Yes. That command is reading your file sequentially till the 177998637th line and then printing this and the next line and then quitting the read operation. So you see, to print just those 2 lines, the command still has to read the first 177.99 million lines (have to say, a huge huge file).
For an improvement in the time taken, you could replace that sed command with awk:
Last edited by elixir_sinari; 08-27-2012 at 08:00 AM..
This User Gave Thanks to elixir_sinari For This Post:
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 PLAN9
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)