01-27-2013
Many thanks for the explanation.
The size of the pattern file has increased but awk seems to respond pretty well. To speed up the process, I converted all Unicode to 8 bit and got a fair amount of speed in computation.
Thanks a lot.
---------- Post updated at 11:45 PM ---------- Previous update was at 11:13 AM ----------
Sorry to hassle again. I got the logic, but I have two queries:
A simple one:suppose I wanted to print all the data found on one line instead of on separate lines, what would I have to tweak ? I tried tweaking the print command but could not get the script to print all words on one line.
More complex. My pattern file has gone huge. I am testing 4 letter combos which means around 64000 strings to match. When I run the file against around a similar size of inputs, the script executes but does not give the expected result.
Any solutions. I am quite desperate to solve this issue. Many thanks in advance but with my limited knowledge of AWK and the reading I am doing from OReilley's book on sed and awk, things do not seem to work out.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi
I have 3 patterns for example to be searched.
These three patterns are available in file1.
The patterns to be searched are in file2.
I want to search the pattern of file1 to file2.
Can any one help with example?
Regards
Dhana (1 Reply)
Discussion started by: dhanamurthy
1 Replies
2. Shell Programming and Scripting
Hi,
From the pattern mentioned below remove lines based on pattern range.
Conditions
1 Look For all lines starting with ALTER TABLE and Ending with ; and contains the word MOVE.I wanto to remove these lines from the file sample below.
Note : The above pattern list could be found in... (1 Reply)
Discussion started by: rajan_san
1 Replies
3. Shell Programming and Scripting
Good day, great gurus,
I'm new to Perl, and programming in general. I'm trying to retrieve a column of data from my text file which spans a non-specific number of lines. So I did a regexp that will pick out the columns. However,my pattern would vary. I tried using a foreach loop unsuccessfully.... (2 Replies)
Discussion started by: Sp3ck
2 Replies
4. Shell Programming and Scripting
Hi Gurus,
I have a file say for ex. file1 which has 3500 lines in it which are different account numbers and another file (file2) which has 230000 lines in it. I want to read all the lines in file1 and delete all those lines from file2 which has that same pattern as in file1. I am not quite... (4 Replies)
Discussion started by: toms
4 Replies
5. Shell Programming and Scripting
Hi All, I need to grep few files which has words like the below in the file name , which i want to put it in a file and and grep for the files which contain these names and move it to a new directory ,
full file name -C20091210.1000-20091210.1100_SMGBSC3:1000... (2 Replies)
Discussion started by: anita07
2 Replies
6. Shell Programming and Scripting
Hi, I want to list all file that match user input ( specified shell wildcard) but when I compile it dont list me
#!/usr/bin/perl -w
print "Enter Advance Search Function: ";
chomp ($func = <STDIN>);
my @files = glob("$func");
foreach my $file (@files)
{
print "$file\n";... (1 Reply)
Discussion started by: guidely
1 Replies
7. Shell Programming and Scripting
I have two files: usednaslist & naslist
Using RHEL5
usednaslist
>filera:/vol/EQIMS/build
>filera:/vol/iquad_dev/FAST_dev
naslist
>server12 SunOS filera:/vol/EQIMS/build /users/uxsrvlogs
>servers3 SunOS filera:/vol/iquad_dev/FAST_dev /mnt
>server4 SunOS ... (2 Replies)
Discussion started by: nitrobass24
2 Replies
8. UNIX for Beginners Questions & Answers
How do I use grep to select words that start with I or O, end in box, and contain at least one letter in between them?
the text file mailinfo.txt contains
Inbox
the Inbox
Is a match box
Doesn't match
INBOX
Outbox
Outbox1
InbOX
Ibox
I box
If the command works correctly it... (4 Replies)
Discussion started by: steezuschrist96
4 Replies
9. UNIX for Beginners Questions & Answers
When I use the following grep command with options -F and -f, its just displaying the text related to only the last pattern.
Command: $ grep -f pattern_file.txt input_file.txt
Output: doc-C2-16354
Even the following command yields the same output:
Command: $ grep -Ff pattern_file.txt... (6 Replies)
Discussion started by: nsai
6 Replies
10. UNIX for Beginners Questions & Answers
I am able to grep multiple patterns which stored in a files. However, how could we replace the whole line with either the pattern or new string?
For example:
pattern_file: *Info in the () is not part of the pattern file. They are the intended name to replace the whole line after the pattern... (5 Replies)
Discussion started by: wxboo
5 Replies
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)