bash - Can't get wireshark -R working in unix shell -

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i following wireshark command working in unix shell (bash).

tshark -i host $ip -r 'udp.port == $port'

for reason tshark command doesn't see value in $port in between single quotes, variable id $port, script fails.

any info appreciated.

single quotes stop environment variables being evaluated. change double quotes allow shell expand variable. see following shell expansion differences

myport=1234 echo '$myport' echo "$myport"

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