An alternate may be to open the file with tail and keep it open.
What is your overall aim for this process? You might be able to:-
I think that the < <(command) is a bash construct rather than sh or ksh so it depends if you have that or even if this is appropriate. This process will not end, but continue reading the log file when new records are written, so it's near-time (strictly not quite real-time)
Beware that the log file will remain open, so if you rotate your log files, you might need to use tail -F $logfile instead to open the replacement file.
Can you tell us what the point of this code is to be? There may be a simpler way that I'm not thinking of. It would be useful to know the OS version (output from uname -a) and shell that you are using.
Hello All,
Plz help me with:
I have a csv file with data separated by ',' and optionally enclosed by "". I want to check each of these values to see if they exceed the specified string length, and if they do I want to cut just that value to the max length allowed and keep the csv format as it... (9 Replies)
#!/usr/bin/ksh
exec 0<property
while read newReceiveDir
do
if
then
sed -e 's//home/joshua/bodi/data/receive/{$newReceiveDir:25}/g/' mp_validate.sh >| mp_validate.sh
elif
then
sed -e 's//home/joshua/bodi/data/temp/{$newReceiveDir:22}/g/' mp_validate.sh >| mp_validate.sh ... (1 Reply)
In a file a pattern is occured many times randomly. Even it may appear more then once in the same line too. How i can get the number of times that pattern appeared in the file? let the file name is abc.txt and the pattern is "xyz".
I used the following code:
grep -ic "xyz" abc.txt
but it is... (3 Replies)
I need a script for...
how to find a position of column data and print some string in the next line and same position
position should find based on *HEADER8* in text
for ex: ord123 abs 123 987HEADER89 test234
ord124 abc 124 987HEADER88 test235
... (1 Reply)
here is what i want to achieve... consider a file contains below contents. the file size is large about 60mb
cat dump.sql
INSERT INTO `table1` (`id`, `action`, `date`, `descrip`, `lastModified`) VALUES (1,'Change','2011-05-05 00:00:00','Account Updated','2012-02-10... (10 Replies)
Hi,
I need to search a file for a pattern,replace some other word and write a word at its 72nd position.
For example,
My name is Mano.Im learning Unix.
I want to search the file in all lines containing the word "Mano".In that matched line,replace the word "Unix" with "Java".And... (5 Replies)
I need to check 1 log file, which is logging:
2014-08-18T09:10:39+02:00 user: XXXXX START FEATURE
2014-08-18T09:10:39+02:00 user: XXXXX FINISH FEATURE
I first need to check that the START FEATURE starts and finish on the same time/date for the same user, which is different each time START... (2 Replies)
Hi,
I have a file with multiple lines(fixed width dat file). I want to search for '02' in the positions 45-46 and if available, in that lines, I need to replace value in position 359 with blank. As I am new to unix, I am not able to figure out how to do this. Can you please help me to achieve... (9 Replies)
hi ,
i have a file test.dat which contains following data.
test.dat
XY|abc@xyz.com
XY|abc@xyz.com
ST|abc@xyz.com
ST|abc@xyz.com
ST|XYZ@abc.com
FK|abc@xyz.com
FK|STG@xyz.com
FK|abc@xyz.com
FK|FKG@xyz.com
i want to know the count of XY,ST,FK.
i.e XY = 2 , ST = 3 , FK = 4
I am... (4 Replies)
Discussion started by: itzkashi
4 Replies
LEARN ABOUT X11R4
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=[+]NUM
output the last NUM bytes; or use -c +NUM to output starting with byte NUM of each file
-f, --follow[={name|descriptor}]
output appended data as the file grows;
an absent option argument means 'descriptor'
-F same as --follow=name --retry
-n, --lines=[+]NUM
output the last NUM lines, instead of the last 10; or use -n +NUM to output starting with line NUM
--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);
with inotify, this option is rarely useful
--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 if it is inaccessible
-s, --sleep-interval=N
with -f, sleep for approximately N seconds (default 1.0) between iterations; with inotify and --pid=P, check process P at least once
every N seconds
-v, --verbose
always output headers giving file names
-z, --zero-terminated
line delimiter is NUL, not newline
--help display this help and exit
--version
output version information and exit
NUM 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 in a way that accommodates renaming,
removal and creation.
AUTHOR
Written by Paul Rubin, David MacKenzie, Ian Lance Taylor, and Jim Meyering.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report tail translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 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 head(1)
Full documentation at: <http://www.gnu.org/software/coreutils/tail>
or available locally via: info '(coreutils) tail invocation'
GNU coreutils 8.28 January 2018 TAIL(1)