06-15-2017
Thanks for the friendly welcome Don. I haven't had any homework assignments for over 25 years. I'm a hobbyist working on a maths problem. I wrote a little C program to generate this data, and want to sort through it with shell tools as an intermediate step to solving the problem empirically (as a hint to myself, before I try to solve it mathematically). I am using Bash by default, since it is the default shell on my laptop running OS 10.6, but other shells are available. What I have done so far: stared at it and realised I don't know how to do this kind of multi-line search with the handful of shell commands I have taught myself over the last 30 years (and only used very infrequently, when such problems come up). I suppose I could also have tried to do this weeding out within my C program, but I can't see how to do it without having to hold everything in memory all at once (again, I write such programs very infrequently). So, it seems better to write it to a file then use some other tool in the shell to search that file. Hence my posting here. I'm sure there is a better way, but I break out my C and shell scripts about once every 6 months and at my age it's often easier to ask.
Is there anyone less suspicious who might be able to point me in a useful direction?
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
i have a file a.txt and following is only one portion.
I want to search <branch value="/dev36/AREA/" include="yes"></branch> present in between
<template_file name="Approve External" path="core/approve/bin" and </template_file>
where the no of lines containing "<branch value= " is increasing ... (2 Replies)
Discussion started by: millan
2 Replies
2. Shell Programming and Scripting
My sql file xyz_abc.sql in this file there are multiple sql block in this block I need to find the following block
rem Subset Rows (&&tempName.*)
CREATE VIEW &&tempName.* AS
SELECT *
FROM &&tempName.*
WHERE f is not null
and replace with following code
rem Subset Rows... (9 Replies)
Discussion started by: Zaheer.mic
9 Replies
3. Shell Programming and Scripting
Hi,
I would like to know how to solve one of my problems using expert unix commands.
I have a file with occasional blank lines;
for example;
dertu
frthu
fghtu
frtty
frtgy
frgtui
frgtu
ghrye
frhutp
frjuf
I need to edit the file so that the file looks like this; (10 Replies)
Discussion started by: Lucky Ali
10 Replies
4. UNIX for Dummies Questions & Answers
Hello all, new to unix and have just found the forum.
I think I will be here quite often, and hope that in time i will be able to provide soem help, role on not being a newbie anymore :)
I have a question which iI am hoping someone could help me with.
If i have a file with lines in in thus... (8 Replies)
Discussion started by: grom
8 Replies
5. Shell Programming and Scripting
i have a file containing over 1 million records,and i want to print about 300,000 line containing a some specific words.
file has content.
eg
1,rrt,234
3,fgt,678
4,crf,456
5,cde,drt
6,cfg,123
and i want to print the line with the word fgt,crf
this is just an example,my file is so... (2 Replies)
Discussion started by: tomjones
2 Replies
6. UNIX for Dummies Questions & Answers
Hi Experts,
I have a file which contains some text. i need to print the word next to a given keyword. Please help.
Ex: test.txt
=====================
NEXT HOST
=====================
AEADBAS001
access-list 1 permit xxxxxxxxxxxxxx
ip access-list extended BLA_Outgoing_Filter... (6 Replies)
Discussion started by: mwrg
6 Replies
7. Shell Programming and Scripting
i need to get least lines of file after last word TEST in file, and send that lines to mail
example of file structure:
TEST 10.10.2010
jdfjdnjfndjfndnfkdk
djfjdnfjkdjkfnjkdfk
jdfjdjfnjdjnfjkdnfjk
TEST 11.10.2010
jdjfnjdnfdkdfjdfjdnk
jdnfjdnjkfndnfjdnfjk
fjdnfjkndnfdfnjdnfjk
TEST... (6 Replies)
Discussion started by: waso
6 Replies
8. Shell Programming and Scripting
Hi All,
I want to read all lines after a perticular string {SET UP VALUES}apprears in the file.
SET UP values contains direcory, number of days and file type.
Step1: Read all lines below SET UP VALUES string.
Step2: If set up values are not present in each record then read from default... (4 Replies)
Discussion started by: Nagaraja Akkiva
4 Replies
9. UNIX for Advanced & Expert Users
Hi ,
i have a file with data as below.This is same file. But actual file contains to many rows.
i want to search for a string "Field 039 00" and delete that line and previous 3 lines in that file.. Can some body suggested me how can i do using either sed or awk command ?
Field 004... (7 Replies)
Discussion started by: vadlamudy
7 Replies
10. UNIX for Beginners Questions & Answers
Guys i need an idea for one logic..in shell scripting am struggling with a logic...So the thing is... i need to search for a word in a huge log file and i need to continue to print few more lines from that line and the consecutive line has to end when it finds the line with date..because i know... (1 Reply)
Discussion started by: Prathi
1 Replies
GREP(1) General Commands Manual GREP(1)
NAME
grep - search a file for lines containing a given pattern
SYNOPSIS
grep [-elnsv] pattern [file] ...
OPTIONS
-e -e pattern is the same as pattern
-c Print a count of lines matched
-i Ignore case
-l Print file names, no lines
-n Print line numbers
-s Status only, no printed output
-v Select lines that do not match
EXAMPLES
grep mouse file # Find lines in file containing mouse
grep [0-9] file # Print lines containing a digit
DESCRIPTION
Grep searches one or more files (by default, stdin) and selects out all the lines that match the pattern. All the regular expressions
accepted by ed and mined are allowed. In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or 1
occurrences, and | can be used between two regular expressions to mean either one of them. Parentheses can be used for grouping. If a
match is found, exit status 0 is returned. If no match is found, exit status 1 is returned. If an error is detected, exit status 2 is
returned.
SEE ALSO
cgrep(1), fgrep(1), sed(1), awk(9).
GREP(1)