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    -r  File is readable by effective uid/gid.
    -w  File is writable by effective uid/gid.
...
    -M  Script start time minus file modification time, in days.
    -A  Same for access time.
    -C  Same for inode change time (Unix, may differ for other platfor
+ms)

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my $file = './thefile.sh';
print "File exists and seems to contain data" 
if (-e $file && -f $file && (-s $file) > 0);