tail

I need to remote tail log files such that the tailing continues working even when the file is rolled over. My attempts to do so, started by directly using the tail command over ssh: ssh root@some-remote-host tail -1000f /some-directory/application.log | tee /c/local-directory/applicaiton.log That allows me to filter through /c/local-directory/applicaiton.log locally using Otroslogviewer (which was the original purpose of trying to tail the log file locally). The above stops tailing when the remote log file is rolled over (which happens at every 10MB). I do not have the access required to

I need a script that will run a series of tail -f commands and output them into a file. What I need is for tail -f to run for a certain amount of time to grep specific words. The reason it's a certain amount of time is because some of these values don't show up right away as this is a live log. How can I run something like this for let's say 20 seconds, output the grep command and then continue on to the next command? tail -f /example/logs/auditlog | grep test Thanks timeout 20 tail -f /example/logs/auditlog | grep test tail -f /example/logs/auditlog | grep test & pid=$! sleep 20 kill $pid

OK this might appear to be an easy question but I couldn't find the answer from here so I am posting it in hope someone might have encountered the similar problem. I need to monitor a symlink which points to a web server file ( /var/log/lighttpd/error.log to be more specific, thanks to Linus G Thiel I figured out how to follow symlinks ). I know I can set up fs.fileWatch to monitor it but I should also point out that the error.log file also got rotated at a specific time, depending on whatever the log daemon settings are. When that happens, fs.fileWatch stops working. I also know I can spawn a

Looking for input on how to solve the following problem. My ColdFusion 9 app has a simple logger that writes text to a file. On my dev machine, the file is local so I can use either 'tail -f' or CFB's TailView to watch it. I'd like a tool to watch it when it's deployed on the production server. The catch: production is at a shared CF hosting provider which doesn't allow RDS file access or a directory-watcher gateway. I'm wondering about a page with a meta refresh tag or if I want to get more fancy, something AJAXy to the same effect. Thoughts? Any tools that already exist for this? I may

I want to say output lines 5 - 10 of a file, as arguments passed in. How could I use head and tail to do this? where firstline = $2 and lastline = $3 and filename = $1 . Running it should look like this: ./lines.sh filename firstline lastline sfstewman Aside from the answers given by fedorqui and Kent , you can also use a single sed command: #! /bin/sh filename=$1 firstline=$2 lastline=$3 # Basics of sed: # 1. sed commands have a matching part and a command part. # 2. The matching part matches lines, generally by number or regular expression. # 3. The command part executes a command on that

I use the head(d) and tail(d) methods in R package utils a lot - frequently one after the other. So i wrote a simple wrapper for the two functions: ht <- function(d, m=5, n=m){ # print the head and tail together cat(" head --> ", head(d,m), "\n", "--------", "\n", "tail --> ", tail(d,n), "\n") } And i got some unexpected results ... can someone please help me understand why? (so i can fix it ... or at least understand your solution!). Some background... Numeric is fine: x <- 1:100 ht(x) As is complex: ni <- as.complex(1:100) ht(ni) and character: ll <- letters[1:26] ht(ll) Matrix loses it's

I'm wondering if util code already exists to implement some/all of *NIX tail. I'd like to copy the last n lines of some file/reader to another file/reader, etc. This seems like a good bet: Tailer Library . This implementation is based on it, but isn't the same. Neither implement a lookback to get the last 100 lines though. :( You could take a look at this tail implementation in one of Heritrix 's utility classes. I didn't write it but I wrote the code that uses it, works correctly as far as I can tell. This is a UI app - you can look at the source though to see what it does (basically some