Originally Posted by Advanced Bash Scripting Guide
In my opinion, that's simply a poorly-worded comment on their part. fd 3 is closed for both. Perhaps what the author was trying to convey is that ls still has access to fd 3's destination because it was dup'd before closing (the >&3 before 3>&-). But, then, so does grep, since its inherited stdout leads to the same place as fd 3.
My advice would be to not get hung up on this example.
Here is my problem. I don't know make this redirection thing work. The output file (called output.c) looks like this
#include<stdio.h>
int main()
{
int k;
int m;
print f("%d\n", k);
printf("%d\n", m);
return 0;
}
the input file(called input.c) is this
#include<stdio.h>
int... (2 Replies)
Hi,
The code below works, it's a part of a bash shell script that serve to search a pattern $pattern_da_cercare in the files contained in a directory $directory_iniziale.
Now the proble is:
How can I redirect stderr to a file?
PS: so I want to redirect ALL the errors to a file.
I tryed... (9 Replies)
hi all,
how to redirect the stdout msg in command line and file at the same time?
e.g
i got the script named test.sh, content as following:
#!/bin/sh
echo "111"
when i run the script ./test.sh > log.log, it will wirte the "111" into log.log, but how to show the "111" in command line... (2 Replies)
Hi,
I have a Perl script that finds some files based on some criteria and then it processes the file contents using some logic.
Extract:
print "Started ... ";
my $command = "<unix command>";
@arr=`$command`;
$size=@arr;
print "Size: ".$size
If I turn on the Perl debugging option then I... (3 Replies)
Hi Guys,
I m new to UNIX and new to this forum. Was wondering if someone can help me understand redirection (standard input output pipeline etc)
for starters, not too sure what this would mean
who | sort > sortedfile | pr | lp
im starting to understand common commands but when throwing... (2 Replies)
Hello
I have a domain where i need a redirection as described below :
i.e
mydomain.com/t-ABC-048796/sample.jpg
must redirect to
mydomain.com/jjj/top/8796/sample.jpg
As you can see from the source URL (mydomain.com/t-ABC-048796/sample.jpg) i need the last four characters... (2 Replies)
I want to redirect stderr and have the following peice of code
$ cat t1.ksh
#!/bin/ksh
func2()
{
diff /tmp/jdlkwjdlkejew /tmp/djlkwejdlewdjew >$OUTPUT_FILE 2>>$ERR_FILE
}
func1()
{
let counter=0
while
do
print -u2 "Error: In main function"
func2
let... (1 Reply)
Hello All,
I am using the below script to gather various tools running by the user, we have more than 100 tools running on the server so my challenge is to redirect memory & cpu load to the file with the name of the tool.so am using the below script i am stucking how to redirect to the file... (2 Replies)
Hi
I am using solaris 10. When running a grep command with multiple files the output is the same as the order of the input. As soon as I pipe the output to another command then it seems that standard error takes precedence, over standard output and gets sent to the pipe first.
ie grep -c... (7 Replies)
explain the redirections 1>, 2>, 3>, .....
and 1< ,2<,3<.....
where we use these things
thanks
Thread moved from AIX forum (2 Replies)
Discussion started by: tsurendra
2 Replies
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)