10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hey,
can someone explain me this script?
i=0
while read WORT
do
echo $WORT|grep a>/dev/null || echo$WORT|grep B>dev/null || let i=$i+1
done
echo $i
The first lane initializie the variable i with the value of 0.
The loop line has 3 different options because of ||. The only option I... (10 Replies)
Discussion started by: newuser21
10 Replies
2. Shell Programming and Scripting
Hi
My friend wrote this particular script and won't tell me what it does, and when I run it I don't understand it.
What does the entire script do with specifics please.
Thanks
Bob
#!/bin/bash
current=0
while ; do
if ; then
echo ${current}
current=$((${current}+1))
fi
done (1 Reply)
Discussion started by: shadowknight777
1 Replies
3. Shell Programming and Scripting
To merge mutiple *.tab files as:
file1.tab
rs1 A A
rs2 A A
rs3 C C
rs4 C Cfile2.ind
rs1 T T
rs2 T T
rs3 G G
rs4 G Gand file3.tab
rs1 B B
rs2 B B
rs3 L L
rs4 L LOutput:
file1.tab file2.tab file3.tab
AA TT BB
AA TT BB
CC GG LL
CC GG ... (4 Replies)
Discussion started by: yifangt
4 Replies
4. Solaris
Hello Guys,
can someone help explain the script below for me? I will really appreciate it.
vi db_script
#!/bin/sh
echo .cron job run on.`date`> cronjob.txt
df -h >> cronjob.txt
echo welcome to home (2 Replies)
Discussion started by: cjashu
2 Replies
5. Shell Programming and Scripting
The following script will create a directory in a directory and will go on as many times as the number you will give in.
I am trying to find out how it works ... can someone please help me with that?
#!/bin/sh
#create a variable and set it to 1
n=1
#start a loop as... (3 Replies)
Discussion started by: I-1
3 Replies
6. Shell Programming and Scripting
#script
fileused=test.txt
hostname=test.dis.com
ftp $hostname <<-! > $fileused.err 2>&1
put file.txt /usr/text.txt
bye
!
kindly the above script the one marked as Bold and underlined as the above i am declaring the new variable as filename ,But when i used i had used as $fileused.err... (1 Reply)
Discussion started by: rajar_r
1 Replies
7. Shell Programming and Scripting
Hello,
I have seen this script on this site. I understand most of it. However I am a bit stuck on the part in red. It appears to be expanding
for file in *.zip
do
zipdir=${file%.*}
mkdir $zipdir || echo "unable to create $zipdir"
cp $file $zipdir || echo "unable to copy $file"... (3 Replies)
Discussion started by: jaysunn
3 Replies
8. Shell Programming and Scripting
Hi
All,
Can anybody explain what this script is doing?
#!/bin/sh
who | cut -d " " -f1 | sort -u > userlist1
while true ; do
sleep 60
who | cut -d" " -f1 | sort -u >userlist2
for username in `cat userlist1` ; do
if ! grep "^$username$" userlist2 > /dev/null ; then
echo... (0 Replies)
Discussion started by: vishalpatel03
0 Replies
9. Shell Programming and Scripting
I have a script that has defined a log file like this.
The name of the script is verify.sh
Inside the script there is some thing like this.
LOG=/usr/verify
TDATE=`date "+%m%d%y"$$`
LOGFILE=$LOG.$TDATE.
and inside the script it has been written as
echo "This is to verify" | tee -a... (2 Replies)
Discussion started by: sendhilmani
2 Replies
10. Shell Programming and Scripting
I have the following script
awk '$1 ~ /^*+/ {
s += $NF;
m++
}
END {
print NR, m, s
}
and I use it to get results from the following file
A4792 4
COMP9021 5
K9 7
ABC 8
924 1
R2D2 3 (8 Replies)
Discussion started by: sickboy
8 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)