Invocation strace |aa0000|{{options}}| |0000ff|{{program}}| |00aa00|{{arguments}}| Example strace |aa0000|*-e open* -o /tmp/strace.log| |0000ff|php| |00aa00|-v| cat /tmp/strace.log | grep ini Output open("/usr/local/php/7.0dev/bin/php-cli.ini", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/php/7.0dev/lib/php-cli.ini", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/php/7.0dev/bin/php.ini", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/php/7.0dev/lib/php.ini", O_RDONLY) = 3