My question is, how do i "disentangle" these lines, and have them return to the type of line-by-line output one would get with a tail -10?
Notice the double quotes around the subshell, which prevent the shell from evaluating the variables content and the missing "echo", which would do the same, eating away the newlines.
If i may suggest something you didn't ask: don't mix subshell commands "$(...)" and backticks "``". In fact don't use backticks at all! They are only supported for historical purposes and there is no reason at all why one should use them. It is perfectly possible to nest subshells:
but in your case you better skip the echo altogether and use the version stated above.
I have to test the directory name which is obtained from
for dir in `ls -l|grep $9 '
i need to check whether it is directory (
if yes, I have to check the first 3 character fo the directory
how can I do that? Please help me
thanks (3 Replies)
I have a file that contains the output of the ls -iR command, something like this:
./results:
2504641011 result_1410 2500957642 result_525
2504641012 result_1425 2500957643 result_540
./tests/1:
2500788755 1 2500788743 1000
./tests/2:
2500788759 3 2500788758 999
... (6 Replies)
I need to parse the following out put and determine if the USB is a DISK and whether or not it's External.
If an HBA line contains "USB" then does the next line contain
"DISK" and "External".
0:0,31,0: HBA : (aacraid,1) AAC SCSI
0,0,0: DISK : Adaptec ASR4800SAS Volu0001
... (6 Replies)
Hi,
I want to get an input from user and parse the input. The legal characters allowed in the input are alnum(a-zA-Z0-0), . , -
Also the first and las characters must be alnum only.
e.g
if the input is abc.ghh-sok.com then the script should return correct, and if the input is like... (2 Replies)
Hi,
From the above output of df command I need to parse only 43G (available space) and display it.
root@localhost:> df -h /vol1/joy
Filesystem Size Used Avail Capacity Mounted on
/vol1/joy 180G 137G 43G 76% ... (3 Replies)
Can someone help me? I have been looking in the archives as I am sure this is very simple to do, but I do not know.
I have a variable which sometimes contains a file name and sometimes contains a fully qualified file name.
I want to be able to separate the directory from the file name into 2... (3 Replies)
I'm trying to gather information on the interfaces on a large number of servers.
If I run ifconfig I will get: eth0 Link encap:Ethernet HWaddr 00:50:56:A2:27:C1
inet addr:10.145.xxx.xxx Bcast:10.152.45.255 Mask:255.255.254.0
-----
eth1 Link... (2 Replies)
Hi fellows,
I need to define a notification for SSL certificate expiration.
My Command output is below: (this is the "Expiration Date")
Tue Mar 15 09:30:01 2012
So, at 15th Feb (1 month before the expiration), a notification has to be triggered by a script or sth else. How can i set an... (5 Replies)
Anybody that's ever used nsupdate knows that it's error management is not very good.
I have a wrapper script that when it's got all the information it needs launches the nsupdate command.
This is my attempt at parsing the output to help support users quickly know if the command succeded or... (7 Replies)
Discussion started by: maverick72
7 Replies
LEARN ABOUT DEBIAN
logtop
LOGTOP(1) General Commands Manual LOGTOP(1)NAME
logtop - Realtime log line rate analyser
SYNOPSIS
logtop [OPTIONS]
DESCRIPTION
logtop is a System Administrator tool analyzing line rate on stdin.
It reads on stdin and print a constantly updated result
displaying, in columns:
Line number, count, frequency, and the actual line.
$ tail -f FILE | logtop
is the friendly version of:
$ watch 'tail FILE | sort | uniq -c | sort -gr'
OPTIONS -s, --size=K
Only keep K lines in memory, instead of 10000.
-q, --quiet
Do not display a live view of the data, only display a top at exit.
-l, --line-by-line=K
Print result line by line, in a machine friendly format, K is the number of result to print per line.
Line by line format is : [%d %f %s ]*
%d : Number of occurences
%f : Frequency of apparition
%s : String (Control chars replaced by dots.
-i, --interval=K
Interval between graphical updates, in seconds. Defaults to 1.
-h, --help
Show summary of options.
-v, --version
Show version of program.
EXAMPLES
Here are some logtop usage examples.
tail -f cache.log | grep -o "HIT|MISS" | logtop
Realtime hit / miss ratio on some caching software log file.
tail -f access.log | cut -d' ' -f1 | logtop -s 10000
Realtime most querying IPs on your server, as long as log lines in access.log starts with the client IP.
tail -f access.log | cut -d' ' -f7 | logtop -s 10000
Realtime most requested web pages in a NCSA like log file.
cat auth.log | grep -v "CRON" | grep -o ": .*" | logtop -q -s 100000
Display a one-shot simple analyse of your auth.log.
SEE ALSO watch(1)AUTHOR
logtop was written by Julien Palard.
This manual page was written by Julien Palard <julien@palard.fr>, for the Debian project (and may be used by others).
April 16, 2011 LOGTOP(1)