I want to check a log file that gets updated very frequently, almost every second. What I want to do from a script is to check this log file
1) for a particular string
2) for a specified time
while it is getting updated. And as soon as it finds that particular string the command should stop.
I got the information from this forum which will satisfy the need 1)
but now I am looking how can a specify time for which the log file should be checked.
Originally Posted by Annihilannic
Try:
Code:
No need for a kill, the tail should terminate automatically when the pipe is closed.
Above is the code I used to check the log file for a particular string and exit when it is found. But now I want to specify time for which the log file should be checked and if the string is not found in the specified time then tail stop. Is it possible?
Hi
My five script run throgh crontab at same time at 6 clock.
Due to problem in the data load .Now I want to check time of load finish run these jobs. I create a script which check the load finish time but I have no idea how I run these JObs. This is very urget to me. Please reply me as soon... (3 Replies)
Hello guys, I am new at shell scripting and I want to create a script that runs several commands at a time, ie: uptime, w, df -h and so on and send the output of this commands to a text file so it can be send via email at a certain time using crontab.
Any help will be much appreciated! (4 Replies)
Hi,
I have a log file without date/time, and I want that everytime tail|grep find something it displays the date/time and the line. I have tried something like this command but without any luck to display the date/time:
tail -F catalina.out | sed "s/^/`date `/" | egrep ... (6 Replies)
We have recently downloaded, installed and compiled gcc-3.0.4 code. gcc compiler has built successfully and we where able to compile some same test cpp file. I would like to know how we can modify gcc source code so that we add additional run time debugging statements like the binary in execution... (4 Replies)
How to tail -f real time file.
I want to tail file created last time.
The server is gen new file Always.
.
An example file.
-rw-r--r-- 1 shinnie tiituck 251M Oct 18 05:39 20111018_00.log
-rw-r--r-- 1 shinnie tiituck 251M Oct 18 11:18 20111018_01.log
-rw-r--r-- 1 shinnie tiituck... (3 Replies)
hi
i need to run from a bash script
tail -f /var/log/access_log >> access1
tail -f /var/log/prod/prod1 >> access1
tail -f /var/log/prod/prod2 >> access1
this script purpose is to start at server boot time
and should always run.
what is the best way to put it on a script
Thanks
Dan (1 Reply)
Hi Guys,
I am developing a script to monitor log file Generated every hour.
When creating a new file scripts not working.
My Code . I want to monitor GatewayTransaction.yyyymmdd-hh.log
while true; do newdate=$(date '+%Y%m%d') ; nowdate=$(date '+%Y%m%d-%H.log'); tail -f... (7 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)
Hi
I have a file which is updated very frequently.
Where in i wanted to use tail -f command in the script and wanted to grep for a particular word.
But the issue is when i use tail -f filename|grep "word" ...
it will show me blank until the word is found in the real time. if it shows... (13 Replies)
Discussion started by: nikhil jain
13 Replies
LEARN ABOUT FREEBSD
tail
TAIL(1) BSD General Commands Manual TAIL(1)NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus ('-') sign
or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default start-
ing location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number.
If the file being followed does not (yet) exist or if it is removed, tail will keep looking and will display the file from the begin-
ning if and when it is created.
The -F option is the same as the -f option if reading from standard input rather than a file.
-n number
The location is number lines.
-q Suppresses printing of headers when multiple files are being examined.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
the file unless -q flag is specified.
EXIT STATUS
The tail utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To display the last 500 lines of the file foo:
$ tail -n 500 foo
Keep /var/log/messages open, displaying to the standard output anything appended to the file:
$ tail -f /var/log/messages
SEE ALSO cat(1), head(1), sed(1)STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD March 16, 2013 BSD