In bash, I can match the ' character in a substition involving the line ending symbol $, easily.
In tcsh I ran into a problem.
Code:
sed "s/$/'/g" filename
sed "s/$/'/g" < filename
sed -e "s/$/'/g" filename
Unmatched '.
Where can I find out why this is the case? (2 Replies)
So I am new to unix, and actually anything outside drag and drop with the mouse (been learning for about a week so far) . I have been using the foreach command in tcsh because I am working on a group of files. Basically what I need is to insert part of the filename as the first line in the file.... (0 Replies)
Hi,
I need to find tcsh shell version info on several boxes.
I made a script and running on boxes through SSH.
This is what i am doing :
echo /bin/tcsh -c 'echo $version' | ssh "box name"
but i dont see anything.
if i run /bin/tcsh -c 'echo $version' on ocal machine i see the... (2 Replies)
Greetings!
I love the power and control offered by BASH but detest its syntax! Is there some alternative *nix shell language? (other than TCSH)
Or maybe a wrapper that affords the use of BASH commands via an easier syntax?
I considered creating a complicated system of aliases to... (8 Replies)
Hello,
When i run a bash script on ubuntu i get this message..
#!/bin/bash cannot find file or directory...
Can anibody help me with this, because the file actually exists....
Is there any extra configuration to be made? (5 Replies)
As I stated in a previous thread - I'm a newbie to Unix/Linux and programming. I'm trying to learn the basics on my own using a couple books and the exercises provided inside.
I've reached an exercise that has me stumped. I need to write a bash script that will will read in a file and print the... (11 Replies)
So, I made a script beginning with #!/bin/bash on gedit.
And I double clicked it to run in terminal and I end up with "The child process exited normally with status 127" and "command not found".
If I run the same script from the terminal as "tcsh (script name)" it runs just fine.
If I... (8 Replies)
As part of a bash the below line strips off a numerical prefix from directory 1 to search for in directory 2.
for file in /home/cmccabe/Desktop/comparison/missing/*.txt
do
file1=${file##*/} # Strip off directory
getprefix=${file1%%_*.txt}
... (5 Replies)
I need to find a file and print its contents
I am trying but it is not working
find -path /opt/app-root/src/.npm/_logs -type f -name "*.log" -print
Version
$ bash -version
GNU bash, version 4.4.12(1)-release (x86_64-pc-msys) (1 Reply)
Discussion started by: SVRao19056
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)
02-25-2011
