw some light.
db $ grep -v "^#" TD_FWK_NUCLEUS.dbc | grep -v "^$" | xargs -i echo {}
wb_bin: ${TD_FWK_NUCLEUS_DBC_WB_BIN_TAG}
I... (3 Replies)
Discussion started by: Mohammed Rafi
3 Replies
9. Shell Programming and Scripting
Hi,
I meet an problem that it cannot change Terminal environment variable in a perl or bash script.
This change can only exist and become effective in script lifetime.
But I want to make this change take effect in current opened Terminal.
In our view, the thought seems to be impossible,
As... (9 Replies)
Discussion started by: weichanghe2000
9 Replies
10. UNIX for Dummies Questions & Answers
I know that I can do this in bash
ver=${VERSION:-$DEFVERSION}
so ver is $VERSION if it's set but $DEFVERSION if $VERSION isn't set
I want to do the same thing as a macro in a Makefile and can't get it to work - maybe something like...
VER=$(shell ${$(VERSION):-$(DEFVERSION)})
Any help... (1 Reply)
Discussion started by: JerryHone
1 Replies
LEARN ABOUT ULTRIX
unsetenv
getenv(3) Library Functions Manual getenv(3)
Name
getenv, setenv, unsetenv - manipulate environment variables
Syntax
char *getenv(name)
char *name;
setenv(name, value, overwrite)
char *name, value;
int overwrite;
void unsetenv(name)
char *name;
Description
The subroutine searches the environment list for a string of the form name = value and returns a pointer to the string value if such a
string is present, otherwise returns the value 0 (NULL). For further information, see
The subroutine searches the environment list in the same manner as If the string name is not found, a string of the form name=value is
added to the environment. If it is found, and overwrite is non-zero, its value is changed to value. The subroutine returns 0 on success
and -1 on failure, where failure is caused by an inability to allocate space for the environment.
The subroutine removes all occurrences of the string name from the environment. There is no library provision for completely removing the
current environment. It is suggested that the following code be used to do so.
static char *envinit[1];
extern char **environ;
environ = envinit;
All of these routines permit, but do not require, a trailing equals sign (=) on name or a leading equals sign on value.
See Also
csh(1), sh(1), execve(2), putenv(3), environ(7)
getenv(3)