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use File::chdir;
chdir '$dir/Hsapiens_fasta_folder'; ... chdir '$dir/targetp-1.1';
chdir '$dir/Hsapiens_fasta_folder' or warn "Cannot chdir to '$dir/Hsap +iens_fasta_folder' because: $!"; ... chdir '$dir/targetp-1.1' or warn "Cannot chdir to '$dir/targetp-1.1' b +ecause: $!";