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fseventer does not support Yosemite until further notice and the suggestions here don't work for me so how can I monitor an installer as it writes files to the file system? I also tried Sloth but it only shows currently open files at a specific point in time.

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This not application specific (it will show all) but you can find the one you are looking for.

iosnoop

This “traces” disk I/O execution live. Each time a disk I/O completes, a line of output is printed to summarize it, including process name and filename details:

Example:

sudo iosnoop

UID   PID D    BLOCK   SIZE       COMM PATHNAME

  503 54079 R 286522800   4096 Google Chrome ??/Cache/data_2
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Derman Enterprises File Control

… makes it easy to determine what's been changed anywhere on your system. …

On OS X 10.11.1, attempts to analyse

/opt

– during an installation by MacPorts – result in a 'No Items Were Processed' dialogue in File Control. So I assume that El Capitan is incompatible with such applications …

… but File Control might work with Yosemite. If not, please vote down this answer.

(I have El Capitan for test purposes, and I can run Mavericks later, but no Yosemite test environment.)

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