Scripts

From UA Libraries Digital Services Planning and Documentation

Revision as of 21:49, 10 November 2010

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Counting stuff

On Making Scripts Work on Mac OSX:

Associating Scripts

• To associate files with particular software , CTRL-click on the file.
  • Choose "open with". If that isn’t available, choose "open".
  • In the Enable box, set the value to "All Applications".
  • Check the "Always Open With" box.
  • Select Utilities>Terminal
  • Then click "Open" and you should be good to go.

Running Scripts

• Since the MACs come with many scripting languages pre-installed the scripts are essentially run by double clicking on the file name, although manually launching them from the terminal should work as well.
  • For example:

  $ python foo.py
  $ ./foo.py

• In the second case the script AND in the case of double-clicking the filename, the script would have to include the appropriate shebang line, for example #!/usr/bin/python for Python scripts and #!/usr/bin/perl for Perl scripts.
  • This will allow the MACs to know where to locate Python and Perl, respectively.
  • If for some reason this doesn't work, make sure the script is saved with a UNIX style byte order so that the shebang will be read properly by the MAC.
  • A good text editor like Notepad ++ (Windows) easily allows one to make these changes to text files.

Programming Notes

• Save scripts with a UNIX style byte order. Not doing so appears to prevent the OS from being able to read the shebang line.
• If you are adding timestamps to log files, etc. strip all whitespaces and colons from your timestamp variable for any timestamps . Not doing so can prevent the file from getting written.
  • For example if your timestamp variable is $timestamp try this:

 #start MAC block
 #trimming whitespace and colons because the MAC won't write the output file if they are present
 $timestamp=~ s/\s//g;
 $timestamp=~ s/://g;
 #end MAC block

• Make sure you use only forward slashes for path slashes. e.x. "foo.bar" is good, but "foo\bar" is bad.
  • There should be no need to ever use backslashes in scripts, however, as Windows OS is equally tolerant of forward and backslashes.