genome.info is created with 0 bytes

[MariusHoh]

samtools view -H ATACseq.sorted.bam| perl -ne 'if(/^@SQ.*?SN:(\w+)\s+LN:(\d+)/){print $1,"\t",$2,"\n"}' > genome.info results in an empty genome.info file

I am using UBUNTU 20.04.5

Does anyone have any suggestion?