I have a little script to read my PATH and store in a file, which I would like to be scheduled to run daily.
path = os.getenv("PATH")
file_name = "C:\\temp.txt"
file = io.open(file_name, "w")
file:write(path)
file:close()
If I run it from command line it works, but when I create batch file (I work on Windows XP) and double click it - the os.getenv("PATH") returns false. The batch file:
"C:\Program Files\Lua\5.1\lua" store_path.lua
I read in comments to this question that it "is not a process environment variable, it's provided by the shell, so it won't work". And indeed, some other env variables (like username) work fine.
The two questions I have are:
Why the shell does not have access to the PATH? I thought it would
make a copy of the environment (so only setting env variable would be a problem)?
What would be the best way to read the PATH in such a way that I can add
it to a scheduler?
Have the batch file run it from a shell so that you get shell variables:
cmd /c C:\path\to\lua myfile.lua
Related
I have an environment file named .env337_dev. I need to run this file to set the environment before running another command. How to run this file?
Inside the file, it contains several variables like this
export AB_HOME=/et/dev/abinitio/sit1/abinitio-V2 #/gcc3p32 # for 32-bit
export PATH=${AB_HOME}/bin:${PATH}
Apart from . ./.env337_devcommand which will run and set the environment, is there any other way to run this file ?
Are you looking for the user-specific .bashrc (bash is the default shell on RHEL 6) or a system-wide /etc/profile.d/<something>.sh? For the first, you would edit $HOME/.bashrc and append a line like . .env337_dev (it's still run before any "regular" command, because .bashrc is the Bash standard personal initialization file). Second option suggests that you use an absolute path.
If this doesn't answer your question, a more specific question and/or more details would be very helpful.
You tagged this ab-initio, so you should only be setting a very few environment variables, including:
export AB_HOME=<path-to-co>operating-system>
export PATH=$AB_HOME/bin:$PATH
If you are working with Ab Initio web applications:
export AB_APPLICATION_HUB=<path-to-application-hub>
export JAVA_HOME=<path-to-jdk>
export PATH=$JAVA_HOME/bin:$PATH
and specific settings for different applications, e.g.
export AB_MHUB_HOME=<path-to-metadata-hub-installation>
Typically you put those into the file .profile in your home directory, which shells evaluate for interactive sessions.
I am not able to set env variables through an executable csh/tcsh script
An env variable set inside a csh/tcsh executable script "myscript"
contents of the script ...
setenv MYVAR /abc/xyz
which is not able to set on the shell and reports "Undefined variable"
I have made the csh/tcsh script as executable by the following shell command
chmod +x /home/xx/bin/myscript
also the path is updated to
set path = (/home/xx/bin $path)
which myscript
/home/xx/bin/myscript
When I run the script on command line and echo the env variable ..
myscript
echo $MYVAR
MYVAR "Undefined variable"
but if i source on command line
source /home/xx/bin/myscript
echo $MYVAR
/abc/xyz
you need to source your code rather than execute it so that it is evaluated by the current shell where you want to modify the environment.
You can of course embed
source /home/xx/bin/myscript
within your .cshrc
the script does not need to be executable or have any #! shebang (though they don't hurt)
This is not how environment variables work.
An environment variable is set for a process (in this case, tcsh) which is passed on to all child processes. So when you do:
$ setenv LS_COLORS=foo
$ ls
You first set LS_COLORS for the tcsh process, tcsh then starts the child process ls which inheres tcsh's environment (including LS_COLORS), which it can then use.
However, what you're doing is setting the environment is a child process, and then want to propagate this back to the parent process (somehow). This is not possible. This has nothing to do with tcsh, it works like this for any process on the system.
It works with source because source reads a file, and executes it line-by-line in the current process. So it doesn't start a new tcsh process.
I will leave it as an exercise to you what the implications would mean if it would be possible :-) Do you really want to deal with unwise shell scripts that set some random environment variables? And what about environment variables set by a php process, do we want those to go back in the parent httpd process? :-)
You didn't really describe what goal you're trying to achieve, but in general, you want to do something like:
#!/bin/csh -f
# ... Do stuff ...
echo "Please copy this line to your environment:"
echo "setenv MYVAR $myvar"
I have set up a cron job to run once an hour a script cron/cron.php
This script simply reads a table to check which scripts should run at a given time.
So far no problem.
I just noticed that $_SERVER['DOCUMENT_ROOT'] and $_SERVER['SERVER_NAME'] is empty. Same to $_ENV['HOSTNAME']
What can be the reason? I would prefer to have my cron.php portable so I am searching for a solution which should work on every server.
Thanks in advance for any tips!
When the cron script is run, it's most likely executed by the php-cli binary and not the webserver.
$_SERVER entries are set by the webserver, here is the quote from $_SERVER page in the PHP manual:
$_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server.
As there is no webserver involved with your cron script, these are not set. You can try this your own by executing php on the command-line:
php -r 'var_dump($_SERVER);'
it will output all settings in $_SERVER in your command-line environment, "DOCUMENT_ROOT" most likely will be an empty string and "SERVER_NAME" is not set at all.
The $_ENV superglobal contains the environment variables of the system specifically, it's just that "HOSTNAME" is not set as environment variable by the cron binary.
Further Considerations
I normally suggest to not only create the PHP cron script (as you did with cron/cron.php) but also to create a shell-script that invokes the php script. Then use the shell-script in the crontab. This allows you to modify the environment easily without re-configuring the crontab or the cron.php too often. You can then set environment variables within that shell script as well as changing the working directory etc.
If you want to make your cron.php script more portable, figure out what the injected environment dependencies are (e.g. the document root your have) and make those variable, e.g. with variables or a parameter object. Then create a section in your script where those variables are populated and the rest of your script can run based on them in an injected manner. This reduces configuration changes only to a very limited part of your script and will allow you to create more re-useable code.
I have Installshiled script which define CATALINA_HOME as environment Variable initially. same script after that execute the batch file service.bat that is using CATALINA_HOME. this file when executed display the error CATALINA_HOME is not define define correctly. as this variable is defined as environmental VARIABLE and pointing Tomcat Directory Properly. I thing the system require reboot to recognize environment Variables.Is there any way to define Environment that work directly without reboot. I am using 64 bit Windows 7.
I may be wrong but the script that you're running loads the env variables once when you start it so you won't get any new env variables added during the runtime of the script.
And in your script, if you just execute the batch file, it will use the same out dated env variables the script started with.
What I do is run 'cmd /k service.bat' This starts a new shell (with the updated env variables) and runs the batch file and terminates afterwards.
You shouldn't need to reboot between your install.
I have a shell script I wish to read parameters from an external file, to get files via FTP:
parameters.txt:
FTP_SERVER=ftpserer.foo.org
FTP_USER_NAME=user
FTP_USER_PASSWORD=pass
FTP_SOURCE_DIRECTORY="/data/secondary/"
FTP_FILE_NAME="core.lst"
I cannot find how to read these variables into my FTP_GET.sh script, I have tried using read but it just echoed the vars and doesn't store them as required.
Assuming that 'K Shell' is Korn Shell, and that you are willing to trust the contents of the file, then you can use the dot command '.':
. parameters.txt
This will read and interpret the file in the current shell. The feature has been in Bourne shell since it was first released, and is in the Korn Shell and Bash too. The C Shell equivalent is source, which Bash also treats as a synonym for dot.
If you don't trust the file then you can read the values with read, validate the values, and then use eval to set the variables:
while read line
do
# Check - which is HARD!
eval $line
done