Replacing in huge text file

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Filter records in a huge text file from a filter text file

Hi Folks, I have a text file with lots of rows with duplicates in the first column, i want to filter out records based on filter columns in a different filter text file. bash scripting is what i need. Data.txt Name OrderID Quantity Sam 123 300 Jay 342 498 Kev 78 2500 Sam 420 50 Vic 10...

2. Shell Programming and Scripting

Output only first 400 bytes of a huge text file

How do I output only the first 400 bytes of a huge text file to a new file. It has to be unmodified so no added invisible characters. Many thanks.....

3. Shell Programming and Scripting

How to open a huge text file?

Hi. I have a 10 Gb text file.the default text editor in ubuntu doens't open it. Does anyone know how can i open it?? Thanks

4. UNIX for Dummies Questions & Answers

Replacing a column in a text file

Say I had a text file that contained four columns, like the following: Mack Christopher:237 Avondale Blvd:970-791-6419:S Ben Macdonor:30 Dragon Rd:647-288-6395:B I'm making a loop that will replace the fourth column a line in the file with the contents of a variable 'access', but I have no...

5. Shell Programming and Scripting

Replacing second line from huge files

I'm trying simple functionality of replacing the second line of files with some other string. Problem is these files are huge and there are too many files to process. Could anyone please suggest me a way to replace the second line of all files with another text in a fastest possible manner. ...

6. UNIX for Dummies Questions & Answers

Help parsing and replacing text with file name

Hi everyone, I'm having trouble figuring this one out. I have ~100 *.fa files with multiple lines of fasta sequences like this: file1.fa >xyzsequence atcatgcacac...... ataccgagagg..... atataccagag..... >abcsequence atgagatatat..... acacacggd..... atcgaacac.... agttccagat.... The...

7. Shell Programming and Scripting

replacing text with contents from another file

I'm trying to change the ramfs size in kernel .config automatically. I have a ramfs_size file generated with du -s cat ramfs_size 64512 I want to replace the linux .config's ramdisk size with the above value CONFIG_BLK_DEV_RAM_SIZE=73728 Right now I'm doing something dumb like: ...

8. Shell Programming and Scripting

replacing text in a file, but...

Hi all, Very first post on this forums, hope you can help me with this scripting task. I have a big text file with over 3000 lines, some of those lines contain some text that I need to replace, lets say for simplicity the text to be replaced in those lines is "aaa" and I need it to replace it...

9. Shell Programming and Scripting

Replacing Text in Text file

Hi Guys, I am needing some help writing a shell script to replace the following in a text file /opt/was/apps/was61 with some other path eg /usr/blan/blah/blah. I know that i can do it using sed or perl but just having difficulty writing the escape characters for it All Help...

10. UNIX for Dummies Questions & Answers

How to remove FIRST Line of huge text file on Solaris

i need help..!!!! i have one big text file estimate data file size 50 - 100GB with 70 Mega Rows. on OS SUN Solaris version 8 How i can remove first line of the text file. Please suggest me for solutions. Thank you very much in advance:)

LEARN ABOUT DEBIAN

bup-margin

bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME

       bup-margin - figure out your deduplication safety margin

SYNOPSIS

       bup margin [options...]

DESCRIPTION

       bup margin  iterates  through  all  objects  in	your  bup repository, calculating the largest number of prefix bits shared between any two
       entries.  This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.

       For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45.  That  means  a  46-bit
       hash  would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
       its first 46 bits.

       The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects.  Since SHA-1 hashes have 160 bits,
       that  leaves 115 bits of margin.  Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
       with far fewer objects.

       If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see	if
       you're getting dangerously close to 160 bits.

OPTIONS

       --predict
	      Guess  the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
	      from the guess.  This is potentially useful for tuning an interpolation search algorithm.

       --ignore-midx
	      don't use .midx files, use only .idx files.  This is only really useful when used with --predict.

EXAMPLE

	      $ bup margin
	      Reading indexes: 100.00% (1612581/1612581), done.
	      40
	      40 matching prefix bits
	      1.94 bits per doubling
	      120 bits (61.86 doublings) remaining
	      4.19338e+18 times larger is possible

	      Everyone on earth could have 625878182 data sets
	      like yours, all in one repository, and we would
	      expect 1 object collision.

	      $ bup margin --predict
	      PackIdxList: using 1 index.
	      Reading indexes: 100.00% (1612581/1612581), done.
	      915 of 1612581 (0.057%)

SEE ALSO

       bup-midx(1), bup-save(1)

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-margin(1)

Shell Programming and Scripting