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Hi Don Cragun,
I tried with all suggestions and I thank everyone including you, and as usual (which has happened in the past too!), your solution worked out ideal for me. Given that there are...

The table data has been obtained from web pages, which are very noisy. In the first table, there are two columns where the first few strings could not be obtained in both columns. This could be...

I have about a million tables stored as .txt files in a directory. The content of the files look like this:



ages-eligible-for-study:
genders-eligible-for-study:
accepts-healthy-volunteers:...

Thanks, and sorry for not being very clear in my initial post. The output that I am trying to get is:
'''Anarchism''' is a [[political-philosophy]] that advocates [[self-governance|self-governed]]...

I have a huge text file, about 52 GB. In the file, there are patterns like these:
[[Renaissance humanism|renaissance]]
[[Taoism|Taoist]]
[[Foundation for Economic Education]]...

Thanks. The output is exactly what I want, and thus it meets my requirement. The difference now is that your is a much faster way to get the output.

My input is:
a.txt computer
b.txt
c.txt
e.txt
I want my output to be:
a.txt computer
b.txt computer
c.txt computer
e.txt computer
There are about 100000 text files having the same format as...

I have written a code in C where the objective is to search for strings.

There are two files:
1. Database file which has more than one billion entries. This file is read in argv[1] in the C code...

Thanks. Yes, both of them work. It solves my problem.

I have a file (myfile.txt) with contents like this:

1.txt apple is
3.txt apple is
5.txt apple is
2.txt apple is a
7.txt apple is a
8.txt apple is a fruit
4.txt orange not a fruit
6.txt zero...

Thanks. Running the script now. I will post again about the observations.

I have one big file of size 9GB (big_file.txt). This big file has sentences and paragraphs like any usual English document. I have another file consisting of replacement strings for sed to use. The...

I just tried your code, and this is perhaps the best that I have tried so far in terms of efficiency. I am currently running multiple instances of a much slower version on my machine using GNU...

Suppose w is a word. Let us take w='receive', as used by you. My objective is to extract two words before and after 'receive'. So what I want is this:

primaries to receive the presidential

But...

Yes, I used split command to split the big_file.txt to smaller chunks of 350MB each. I then tried your command and others too on one of these smaller chunks. I noticed that your suggested case takes...

Thanks, drl. I can see some improvement using your command as I can see that all words in "obama|primaries|water" are searched at the same time. This can surely help reduce the amount of iterations...

Thanks for your responses. When I ran RudiC's script, I did not see any output for five minutes and the memory usage crossed 60%. I had to stop running it, but I thank RudiC for his script. I did not...

I have two files:
1. A huge 8 GB text file. (big_file.txt)
2. A huge list of words approximately 8 million of them. (words_file.txt). Each word is separated by a newline.

What I intend to do is...

I have a sample text file with file name: sample.txt

The text file has the following text.
this is an example text where we have to extract certain words before and after certain word these words...

It is very simple to remove a hyphen from a word anywhere in that word using a simple sed command (sed -i 's/-//g' filename), but I am not able to figure out how to do this:

For example,
apple...

I have a huge list of files (about 300,000) which have a pattern like this.

.I 1
.U
87049087
.S
Am J Emerg
.M
Allied Health Personnel/*; Electric Countershock/*;
.T
Refibrillation managed...

Yes, in my case the first column contains only 0 and 1. However, it is good to see others generalize to other values.

I have a file which looks like this:

1 3 5 5 3 2
1 5 3 6 3 2
0 5 6 3 2 9
0 4 5 6 4 9

In the first column, instead of 1, I want to place +1 and instead of 0, I want -1 to be put. So the...

I have a file which has all integer numbers like this. This file is sort of very large, and I am only showing the first few contents. This representation can be regarded as a matrix of integer...

I know how to search for a pattern/regular expression in many files that I have in a directory. For example, by doing this:
grep -Ril "News/U.S." .
I can find which files contain the pattern...