I was going to suggest binlib's solution, above, although the standard "tail -f" command might not work after a log rotation. The tail from GNU's coreutils will follow the file opened, not the name of the file, unless you do:
But given that you want the most recent occurrence of a pattern before a second pattern occurs, try this (again, gawk or nawk or mawk):
You'll need to put your own stuff where you see italicized words
Hi frndz,
i have a flat file like,
xxx yyy zzz sss aaa bbb yyy xxx rrr sss ttt yyy ddd zzzz cccc..
look, in this file i want to fetch the substring from one yyy to another one and need to print it then from next values between yyy's..
can you please give me some inputs on this..
... (10 Replies)
Hi,
I need to check if a particular name is already in the file or not and i am using following code for this...
match=$(grep -n -e "$output1" outputfiles.txt )
where output1 is the variable name having names in it and outputfiles.txt is the file name ..and i am using ksh
can anybosy... (6 Replies)
Hi all, I am trying to write a command that can help me count the number of lines in the /etc/passwd file ending in bash.
I have read through other threads but am yet to find one indicating how to locate a specifc word at the end of a line. I know i will need to use the wc command but when i... (8 Replies)
Hi,
I am trying to locate the occurences of certain pattern like 'Possible network disconnect' in a text file. I can get the actual lines matching the pttern using:
grep -w 'Possible network disconnect' file_name.
But I am more interested in getting the timing of these events which are... (7 Replies)
Hi,
I am trying to develop a script which should find a word if a particular word exists.
Below is the content of the file.
insert_job: test_job ----> job name
days_of_week: all
start_times: "16:00"
date_conditions: 1
insert_job: test_job2 ----> job name
days_of_week: all... (16 Replies)
Hi,
I have to search a word in a text file and then I have to delete lines above from the word searched . For eg suppose the file is like this:
Records
P1
10,23423432
,77:1
,234:2
P2
10,9089004
,77:1
,234:2
,87:123
,9898:2
P3
456456
P1
:123,456456546
P2
abc:324234 (2 Replies)
So the tag for this forum says all newbies welcome...
All I want to do is go through my file and find lines which contain a given string of characters then replace these with a blank line. I really tried to find a simple command to do this but failed.
Here's what I did come up with though:
... (2 Replies)
i want to find the no:of occurrences of a word in a file
cat 1.txt
unix script unix script
unix script unix script unix script unix script
unix script unix script unix
unix
script
unix script unix script now i want to find , how many times 'unix' was occurred
please help me
thanks... (6 Replies)
Hello,
in a AIX system : AIX CDRATE01 2 7 00FAB3114C00
my following commande give the result :
LISTE /tmp/RESS
****************************************************************
Liste
TYPE = XXXXXXX
EX = YYYY
VER ... (13 Replies)
I have a text file that has some data like:
PADHOGOA1 IOP055_VINREG5_1 ( .IO(VINREG5_1), .MONI(), .MON_D(px_IOP055_VINREG5_1_MON_D), .R0T(px_IOP054_VINREG5_0_R0T), .IO1() );
PADV30MA0 IOP056_VOUT3_IN ( .IO(VOUT3_IN), .V30M(px_IOP056_VOUT3_IN_V30M));
PADV30MA0 IOP057_VOUT3_OUT (... (2 Replies)
Discussion started by: utkarshkhanna44
2 Replies
LEARN ABOUT SUSE
tail
TAIL(1) User Commands 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.
-c, --bytes=N
output the last N bytes; alternatively, use +N to output bytes starting with the Nth of each file
-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; or use +N to output lines starting with the Nth
--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
--retry
keep trying to open a file even when it is or becomes inaccessible; useful when following by name, i.e., with --follow=name
-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 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB
1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y.
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 tail bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
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 coreutils 'tail invocation'
should give you access to the complete manual.
GNU coreutils 7.1 July 2010 TAIL(1)