Passing resulted string name of a gzipped file as an argument to another piped tool


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# 1  
Passing resulted string name of a gzipped file as an argument to another piped tool

Hi,

I have a .pcap.gz file and I would like to initially gzip it and then pass the resulting .pcap filename as an argument to a piped tool; the right-hand tool is not standardized linux tool but a custom one that strictly requires the string name of a given .pcap file in order for the pcap file to be processed. Anyhow,

For example, the tool works fine if i state the following on an already unzipped file :
Code:
./my_tool -I -C source="file.pcap" > text_format_of_pcap

I've tried the following just to check on whether it would work directly on a gzipped (however as anticipated it didn't):

Code:
gzip -c myfile.pcap.gz > ../mydirectory/ | my_tool -I -C

Therefore, I was wondering on whether there is a way to use stdin or something else to do that?

Thanks in advance
# 2  
Doesn't work that way. It wouldn't have a real file name, in any case; it'd try to open a file and complain that it didn't exist.

A named pipe may be useful. It'll effectively be a file my_tool can open, but acts like a pipe written to by something else.

Whatever process opens it freezes, though, until something else opens it too. So the writing process has to open it in the background.

Code:
mkfifo filename.pcap

( exec gunzip < filename.pcap.gz > filename.pcap & )

./my_tool filename.pcap

rm filename.pcap


Last edited by Corona688; 04-20-2015 at 04:39 PM..
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# 3  
Thank you Corona, it worked just perfect! However, now I need to do this process for a bunch of *.pcap.gz files and I'll try to integrate your suggestion in a shell script. Cheers!
This User Gave Thanks to amarn For This Post:
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