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1. Shell Programming and Scripting
Hi,
when I try to redirect input and the command is described as a string within an array redirection does not work. why?
#!/bin/bash
dir=("tail < ./hello.txt")
tail < ./hello.txt #works
${dir} #does not work (2 Replies)
Discussion started by: heinzel
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2. Shell Programming and Scripting
I have the following while loop that I put in a script, demo.sh:
while read rna; do
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3. Shell Programming and Scripting
Hello
I would like to write a bash shell script which will need user to supply one variable which is mandatory and some other optional variables. If mandatory variable is not supplied by user, the script will exit. If optional values are not supplied by user, hard-coded value (in the script)... (3 Replies)
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4. UNIX for Dummies Questions & Answers
Hi Sir,
I am just learning bash scripting and I came across a challenge.
I need to input F11 to a script among many text inputs.
For all the text inputs i did following.
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where input.txt contains all the text inputs in new lines.
This worked fine until i... (1 Reply)
Discussion started by: gaurav kumar
1 Replies
5. Shell Programming and Scripting
Hello,
I'm trying to figure out how best to approach this script, and I have very little experience, so I could use all the help I can get. :wall:
I regularly need to delete files from many directories.
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6. Shell Programming and Scripting
I would create a bash script than parse like this:
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understand???
I hope...
thanks (6 Replies)
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7. Shell Programming and Scripting
Hi,
I have this script
Script.sh:
#!/bin/sh
sed 's,\,,g' input.dat > output .dat
But i want to run it witb different files. So i want the input file as an input argument to the script, how could i do that.
Running it like this:
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8. UNIX for Dummies Questions & Answers
1) I wrote a script and gave the desired permissions using "chmod 755 scriptname". Now if i edit the script file, why do i need to set the permission again? Didn't i set the permission attribute.. or if i edit the file, does the inode number of file changes?
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9. Shell Programming and Scripting
Hi all,
I'm trying to get a bash script working for a program (bowtie) which takes a list of input files (*.fastq) and assembles them to an output file (outfile.sam). All the .fastq files are in one folder in my home directory (~/infiles).
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10. Shell Programming and Scripting
All,
I am trying to figure out a script to run in windows that will allow me to match on First column in file1 to 8th Column in File2 then
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File1:
12345 Sam
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File2:... (1 Reply)
Discussion started by: darkoth
1 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)