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T-Dawg

Forum Fellow

From: Charlotte, NC

Registered: 2005-01-29

Posts: 2,736

seek a file in bash?

I have serial device /dev/ttyS0 that I need to read the first byte from. Using cat /dev/ttyS0 will not return me to a new line which is what I need. I'm sure there's simple command for it but I can't find it..

EDIT: I believe in perl it went something like

sysread(F2, '/dev/ttyS0', 1)

byte

Member

From: Düsseldorf (DE)

Registered: 2006-05-01

Posts: 2,046

Re: seek a file in bash?

Use 'dd'?

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phrakture

Arch Overlord

From: behind you

Registered: 2003-10-29

Posts: 7,879

Website

Re: seek a file in bash?

dd is what you want.... as a guess

dd if=/dev/ttyS0 count=1

hmmm actually that gives me an input/output error... not sure why, but dd should do what you want assuming you can read the node.

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http://phraktured.net

T-Dawg

Forum Fellow

From: Charlotte, NC

Registered: 2005-01-29

Posts: 2,736

Re: seek a file in bash?

thanks guys

status=$(dd if=/dev/ttyS0 bs=1 count=1 2>/dev/null)

worked like a charm