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Buffering issue when looking at netcat output

I have problem I am trying to understand: I am sending some UDP data to local host. It is a simple UDP packet with a counter. It counts up to 16 (0xF) and stops. When I grep the received data on the ...
1
vote
1answer
107 views

Can't grep output of apt-get

If I run: apt-get install --dry-run 2klic-embedded-gui=*-master I get: Reading package lists... Done Building dependency tree Reading state information... Done 2klic-embedded-gui is already ...
1
vote
3answers
3k views

piped command after grep not working

I want to monitor a file. So I have tailed a file using below command, to execute a script per line. tail -3f logfile.log | grep "action.*add" | sed -u -e "s/^/'/" -e "s/$/'/" | xargs -L 1 -P 5 bash ...
5
votes
3answers
661 views

Why does this one-liner fail to produce output? [duplicate]

The following produces nothing in bash: while true ; do upower -d ; sleep 1 ; done | grep percentage | uniq I've discovered that it doesn't matter what the last- or even the second to last- program ...
1
vote
5answers
2k views

Display output to console while grep is used

In vim I use the following command to compile a tex file: pdflatex\ \-file\-line\-error\ \-shell\-escape\ \-interaction=nonstopmode\ $*\\\|\ grep\ \-P\ ':\\d{1,5}:\ ' this works in terms of getting ...