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$cmd =
"zcat *.gz \| grep -P \'\\!dataset\' \| grep -P \'\\=\'  \| perl -pi -
+e s\'\/^\\!dataset\\_\|\\=\.*\/\/g\' | sort | uniq  >VARIABLES";
print "$cmd\n";
system($cmd);

^DATABASE = Geo
!Database_name = Gene Expression Omnibus (GEO)
...
3    EMPTY    0.191    0.243    0.312    0.023    0.158    0.261    0.
+255    0.128
4    EMPTY    -0.013    -0.041    0.112    -0.028    0.175    0.111   
+ 0.139    0.137
etc