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Top Forums Shell Programming and Scripting Continuous nc data acquisition fails ocassionally Post 303017886 by Chubler_XL on Wednesday 23rd of May 2018 09:38:47 PM
Old 05-23-2018
It would be interesting to see where the data is being lost.

Why don't you throw some tee commands in those pipelines and when it happens again you will know if it's nc awk or split that's losing the data:

Code:
nc -ul -p 56045 -q -1 -vv | tee /tmp/pre-awk.dat | awk -F: 'NF > 1 {print strftime("%d-%m-%Y %H:%M:%S"),$0  }' | tee /tmp/pre-split.dat | split -d -a3 -C 1M --additional-suffix=`date +_AIVDM_%F_%H%M%S`.txt - aivdm/ &

 

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tee(1)								   User Commands							    tee(1)

NAME
tee - replicate the standard output SYNOPSIS
tee [-ai] [file...] DESCRIPTION
The tee utility will copy standard input to standard output, making a copy in zero or more files. tee will not buffer its output. The options determine if the specified files are overwritten or appended to. OPTIONS
The following options are supported. -a Appends the output to the files rather than overwriting them. -i Ignores interrupts. OPERANDS
The following operands are supported: file A path name of an output file. Processing of at least 13 file operands will be supported. USAGE
See largefile(5) for the description of the behavior of tee when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of tee: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The standard input was successfully copied to all output files. >0 The number of files that could not be opened or whose status could not be obtained. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
cat(1), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.10 20 Dec 1996 tee(1)
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