Building off what Aaron Peart mentioned about verbose mode, sometimes scripts not in verbose mode will initialize but not finish if the default behavior of an included command is to output a line or more to the screen once the proc starts. For example, I wrote a backup script for our intranet which used curl, a utility that downloads or uploads files to remote servers, and is quite handy if you can only access said remote files through HTTP. Using 'curl http://something.com/somefile.xls' was causing a script I wrote to hang and never complete because it spits out a newline followed by a progress line. I had to use the silent flag (-s) to tell it not to output any information, and write in my own code to handle if the file failed to download.
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