10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I want to check file size in unix, based on file size I am going to execute appropriate command.
I tried below, but getting the error.
System details –
Machine hardware: sun4u
OS version: 5.9
if ( -s $f1 ) then
echo "filename exists and is > 0 bytes"
else
echo "filename... (7 Replies)
Discussion started by: rahulbahulekar
7 Replies
2. AIX
Hi,
Just wondered what command you would use to list all the files on Aix by filesize?
I've tried a few but none of which seem to do the trick!
Currently running du -m -a . | sort -rn | more as root
Thanks,
Matt. (1 Reply)
Discussion started by: elmesy
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3. Solaris
How do I check for any file size limitations in a directories ?
I remember my administrator had set a file limitation for a certain directory. I would like to know how I can check that. Thank you. (2 Replies)
Discussion started by: Leion
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4. Shell Programming and Scripting
Hello,
I have a script that should store file size in a variable $filesize.
I don't know what is the best way to do it.
I tried
ls -lt myfile.txt | sed something >$filesize
but I don't know how to use sed to get filesize. I know that the owner of the file is root and then we have some... (6 Replies)
Discussion started by: pppswing
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5. Shell Programming and Scripting
I want to know if there is any unix command to view the size of the file?
eg.
i have a directory letter
in this i have file a,b,c,d,e.
i just want to know the size of file d and not any other. (3 Replies)
Discussion started by: infyanurag
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6. UNIX for Dummies Questions & Answers
Hey guys.
What I need to do is this:
I need to find files that have a certain filesize (for this case a file size of 0 (zero) )
When I find this file with a filesize of zero I need to echo a statement that tells the user to delete it and not to delete it if the filesize is greater than... (3 Replies)
Discussion started by: ndoggy020
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7. Shell Programming and Scripting
Hello everybody it's me again.
I have a procces that is writing in a 'file1' automatically but i want to truncate 'file1' to a filesize 'x' that mean if the 'file1' size is 'x' i want to delete the first lines while the last lines are being writed, that have sence?
in the process are an... (1 Reply)
Discussion started by: Lestat
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8. UNIX for Dummies Questions & Answers
I saw some stuff in the search results on this - but nothing specific.....
I have a significant number of files (c. 300) which are output from a large process that I run. These are compared with a 'baselined' set of files - so I can quickly see if there are differences based on the sizes of the... (2 Replies)
Discussion started by: peter.herlihy
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9. Shell Programming and Scripting
How do I identify if there is any content in a file?
If there is nothing in a specified file, I'd like to send an email indicating that there is nothing to report.
Any help appreciated. (3 Replies)
Discussion started by: Cameron
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10. Shell Programming and Scripting
I know in php if you use the function filesize it will return the size of the file in bytes, but is there an easy way to get the size in MB.
Cheers (2 Replies)
Discussion started by: jmg5
2 Replies
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)