Using touch to create a file Post: 302896683

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Can I make "touch" create executable files by manipulating umask?

I'm getting to grips with this concept of the umask. What I thought was, setting umask uga+rwx would result in creating files with all permissions for everyone. Seems not to be the case though. Read and write bits get set, but not the execute bit. Is there some gap in my understanding, or is...

2. UNIX for Dummies Questions & Answers

Touch all files and subdirectories (recursive touch)

I have a folder with many subdirectories and i need to set the modified date to today for everything in it. Please help, thanks! I tried something i found online, find . -print0 | xargs -r0 touch but I got the error: xargs: illegal option -- r

3. Shell Programming and Scripting

Touch New File with First Line

I am interested in creating a new file from a KSH script where the first line is printed. I know how to create the file, but creating with a pre-defined first line is what I need help with. My code below creates the file, but how do I accomplish that and do it so that when I open that txt file...

4. Shell Programming and Scripting

SCP and then touch .done file

All, I am looking to make a script and wanted to see if anyone could help out. The script will go through the directory, put a timestamp, transfer it and then create a touch $file.done script HEre is my initial idea, but I don't think it will work properly. Anyone able to help me refine it...

5. Shell Programming and Scripting

Aging file not use and touch

Hi all, Need advice from expect, below is my scripts to find the file not use and touch in storage and other directory. This scripts divide by: 1. 30 days 2. 90 days 3. 180 days 4. 1 years 5. 3 years 6. 5 years Then count total size in GB from 6 each category. Sample my...

6. Shell Programming and Scripting

Needed touch command to create a file in the following format

needed touch command to create a file in the following format touch a_yyyymmdd_hhmmss

7. UNIX for Dummies Questions & Answers

Protect a file against touch

Afternoon, the stat command is used against a file to ascertain date created and last modification time. However a different individual if they so chose could use the touch command to alter the date created or modification time. Is there anyway to protect against this ? thanks Steve

8. Shell Programming and Scripting

Create a trigger file using touch

Hi, I need to create a trigger file named "start" at 4 pm daily . Once this file is created , another process would be initiated. How do i do it using touch command in unix ? My script that should have touch command shall be present in a dir /app/user/script while the trigger file should be...

9. Shell Programming and Scripting

Command / Script to create touch file in destination server

Hello Team, Is there any Linux command / script available so that, I could create a simple 0 byte file in destination server by issuing the command from source server. If yes, Could you please let me know the possible solutions. in other words I just want to create a touch file in my home...

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)