Working in HP-UX 10.20. I eventually want to write a bourne shell script to handle the following problem, but for now I am just toying with it at the command line.
Here's what I am basically trying to do:
tail -f log_X | grep n > log_Y
I am doing a tail -f on log_X . Once it sees "n", I... (6 Replies)
Hello all,
I have search the forum and could not find an answer...Here is what I am trying to do. Every 15 minutes, a script send uptime output to a logfile (dailylog.log), that file contains lines like the one below:
11:21am up 44 days, 19:15, 1 user, load average: 0.00, 0.02, 0.03
... (7 Replies)
I am trying to extract a particular line from a.log which keeps appending every sec and output that into a newfile b.log which should append itself with filtered data received from a.log
I tried
tail -f a.log |grep fail| tee -a b.log
nothing in b.log
tail -f a.log |grep fail >>b.log
... (4 Replies)
Hi Everyone ,
I am facing a strange problem
i have made the follwing script to watch a appending log file (abc.log) but its not moving after the line tail -f ,
any suggestions
=====================================
#!/bin/bash
while true
do
tail -f abc.log | grep "exceptions"
echo hi... (12 Replies)
Hi ,
I have Continuous updating log file. I want to continuously scan that file using "tail -f " and execute a shell command like "date" command when that particular keyword is detected .
I am using awk to acheive it but not suceeded so far. However when I use "cat" instead of tail -f this... (3 Replies)
Hi All,
Although each line below seems to work by itself, I've been having trouble getting the Control-C trap working when I add the "|perl -pe..." to the end of the tail -f line, below.
(That |perl -pe statement basically just adds color to highlight the word "ERROR" while tailing a log... (2 Replies)
Hi,
I want to write a script which will tail a particular file for 15 mins and then sleep for 10 mins and again tail for 15 mins. This cycle will go on for a limited period of time.
How can i ensure that tail command will run for 15 mins before calling sleep command
Thanks (6 Replies)
I have 250 files that have 16 columns each - all numbered as follows stat.1000, stat.1001, stat.1002, stat.1003....stat.1250.
I would like to join all 250 of them together tail by tail as follows. For example
stat.1000
a b c
d e f
stat.1001
g h i
j k l
So that my output... (2 Replies)
because the tail +2 on the first line gives me the file name pomga I do not want anything like what I miss
tail +2 ejemplo.txt
ouput
==> ejemplo.txt <==
1
2
3
4
5
6
7
8
9
10 (2 Replies)
Hi Team,
I have written the shell script which returns the result of the disk space filesystems which has crossed the threshold limit in HTML Format. Below mentioned is the script which worked perfectly on QA system.
df -h | awk -v host=`hostname` '
BEGIN {
print "<table border="4"... (13 Replies)
Discussion started by: Harihsun
13 Replies
LEARN ABOUT REDHAT
tail
TAIL(1) FSF TAIL(1)NAME
tail - output the last part of files
SYNOPSIS
tail [OPTION]... [FILE]...
DESCRIPTION
Print the last 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With
no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
--retry
keep trying to open a file even if it is inaccessible when tail starts or if it becomes inaccessible later -- useful only with -f
-c, --bytes=N
output the last N bytes
-f, --follow[={name|descriptor}]
output appended data as the file grows; -f, --follow, and --follow=descriptor are equivalent
-F same as --follow=name --retry
-n, --lines=N
output the last N lines, instead of the last 10
--max-unchanged-stats=N
with --follow=name, reopen a FILE which has not changed size after N (default 5) iterations to see if it has been unlinked or
renamed (this is the usual case of rotated log files)
--pid=PID
with -f, terminate after process ID, PID dies
-q, --quiet, --silent
never output headers giving file names
-s, --sleep-interval=S
with -f, sleep for approximately S seconds (default 1.0) between iterations.
-v, --verbose
always output headers giving file names
--help display this help and exit
--version
output version information and exit
If the first character of N (the number of bytes or lines) is a `+', print beginning with the Nth item from the start of each file, other-
wise, print the last N items in the file. N may have a multiplier suffix: b for 512, k for 1024, m for 1048576 (1 Meg).
With --follow (-f), tail defaults to following the file descriptor, which means that even if a tail'ed file is renamed, tail will continue
to track its end. This default behavior is not desirable when you really want to track the actual name of the file, not the file descrip-
tor (e.g., log rotation). Use --follow=name in that case. That causes tail to track the named file by reopening it periodically to see if
it has been removed and recreated by some other program.
AUTHOR
Written by Paul Rubin, David MacKenzie, Ian Lance Taylor, and Jim Meyering.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for tail is maintained as a Texinfo manual. If the info and tail programs are properly installed at your site, the
command
info tail
should give you access to the complete manual.
tail (coreutils) 4.5.3 February 2003 TAIL(1)