sed -n ‘10000000,10000020p’ filename You might be able to speed that up a little like this: sed -n ‘10000000,10000020p; 10000021q’ filename In those commands, the option -n causes sed to “suppress automatic printing of pattern space”. The p command “print[s] the current pattern space” and the q command “Immediately quit[s] the sed script without processing … Read more
So, this is coming quite late, but I ran into the same problem again, and there’s a much better solution now. Just use pygtail: Pygtail reads log file lines that have not been read. It will even handle log files that have been rotated. Based on logcheck’s logtail2 (http://logcheck.org)
Use the -wait parameter with Get-Content, which displays lines as they are added to the file. This feature was present in PowerShell v1, but for some reason not documented well in v2. Here is an example Once you run this, update and save the file and you will see the changes on the console.
You don’t see anything, because of buffering. The output is shown, when there are enough lines or end of file is reached. tail -f means wait for more input, but there are no more lines in file and so the pipe to grep is never closed. If you omit -f from tail the output is shown immediately: @EdMorton is right of course. Awk can search for A1 as well, … Read more