08-23-2010
Updating environment variables
ok, this definitely falls in the n00b category... I'm trying to upgrade Java on my server and just need to update the PATH, CLASSPATH, and JAVA_HOME environment variables.
This is what they currently are:
PATH=/usr/local/jdk1.5.0_15//bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/java/bin:/usr/local/ant/bin:/root/bin
JAVA_HOME=/usr/local/jdk1.5.0_15/
CLASSPATH=/usr/local/jdk1.5.0_15//jre/lib
This is my java install directories under /usr/local:
4 drwxr-xr-x 9 root root 4096 Sep 19 2008 jdk1.5.0_15
4 drwxr-xr-x 10 root root 4096 Sep 23 2008 jdk1.6.0_07
0 lrwxrwxrwx 1 root root 11 Sep 23 2008 java -> jdk1.6.0_07
And this is the java that is being used:
[root@dev local]# which java
/usr/local/jdk1.5.0_15/bin/java
I looked at my /etc/bashrc and it is calling /etc/profile.d/java.sh, which looks like this:
export JAVA_HOME=/usr/local/java
export ANT_HOME=/usr/local/ant
export PATH=$PATH:$JAVA_HOME/bin:$ANT_HOME/bin
What's confusing me is that I can see that the java.sh is indeed running but things aren't working out properly.
1) I can see the java.sh appends the last 2 entries of the PATH shown above. But the first entry in the path goes to the jdk1.5 with a double //bin.
2) JAVA_HOME does not point to /usr/local/java but to /usr/local/jdk1.5.0_15/
Any ideas how to figure this out?
Thanks!
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LEARN ABOUT MOJAVE
env5.18
Env(3pm) Perl Programmers Reference Guide Env(3pm)
NAME
Env - perl module that imports environment variables as scalars or arrays
SYNOPSIS
use Env;
use Env qw(PATH HOME TERM);
use Env qw($SHELL @LD_LIBRARY_PATH);
DESCRIPTION
Perl maintains environment variables in a special hash named %ENV. For when this access method is inconvenient, the Perl module "Env"
allows environment variables to be treated as scalar or array variables.
The "Env::import()" function ties environment variables with suitable names to global Perl variables with the same names. By default it
ties all existing environment variables ("keys %ENV") to scalars. If the "import" function receives arguments, it takes them to be a list
of variables to tie; it's okay if they don't yet exist. The scalar type prefix '$' is inferred for any element of this list not prefixed by
'$' or '@'. Arrays are implemented in terms of "split" and "join", using $Config::Config{path_sep} as the delimiter.
After an environment variable is tied, merely use it like a normal variable. You may access its value
@path = split(/:/, $PATH);
print join("
", @LD_LIBRARY_PATH), "
";
or modify it
$PATH .= ":.";
push @LD_LIBRARY_PATH, $dir;
however you'd like. Bear in mind, however, that each access to a tied array variable requires splitting the environment variable's string
anew.
The code:
use Env qw(@PATH);
push @PATH, '.';
is equivalent to:
use Env qw(PATH);
$PATH .= ":.";
except that if $ENV{PATH} started out empty, the second approach leaves it with the (odd) value "":."", but the first approach leaves it
with ""."".
To remove a tied environment variable from the environment, assign it the undefined value
undef $PATH;
undef @LD_LIBRARY_PATH;
LIMITATIONS
On VMS systems, arrays tied to environment variables are read-only. Attempting to change anything will cause a warning.
AUTHOR
Chip Salzenberg <chip@fin.uucp> and Gregor N. Purdy <gregor@focusresearch.com>
perl v5.18.2 2013-11-04 Env(3pm)