Thank you very much! head -n100000 works like a charm.
---------- Post updated at 03:06 PM ---------- Previous update was at 09:13 AM ----------
ok new problem
i decided that i would like to preform an action between the lines 100k and 200k (for example). The easy way i tried out
Code:
head -n100 | tail -n200
did not worked and i'm guessing that tail reads the whole file first so that will be a bad idea (the file is really big). Next thing i'm thinking is using sed
something like
Code:
sed -n '100,200 p' /filelocation/file | grep "string im searching for"
but it's kinda slow when the grep is added. Any help would be greatly appricieted
hi gurus
i'm trying to get the count of number of records of a file
as : wc -l file1.txt
iam getting the correct count by in out put i'm getting the file name too
i get the output as follows "7 file1.txt"
my question is how to avoid filename in the output.
might be a basic... (20 Replies)
Hi,
Is it possible to find the total number of records processed by awk at begining.
NR gives the value at the end. Is there any variable available to find the value at the begining?
Thanks
----------
Suman (1 Reply)
Hai
I have a flat file which contains more than 6 crore lines or records. I want to delete only one line, using line number. For example I want to delete 414556 th line . How to do this using sed or awk command.
thanks (3 Replies)
Initially i store some files into anothe file Y. Now i want read the contents of file Y one by one do some check on each file.
i,e
Open file Y (contains multiple files)
First read a file , do some check on that individual file.If that file satisfies teh condition put it in another file.
Now... (1 Reply)
Hi,
I have CSV file which looks like below, i want to calulate number of records for each brand say SOLO_UNBEATABLE E and SOLO_UNBEATABLE F combined and record count is say 20 . i want to calculate for each brand, and here only first record will have all data and rest of record for the brand... (2 Replies)
Hi All,
I want to find the number of records in a file of a particular directory
I have a file as abcd.txt in the path
var/hr/payments/
I want to find number of records in abcd.txt file in a single command.
I tried the following
cd /var/hr/payments/wc -l abcd.txt
I got... (5 Replies)
I am doing a loading process. I am loading data from a Oracle source to Oracle target.
For example there is an SQL statement:
Insert into emp_1
Select * from emp_2 where deptno=20;
In this case my source is emp_2 and loading into my target table emp_1. This process is automated. Now I... (3 Replies)
I would like to print the number of records of 2 files, and divide the two numbers
awk '{print NR}' file1 > output1
awk '{print NR}' file2 > output2
paste output1 output2 > output
awl '{print $1/$2}' output > output_2
is there a faster way? (8 Replies)
How does one assign a variable, x to equal the number of records in a different file.
I have a simple command such as below:
awk -F "\t" '(NR>5) { if(($x == "0/0")) { print $0} }' a.txt > a1.txt
but I want x to equal the number of records in a different file, b.txt (10 Replies)
Discussion started by: Geneanalyst
10 Replies
LEARN ABOUT SUSE
head
HEAD(1P) POSIX Programmer's Manual HEAD(1P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME
head - copy the first part of files
SYNOPSIS
head [-n number][file...]
DESCRIPTION
The head utility shall copy its input files to the standard output, ending the output for each file at a designated point.
Copying shall end at the point in each input file indicated by the -n number option. The option-argument number shall be counted in units
of lines.
OPTIONS
The head utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.
The following option shall be supported:
-n number
The first number lines of each input file shall be copied to standard output. The application shall ensure that the number option-
argument is a positive decimal integer.
When a file contains less than number lines, it shall be copied to standard output in its entirety. This shall not be an error.
If no options are specified, head shall act as if -n 10 had been specified.
OPERANDS
The following operand shall be supported:
file A pathname of an input file. If no file operands are specified, the standard input shall be used.
STDIN
The standard input shall be used only if no file operands are specified. See the INPUT FILES section.
INPUT FILES
Input files shall be text files, but the line length is not restricted to {LINE_MAX} bytes.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of head:
LANG Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
IEEE Std 1003.1-2001, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to
determine the values of locale categories.)
LC_ALL If set to a non-empty string value, override the values of all the other internationalization variables.
LC_CTYPE
Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to
multi-byte characters in arguments and input files).
LC_MESSAGES
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
NLSPATH
Determine the location of message catalogs for the processing of LC_MESSAGES .
ASYNCHRONOUS EVENTS
Default.
STDOUT
The standard output shall contain designated portions of the input files.
If multiple file operands are specified, head shall precede the output for each with the header:
"
==> %s <==
", <pathname>
except that the first header written shall not include the initial <newline>.
STDERR
The standard error shall be used only for diagnostic messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values shall be returned:
0 Successful completion.
>0 An error occurred.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
The obsolescent - number form is withdrawn in this version. Applications should use the -n number option.
EXAMPLES
To write the first ten lines of all files (except those with a leading period) in the directory:
head *
RATIONALE
Although it is possible to simulate head with sed 10q for a single file, the standard developers decided that the popularity of head on
historical BSD systems warranted its inclusion alongside tail.
This standard version of head follows the Utility Syntax Guidelines. The -n option was added to this new interface so that head and tail
would be more logically related.
There is no -c option (as there is in tail) because it is not historical practice and because other utilities in this volume of
IEEE Std 1003.1-2001 provide similar functionality.
FUTURE DIRECTIONS
None.
SEE ALSO
sed, tail
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE /The Open Group 2003 HEAD(1P)
08-24-2012
