12-26-2016
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I use read often in scripts to filter the right part into a variable like:
$ print "abc cde efg" | read k l ; print "k=$k, l=$l"
k=, l=
This works on linux and unix versions I work with. On OSX 10.4 this
doesn't work. I found a workaround but would like to know
why the original line... (5 Replies)
Discussion started by: relyveld
5 Replies
2. Shell Programming and Scripting
Hi, I'm doing a script that reads lines from a file and then copy them to another file, if the user wants it.
But I'having problems to get the user selection because when I do the read to ask the user, the script reads the next line of the file.
The script looks like this:
#!/bin/sh
# ... (2 Replies)
Discussion started by: pmpx
2 Replies
3. Shell Programming and Scripting
I've discovered a very annoying problem in sh:
echo -en "one\ntwo\nthree" | while read VALUE
do
echo "${VALUE}"
done This will print one and two, but not three. The last line is IGNORED because it lacks a newline. This makes it hard to use sh for things like CGI scripting; you have... (6 Replies)
Discussion started by: Corona688
6 Replies
4. Programming
Hi,
Can any one please help me with this. Am struggling hard to get a solution.
I am doing telnet through a C program and getting the stdout file descriptor of the remote machine to pipe.
read() function is getting data, But whenl it receives SOH character ie. ^A ( Start of heading = Console... (2 Replies)
Discussion started by: JDS
2 Replies
5. Shell Programming and Scripting
Hello,
I have this simple script
while read name
do
ssh $name "hostname > /tmp/$name.txt"
ssh $name "/opt/ignite/bin/print_manifest | grep Main >> /tmp/$name.txt"
ssh $name "getconf MACHINE_SERIAL >> /tmp/$name.txt"
ssh $name "ioscan -kfnC processor | grep processor | wc -l >>... (3 Replies)
Discussion started by: Andyp2704
3 Replies
6. Shell Programming and Scripting
Hi Guys,
I am just trying to read data from a file.
The command i tried worked well with AIX server. But in SunOS, it is not reading.
cat log.out |sed -n '4,4p'| read value;
+ sed -n 4,4p
+ cat log.out
+ read value
echo $value;
+ echo
This is the log of running the script.
... (13 Replies)
Discussion started by: mac4rfree
13 Replies
7. Shell Programming and Scripting
Dear all,
I have this archive: cat file.txt
archive test 02 sequence 03 02length 52
archive test 02 sequence 04 02length 52
archive test 02 sequence 05 02length 52
teste arquivo 06 sequencia 08 06 length 54
teste arquivo 06 sequencia 09 ... (8 Replies)
Discussion started by: cewa67
8 Replies
8. Shell Programming and Scripting
Hi everybody, I am new to shell script. Please help me with this problem.
I have a file test.txt with the content like this:
I have a shell script test.sh like this
#!/bin/sh
while read line
do
echo $line >> out.txt
done < test.txt
out.txt is expected to have the same content... (10 Replies)
Discussion started by: Dark2Bright
10 Replies
9. Shell Programming and Scripting
Hi - I don't understand why the following script isn't working. I want to read the contents of a while loop into an array, but it looks like the array is destroyed once the while loop is finished. Can anybody help?
someFile:
PC_1 wf_test1 Test
PC_2 wf_test2 Test
PC_3 wf_test3 Test
Script:... (3 Replies)
Discussion started by: lt1776
3 Replies
10. Programming
I am trying to make a server and client, the client will choose between some options and the server will react accordingly.
After a some reads and writes that work the server needs to read from client an INT i use this:
read(newSd,&k,sizeof(int));But even if all the other times there was no... (1 Reply)
Discussion started by: theSling
1 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)