My goal is to write an as simple as possible (but not more simple) that generates a list of currently installed PHP extensions (*.so files) that the user can simply copy/paste into their php.ini. It should be compatible at minimum with OS X and at least some major Linux distros (Ubuntu, Arch Linux, RHEL, etc.).

The expected output would look like:


So far, I have come up with this:

find `php-config --extension-dir` -name "*.so" | rev | cut -d / -f 1 | rev

It works well, but I feel it's a bit clumsy with all the string reversions. And, it only generates the extensions' names, it does not add the extension= prefix.

I needed to use the reversions because the extension-dir might be of any depth, thus I cannot simply cut the string at a pre-determined path separator position. However, I know that if I cut it from the end at the first separator, I will get only the filename.

Then I discovered the replace utility and wrote this, which is a perfect fit for my task, except it does not seem to be available on OS X and Arch Linux, the two systems I use most:

find `php-config --extension-dir` -name "*.so" | replace `php-config --extension-dir`/ 'extension='

Basically, I am looking for other creative (but simple) ways of completing this task. What other utilities could I use? Educate me! :)


How about this?

find "`php-config --extension-dir`" -name "*.so" | sed 's!^.*/!extension=!'

For each line, sed will match the longest string that starts at the beginning (^) and ends at /. It will always match everything up to and including the last /, because it is a greedy match, i.e., it will match everything but the filename. It then replaces that with extension=.

It ends up like so:

$ find "`php-config --extension-dir`" -name "*.so" | sed 's!^.*/!extension=!'

which seems to be what you want.

sed ought to be available everywhere, because it's part of the POSIX standard.

  • Ah, awesome! I tried sed, too, but my approach was to use a substitution - something along the lines of ... | sed 's/`php-config --extension-dir`/extension=/g' (this is probably wrong, but you get the picture), but it kept complaining due to the presence of / in the path. Let's see if others can come up with other ideas, but this is a good one! – Robert Rossmann May 21 '15 at 8:45
  • @RobertRossmann: You can do it that way as well, but you'd have to use a different separation character than /. (In case you didn't know, that character can be anything except a command letter, as long as it's the same all three times and doesn't occur in the pattern unescaped.) E.g. sed "s~`php-config --extension-dir`/~extension=~" works the way you intended. – marinus May 21 '15 at 8:48
  • Huh, nice one. sed's learning curve seems to me like a 90º uphill slope, but oh, the things you can do once on top... – Robert Rossmann May 21 '15 at 8:55

If you have a GNU find you can use -printf option

find `php-config --extension-dir` -name "*.so" -printf 'extension=%f\n' 
  • This looks great, too! Unfortunately, Mac do not support the -printf option so I cannot use this for my purposes. But thanks for introducing me to that switch! – Robert Rossmann May 22 '15 at 7:58

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