[clue] env variables

Mon Jun 24 14:43:24 MDT 2013

Dennis, 

Yes, it starts with #!/bin/bash

I didn't know it was possible to run a Bash script with out it ... interesting ... as the shell is Bash, I'll guess it could be done.  

>________________________________
> From: "dennisjperkins at comcast.net" <dennisjperkins at comcast.net>
>To: Mark G. Harvey <markgharvey at yahoo.com>; CLUE's mailing list <clue at cluedenver.org> 
>Sent: Monday, June 24, 2013 2:21 PM
>Subject: Re: [clue] env variables
> 
>
>
>I'm guessing your script began with #!/bin/bash.  That spawns a new process with its own environment inherited from th parent.  JAVA_HOME and PATH were set and exported in your script, so those values are set in your script's environment (and for any programs that it called).  It does not set values in the parent environment.  Try running it without #!/bin/bash.  I think that will run the script in the same environment.  Note that this means that your script can only be called from bash.
>
>... great idea !  Yes, I do want to set JAVA_HOME & PATH in the current root shell 
>
>
>I'll give it a go.  Just might be that simple a fix. 
>
>I have a few comments on the scripts.
>
>1. Why the sleep statements?  They don't appear to do anything useful.   ... The sleep statements are there so I can read what is happening on the screen as the script is processed.  
>
>2. You don't need to use touch to create the file.   .... Ok, just a different method that I'm used to.  
>
>3. You probably want to use > to write the first line to /etc/profile.d/00_jdk.sh.  If the file already exists, you're appending your string.  Using > will erase the file if it exists and write the string to an empty file.   Good idea ... I'll drop touch & use a single > to create a fresh file in /etc/profile.d/ 
>
> 4. You could use a HERE doc statement for all of the echoes you used to create 00_jdk.sh.  ... I was attempting to avoid having to upload a small file when I could just use simple commands to create it.  I'll have to check out the "heredoc" command.  
>
>
>... Thanks for the feedback !!
>
>
>
>
>
>>________________________________
>From: "Mark G. Harvey" <markgharvey at yahoo.com>
>To: "CLUEmessage CLUE" <clue at cluedenver.org>
>Sent: Monday, June 24, 2013 1:54:14 PM
>Subject: [clue] env variables
>
>
>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
>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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