I exceuted your lines like this but no result

 my $cmd = 'cd /waslogs1/vfoneLog/cposapp && ls -lrt | grep -i "'. $gr
+ep_date. q(" | awk '{ print $9 }' > /home/cpos/CRM_Reports/output/fil
+elist.txt);
system $cmd;
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filelist.txt is not written