PCP-PYTHON(1) General Commands Manual PCP-PYTHON(1)
pcp-python - run a python script using a preferred python variant
pcp python [SCRIPT [ARG] ...]
pcp-python has been replaced by pmpython(1) which is preferred, however pcp-python is still installed to provided backwards compatibility. pcp-python provides a way to run python scripts using a customisable python binary, rather than embedding any particular version of python into each script. This can be useful as it allows version-independent python code to be run anywhere. All python modules shipped with PCP support versions 2.6 and later (in the python2 series), and 3.3 and later (in the python3 release series). Due to python monitoring and collecting scripts being relatively simple in PCP (not requiring new modules, language features, etc), it has been possible to ensure they work for all of the above python versions. Thus, it is common for PCP python scripts to use a "shebang" line that invokes pcp-python as follows: #!/usr/bin/pcp python This allows the custom setting to be injected instead of a hard-coded python version, while still allowing the user to override the python version as follows: $ PCP_PYTHON_PROG=python3 /usr/bin/pcp python --version Python 3.3.2 $ PCP_PYTHON_PROG=python2 /usr/bin/pcp python --version Python 2.7.5 This is convenient for shipping identical scripts on multiple platforms, and for testing different python versions with the one script (e.g. in the case where multiple versions of python are installed, PCP_PYTHON_PROG can be set in the local environment to override the global setting). By default, the value of PCP_PYTHON_PROG from /etc/pcp.conf will be used. The default value of this configuration parameter is set depending on some heuristics about the target build platform. These heuristics favour the use of python3 in all recent releases of PCP, for those platforms that support it.
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configuration file, as described in pcp.conf(5).
PCPIntro(1) and pcp(1).
This page is part of the PCP (Performance Co-Pilot) project. Information about the project can be found at ⟨http://www.pcp.io/⟩. If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on 2020-08-13. (At that time, the date of the most recent commit that was found in the repository was 2020-08-11.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com Performance Co-Pilot PCP PCP-PYTHON(1)
Pages that refer to this page: pcp(1), pcp-summary(1), pmpython(1)