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my $num_subs = `perl -w -0777 -pi -e 'my \$c=s/foo/bar/g;print STDOUT 
+"\$c\\n"' ./foo_test`;
die("Can't execute child: $!\n" if $? == -1'
...
die("Child exited with error ".( $? >> 8 )."\n") if $? >> 8;

chomp($num_subs);

my $num_subs = `perl -i -0777wpe'print STDOUT s/foo/bar/g' foo_test`;
die("Can't execute child: $!\n" if $? == -1'
die("Child killed by signal ".( $? & 0x7F )."\n") if $? & 0x7F;
die("Child exited with error ".( $? >> 8 )."\n") if $? >> 8;

use String::ShellQuote qw( shell_quote );

...
die("Can't execute child: $!\n" if $? == -1'
die("Child killed by signal ".( $? & 0x7F )."\n") if $? & 0x7F;
die("Child exited with error ".( $? >> 8 )."\n") if $? >> 8;

use IPC::System::Simple qw( capturex );   # Core module

my @cmd = ( 'perl', '-i', '-0777wpe', 'print STDOUT s/foo/bar/g', 'foo
+_test' );
my $num_subs = capturex(@cmd);
die("Child exited with error ".( $? >> 8 )."\n") if $? >> 8;

my $num_subs = 0;
{
...
   local $/;
   $num_subs += s/foo/bar/g while <>;
}