One way to do it would be to run the tail/awk pipe in a background subshell, redirect that output to a temp file, and have the parent script terminate the subshell when the file is 3 lines long.
Some rough (and untested!) code:
These 2 Users Gave Thanks to CarloM For This Post:
Hi all,
I've a structure let's say
typdef struct a { int a; int b; char* string} b;
I need to make the function smth like readdir(), returning everytime it's called pointer to the next structure. Let's say functions would read the next file in the directory and all the permitions put it in... (2 Replies)
Hello
I wander if im doing :
ls -l and its giving me lets say 3 results :
-rw-r--r-- 1 blah other 1789 May 19 2003 foo.c
-rw-r--r-- 1 blah other 1014 May 19 2003 foo.h
-rw-r--r-- 1 blah other 270 May 19 2003 foo1.c
now I would like to use the first... (1 Reply)
Hello,
i am trying to write a script file in awk which yields me the number of lines,characters and words, i checked it many many times but i am not able to find any mistake in it. Please tell me where i went wrong.
BEGIN{
print "Filename Lines Words Chars\n"
}
{
filename=filename + 1... (2 Replies)
Please help in the following problem:
Input is:
Pritam
123
456
Patil
myname
youname
Pritam
myproject
thisproject
iclic
Patil
remaining text
some more text
I need the command which will display the no of lines between two words in the whole file.
e.g. Display all the no of lines... (5 Replies)
hello,
i 'd like your help about a bash script which:
1. finds inside the html file (it is attached with my post) the code number of the Latest Stable Kernel,
2.finds the link which leads to the download location of the Latest Stable Kernel version,
(the right link should lead to the file... (3 Replies)
Hi everybody,
i have this biological situation to fix:
> Id.1
ACGTACANNNNNNNNNNNACGTGCNNNNNNNACTGTGGT
>Id.2
ACGGGT
>Id.3
ACGTNNNNNNNNNNNNACTGGGGG
>Id.4
ACGTGCGNNNNNNNNGGTCANNNNNNNNCGTGCAAANNNNN
........
....
These are nucleotidic sequences with some "NNNN..." always of the same... (4 Replies)
Hi,
I have a requirement to to an ldapsearch and remove the shadow attributes in the output file.
What I do is ldapsearch() | operation to remove shadow > FILE
The ldapsearch gives output like this(with same line formation):
objectClass: FSConfig
objectClass: extensibleObject
fsCAIP:... (10 Replies)
Hey everyone!
I have a tab delimited data set which I want to create an output contained the calculation of number of those lines with a certain value in 2nd and 3rd column.
my input file is like this:
ID1 1 10M AAATTTCCGG
ID2 5 4M ACGT
ID3 5 8M ACCTTGGA
ID4 5 ... (7 Replies)
Hi ,
I need to count the number of errors associated with the two words occurring in the file. It's about counting the occurrences of the word "error" for where is the word "index.js". As such the command should look like. Please kindly help. I was trying: grep "error" log.txt | wc -l (1 Reply)
Is there an efficient awk that can count the number of lines that occur in between two tags.
For instance, consider the following text:
<s>
Hi PP -
my VBD -
name DT -
is NN -
. SENT .
</s>
<s>
Her PP -
name VBD -
is DT -
the NN -
same WRT -
. SENT -
</s>
I am interested to know... (4 Replies)
Discussion started by: owwow14
4 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)