Redirect the standard HCIDUMP output using GREP to a file

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Redirect the standard HCIDUMP output using GREP to a file

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#1 by (0 votes)

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I'm using a shell script to do HCIDUMP and using some filters to write to a file. With the following command, the destination file is empty.

hcidump -a l2cap | grep -v -e 'CAP' -e 'HCI' > onlystringsrecieved.txt

Using the same command without redirecting the output to a file, it works fine at the LXTerminal command prompt.

hcidump -a l2cap | grep -v -e 'CAP' -e 'HCI'

script grep bash shell

asked by anonymous 26.03.2017 / 05:48

1 answer

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score 0 · Answer 1

Probably the output of your interest is not in stdout but in stderr . Redirect stderr to stdout and check if there is any information in the file after the modification:

hcidump -a l2cap 2>&1 | grep -v -e 'CAP' -e 'HCI' > onlystringsrecieved.txt