[clue] env variables

Mon Jun 24 14:37:49 MDT 2013

When you add
#!/bin/bash
to the top of your script, you are starting a new shell. When the script
completes, it exits that shell. Instead "source" you environmental
variables. Create a file my_env that contains your export commands
# cat my_env
export JAVA_HOME=/usr/java/jdk1.7.0_21
export PATH=$PATH:/usr/java/jdk1.7.0_21/bin

Then source the file
. my_env
(space between . and my_env, does not need to be executable).
Now when you
# echo $JAVA_HOME
usr/java/jdk1.7.0_21
#

Steve

On Mon, Jun 24, 2013 at 1:54 PM, Mark G. Harvey <markgharvey at yahoo.com>wrote:

> CLUE experts,
>
> This puzzle is likely simple for you folks, but it has me stumped.  I've
> done considerable digging but have found mixed advice.
>
> I've created a script to download from a local repo via wget an rpm to
> install JDK ... no problem there.
>
> Here's the part I can't get right ... setting the variables so I can run
> scripts to install Tomcat ... Any attempt will bomb if it can't find
> /usr/java/jdk1.7.0_21/bin
>
>
> # set JAVA_HOME variable   ... tried in vain
> echo "setting JAVA_HOME variable variable for the session"
> JAVA_HOME=/usr/java/jdk1.7.0_21
> # export JAVA_HOME variable  ... tried in vain
> echo "exporting JAVA_HOME variable variable for the session"
> export JAVA_HOME=/usr/java/jdk1.7.0_21
> echo "JAVA_HOME variable: $JAVA_HOME"
>
> # set PATH variable for the session   ... tried in vain
> echo "setting PATH variable for the session"
> PATH=$PATH:/usr/java/jdk1.7.0_21/bin
> # export PATH variable for the session
> echo "exporting PATH variable for the subsequent sessions & processes"
> export PATH=$PATH:/usr/java/jdk1.7.0_21/bin
> echo "show PATH variable: $PATH"
>
> sleep 3  # wait
>
> # create script to set JAVA_HOME & PATH variables in
> /etc/profile.d/00_jdk.sh script for all accounts
> # use echo command with single quotes to write the literal statement to
> the script
> touch /etc/profile.d/00_jdk.sh
> echo '#!/bin/bash' >> /etc/profile.d/00_jdk.sh
> echo '# set JAVA_HOME in /etc/profile.d/00_jdk.sh script for all accounts'
> >> /etc/profile.d/00_jdk.sh
> echo 'JAVA_HOME=/usr/java/jdk1.7.0_21' >> /etc/profile.d/00_jdk.sh
> echo '# set PATH in /etc/profile.d/00_jdk.sh script for all accounts' >>
> /etc/profile.d/00_jdk.sh
> echo 'PATH=$PATH:/usr/java/jdk1.7.0_21/bin' >> /etc/profile.d/00_jdk.sh
>
> sleep 3  # wait
>
> echo "review contents of /etc/profile.d/00_jdk.sh"
> cat /etc/profile.d/00_jdk.sh
>
>
> ... results of install ... added some blank lines for readability ...
>
> [root at 87148-mondev01 ~]# ./DEV_install_jdk1.7-1.0.0.sh
> installation:  Oracle/Sun jdk 1.7 64-bit
> remount /tmp with execute privledge
> changed to /tmp
> Pulling package from Artifactory Repo Management Server
> --2013-06-24 13:24:38--
> https://<RepoHost>/artifactory/simple/ext-release-local/oracle/jdk/7u21-linux/jdk-7u21-linux-x64.rpm<https://%3Crepohost%3E/artifactory/simple/ext-release-local/oracle/jdk/7u21-linux/jdk-7u21-linux-x64.rpm>
> Resolving <RepoHost>... 10.33.44.10
> Connecting to <RepoHost>|10.33.44.10|:443... connected.
>
> HTTP request sent, awaiting response... 200 OK
>
> Length: 85388149 (81M) [application/x-rpm]
> Saving to: “jdk-7u21-linux-x64.rpm”
>
> 100%[=======================================================================================================================================>]
> 85,388,149  52.7M/s   in 1.5s
>
> 2013-06-24 13:24:40 (52.7 MB/s) - “jdk-7u21-linux-x64.rpm” saved
> [85388149/85388149]
>
> jdk downloaded
> check /tmp/ contents for jdk
> -rw-r--r--. 1 root root 85388149 Jun  6 16:46 jdk-7u21-linux-x64.rpm
> install jdk rpm
> Preparing...                ###########################################
> [100%]
> package jdk-2000:1.7.0_21-fcs.x86_64 is already installed      ........
> due to subsequent running of this script
> install jdk complete
>
> setting JAVA_HOME variable variable for the session
> exporting JAVA_HOME variable variable for the session
>
> ... when tested in the script, the correct answer shows up ...
>
> JAVA_HOME variable: /usr/java/jdk1.7.0_21
>
> setting PATH variable for the session
> exporting PATH variable for the subsequent sessions & processes
>
> ... when tested in the script, the correct answer shows up ...
>
>
> show PATH variable:
> /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.7.0_21/bin:/usr/java/jdk1.7.0_21/bin
>
> review contents of /etc/profile.d/00_jdk.sh
> #!/bin/bash
> # set JAVA_HOME in /etc/profile.d/00_jdk.sh script for all accounts
> JAVA_HOME=/usr/java/jdk1.7.0_21
> # set PATH in /etc/profile.d/00_jdk.sh  script for all accounts
> PATH=$PATH:/usr/java/jdk1.7.0_21/bin
> remount /tmp removing execute privledge
> finished
>
>
> ... after script runs, when tested from CLI, variables not not correct ...
>
> [root at 87148-mondev01 ~]# echo $JAVA_HOME
>
> [root at 87148-mondev01 ~]# echo $PATH
> /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
>
>
>
> [root at 87148-mondev01 ~]# exit
> logout
>
> [vwadmin at 87148-mondev01 ~]$ su -
> Password:
>
>
> ... now the variable additions show up ... they come from
> the /etc/profile.d/00_jdk.sh script created as part of the JDK download &
> install ...
>
> [root at 87148-mondev01 ~]# echo $PATH
>
> /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0_21/bin:/root/bin
>
> [root at 87148-mondev01 ~]# echo $JAVA_HOME
> /usr/java/jdk1.7.0_21
>
>
>
> ... How can I get the variables to be available for the current root
> session & usable for subsequent installations?  Trying to avoid the logout
> / login ...
>
>
>
> Thanks for your help.
>
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