1
vote
2answers
79 views

Temporarily freeze a process upon shell interaction

Let's say on a single console I have tail -F running, showing the output of many log files in realtime. Sometimes I need to run commands there too, however, and examine their output briefly, without ...
8
votes
4answers
3k views

Grep from the end of a file to the beginning

I have a file with about 30.000.000 lines (Radius Accounting) and I need to find the last match of a given pattern. The command: tac accounting.log | grep $pattern gives what I need, but it's too ...
4
votes
5answers
345 views

Only output most recent 10 (or n) lines of a lengthy command output

I have currently worked alot with shell and bash on linux. I have made tons of backups scripts and much more. In many cases I have a command that outputs thousands of lines. I actually need these ...
1
vote
4answers
517 views

Tail -f the most recent log file

In a few spots I got this to work ls -rt /path/to/log/file/ | tail -1 | xargs tail -f But I can't figure out why it won't always work (This is quick fix until I get the log rolling fixed here)
11
votes
4answers
1k views

How to do a continous 'wc -l' with gnu texttools?

I know of course that cat logfile.txt | wc -l 120 will tell me the number of lines in a file. Whereas tail -f logfile.txt will show me the new lines that another program writes to logfile.txt. ...
4
votes
3answers
1k 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
3answers
390 views

Is there a way to beep when tail -F stops to fetch new results?

A few days ago I asked Is there a way to make tail -F beep? Now I want to know if there is any way to use *nix utilities, to beep when a tail -F stops returning new lines for a while! I know, I ...
2
votes
2answers
2k views

How to execute this particular shell command from Python?

OK, so, I have this non-functional shell script, which I am rewriting piece by piece in python, except I am getting an "unexpected "|" error" from the shell (see below): #/bin/sh LINES=`cat $@ | wc ...
11
votes
7answers
10k views

grep and tail -f?

Is it possible to do a tail -f (or similar) on a file, and grep it at the same time? I wouldn't mind other commands just looking for that kind of behavior.