2
votes
1answer
49 views

Piping periodic data between Python scripts

How to receive data from the environment e.g. bash I am trying to launch two Python scripts in bash and pipe stdout from one of them to stdin of the other. The first script outputs a single ...
4
votes
0answers
72 views

Combing head and tail in a single call via pipe [duplicate]

On a regular basis, I am piping the output of some program to either head or tail. Now, suppose that I want to see the first AND last 10 lines of piped output, such that I could do something like ...
4
votes
3answers
742 views

How can I do the equivalent of tail -f with ls? [duplicate]

Possible Duplicate: Is it possible to follow a command (run repeatedly)? as one would follow a file using tail -f? I would like to monitor files that are being downloaded to a directory in ...
1
vote
1answer
2k views

Flush 'tail -f' buffer?

I'm using the following statement (simplified version): tail -f -c+1 <filename> in order to pipe a file to a process. What I've found, though, is that there is a number of lines at the end ...
1
vote
2answers
560 views

Is there any other way to use tail -f for grep -q && operation?

I found this solution: http://stackoverflow.com/questions/7178888/grep-q-not-exiting-with-tail-f but is there any other possible? UPD: I want to do tail -f | grep -q something && echo ...
7
votes
4answers
696 views

What is the easiest way to execute text from tail at the command line?

Sometimes I'm working on a new (ubuntu) box and I type git and am alerted: The program 'git' is currently not installed. You can install it by typing: apt-get install git-core If that happens I ...
3
votes
1answer
134 views

Why does tailing an output log sometimes give partial lines?

Sometimes, tailing an output log which is constantly being updated doesn't give the whole lines. Why is that? grep pattern input_file > output.log & tail output.log Why doesn't it print the ...
4
votes
2answers
1k views

Follow a pipe using less?

Can less follow (by pressing F) a piped input (similarly to a file)? For a file that is being written to, the command less <file> will follow the file when pressing F. But if I have a ...
5
votes
2answers
387 views

Is it possible to follow a command (run repeatedly)? as one would follow a file using tail -f?

I have a script which produces a file 'Detail.out'. I know that the script is completed whenever the file contains a certain number of lines (roughly 21025). So I find myself sitting at the command ...