Weird output when trying to convert sam to bam!

Question

[Parham]

Hi,

I have mapped my reads using STAR. Then I am trying to convert the output SAM file to BAM using code below but I get a strange respond. Could somebody tell what I am doing wrong? Thanks in advance.

samtools view -Sb Aligned.out.sam aligned.bam
[samopen] SAM header is present: 6 sequences.
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[main_samview] random alignment retrieval only works for indexed BAM files.
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Answer 1

[Pierre Lindenbaum]

You need to specify the output '-o (out.bam)' argument

samtools view -Sb -o aligned.bam Aligned.out.sam

[Parham]

Oops, sure I need to. Thanks a lot!