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Imagine you've started a long-running process that involves piping data,
but you forgot to add the progress-bar option to a command.
e.g.
xz -dc bigdata.xz | complicated-processing-program > summary
.
This command uses lsof to see how much data xz has read from the file.
lsof -o0 -o -Fo FILENAME
Display offsets (-o), in decimal (-o0), in parseable form (-Fo)
This will output something like:
.
p12607
f3
o0t45187072
.
Process id (p), File Descriptor (f), Offset (o)
.
We stat the file to get its size
stat -c %s FILENAME
.
Then we plug the values into awk.
Split the line at the letter t: -Ft
Define a variable for the file's size: -s=$(stat...)
Only work on the offset line: /^o/
.
Note this command was tested using the Linux version of lsof.
Because it uses lsof's batch option (-F) it may be portable.
.
Thanks to @unhammer for the brilliant idea.
Show Sample Output
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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sudo lsof | egrep 'w.+REG' | awk '{print $10}' | sort | uniq -c | sort -n
. Then @sesom came up with a smarter solution: http://www.commandlinefu.com/commands/view/14440lsof -a -d 1-99 -Fn / | grep ^n | cut -b2- | sort | uniq -c | sort -n