04-19-2015
In addition to what RudiC said, variables which contain spaces or special chars should be within quotes.
10 More Discussions You Might Find Interesting
1. Programming
Hi all,
I have a file like this
ibhib=ere
wefwfl=werfe
sfdes=wef
From this file, i need to get the lefthand side string with respect to the corresponding righthand side string. i.e, I need to get the string "ere" with respect to "ibhib".
But i am stuck with how to compare a string... (1 Reply)
Discussion started by: abey
1 Replies
2. Shell Programming and Scripting
The script will read a bunch of names, and test if it contains "John", but as below apparently ~ does not work, so what is the easiest way to perform string comparison in bash shell script? thanks
...
elif
then
echo "get John"
.... (2 Replies)
Discussion started by: fedora
2 Replies
3. Shell Programming and Scripting
Hello experts,
(tcsh shell)
Quite new to shell scripting...
I have got a file with a single word on each line. Want to be able to make a comparison such that i can read pairs of words that are ROT13 to each other. Also, i would like to print the pairs to another file.
Any help... (5 Replies)
Discussion started by: Jatsui
5 Replies
4. UNIX for Dummies Questions & Answers
Hi Guys
i need to write a script to check the file structure
I have added the the file headers in the configuration file and execute the file at the start of the script.
Now the function
checkFileStructure()
{
echo "Inside the function"
filetocheck=$1
fileheader=$2
if ]
then... (1 Reply)
Discussion started by: Swapna173
1 Replies
5. Shell Programming and Scripting
I'm running the following script to compare string values to a regexp:
for entry in $(lpinfo -v | cut -c 1-); do
if
then
echo "blah"
continue
fi
done
Whenever I run it, each token of lpinfo is being interpreted as a command and I get errors such as:
... (2 Replies)
Discussion started by: hypnotic_meat
2 Replies
6. UNIX and Linux Applications
Hi ,
My requirement is to read from a file into a variable.
I need to check if the variable is equal to string "no rows selected".
The sh script snippet is as follows:
file=/data/lpgtwo/home/nikhilp/TriggerNames.txt
echo $file
var=`cat $file`
echo $var
if
then
echo "No... (3 Replies)
Discussion started by: MNG
3 Replies
7. Shell Programming and Scripting
#!/bin/sh
PRINTF=/usr/bin/printf
MACHINE_NAME=`uname -n`
TIME=`date +"%H"`
$PRINTF "Welcome to $MACHINE_NAME. What is your name?\n"
read NAME
if ; then
$PRINTF "Good morning $NAME, how are you?\n"
elif ; then
$PRINTF "Good afternoon $NAME, how are you?\n"
else
$PRINTF "Good... (2 Replies)
Discussion started by: ikeQ
2 Replies
8. Shell Programming and Scripting
continuing from my previous post, whose link is given below as a reference
https://www.unix.com/shell-programming-scripting/171076-shell-scripting.html#post302573569
consider there is create table commands in a file for eg:
CREATE TABLE `Blahblahblah` (
`id` int(11) NOT NULL... (2 Replies)
Discussion started by: vivek d r
2 Replies
9. Homework & Coursework Questions
attempting the hangman program. This was an optional assignment from the professor. I have completed the logical coding, debugging now.
##I have an array $wordString that initializes to a string of dashes
##reflecting the number of letters in $theWord
##every time the user enters a (valid)... (5 Replies)
Discussion started by: lotsofideas
5 Replies
10. Shell Programming and Scripting
I have the logic below to look up for matches within the columns between the two files with awk.
In the if statement is where the string comparison is attempted with ==
The issue seems to be with the operands, as
1. when " '${SECTOR}' " -- double quote followed by single quote -- awk matches... (1 Reply)
Discussion started by: deadyetagain
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)