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Top Forums Shell Programming and Scripting How to send to perl the content of a bash variable as argument? Post 302961026 by Tribe on Monday 23rd of November 2015 06:46:49 AM
Old 11-23-2015
Quote:
Originally Posted by Aia
I admit I am a little perplexed. Smilie

Why are you trying to call a Python script invoking it with the binary perl?
How do you know that Bash is not expanding and exporting RECEIVEDDATE?
Code:
export RECEIVEDDATE=$(date +"%Y%m%d.%H%M%S")

I'll say it is the only thing working there.
My mistake. It's python, not perl. I wrote incorrectly the thread title.


Quote:
Originally Posted by RudiC
Guessing that RECEIVEDDATE is the variable that you want to be handed over to / processed by the script, I can't see that neither supplied as a parameter to nor referenced within the script.
It doesn't matter because we are passing by value, not by reference, which is what @Aia suggests (reading from environment variable). I don't like that way because reading from environment variable is broken in some verison of python, so I prefer passing by value.

Anyway it's solved, because the problem was in the PTY communication. Changing the terminal solved the issue, so it's working properly as expected (bash replaces $RECEIVEDDATE with its contents before sending it as argument to perl).
 

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PYTHON(1)						    BSD General Commands Manual 						 PYTHON(1)

NAME
python, pythonw -- an interpreted, interactive, object-oriented programming language SYNOPSIS
python ... pythonw ... DESCRIPTION
To support multiple versions, the programs named python and pythonw now just select the real version of Python to run, depending on various settings. (As of Python 2.5, python and pythonw are interchangeable; both execute Python in the context of an application bundle, which means they have access to the Graphical User Interface; thus both can, when properly programmed, display windows, dialogs, etc.) The current supported versions are 2.6 and 2.7, with the default being 2.6. Use % man python2.6 % man python2.7 % man pythonw2.6 % man pythonw2.7 to see the man page for a specific version. Without a version specified, % man pydoc and the like, will show the man page for the (unmodified) default version of Python (2.6). To see the man page for a specific version, use, for example, % man pydoc2.7 CHANGING THE DEFAULT PYTHON
Using % defaults write com.apple.versioner.python Version 2.7 will make version 2.7 the user default when running the both the python and pythonw commands (versioner is the internal name of the version- selection software used). To set a system-wide default, replace 'com.apple.versioner.python' with '/Library/Preferences/com.apple.versioner.python' (admin privileges will be required). The environment variable VERSIONER_PYTHON_VERSION can also be used to set the python and pythonw version: % export VERSIONER_PYTHON_VERSION=2.7 # Bourne-like shells or % setenv VERSIONER_PYTHON_VERSION 2.7 # C-like shells % python ... This environment variable takes precedence over the preference file settings. 64-BIT SUPPORT Versions 2.6 and 2.7 support 64-bit execution (which is on by default). Like the version of Python, the python command can select between 32 and 64-bit execution (when both are available). Use: % defaults write com.apple.versioner.python Prefer-32-Bit -bool yes to make 32-bit execution the user default (using '/Library/Preferences/com.apple.versioner.python' will set the system-wide default). The environment variable VERSIONER_PYTHON_PREFER_32_BIT can also be used (has precedence over the preference file): % export VERSIONER_PYTHON_PREFER_32_BIT=yes # Bourne-like shells or % setenv VERSIONER_PYTHON_PREFER_32_BIT yes # C-like shells Again, the preference setting and environmental variable applies to both python and pythonw. USING A SPECIFIC VERSION
Rather than using the python command, one can use a specific version directly. For example, running python2.7 from the command line will run the 2.7 version of Python, independent of what the default version of Python is. One can use a specific version of Python on the #! line of a script, but that may have portability and future compatibility issues. Note that the preference files and environment variable that apply to the python command, do not apply when running a specific version of Python. In particular, running python2.6 will always default to 64-bit execution (unless one uses the arch(1) command to specifically select a 32-bit architecture). SEE ALSO
python2.6(1), python2.7(1), pythonw2.6(1), pythonw2.7(1), arch(1) BSD
Aug 10, 2008 BSD
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