How to check that passed parameters all have the same extension?
My brain has given up; what's the simplest shell script needed to produce the above output, i.e. iterate through positional parameters, comparing their file extensions for similarity?
I know it's wrong, but here's my thought process:
Thanks in advance...
---------- Post updated at 01:21 PM ---------- Previous update was at 12:00 PM ----------
Nearly there! Now I just need it to work when files are without an extension, too (currently this would say they are NOT alike):
---------- Post updated at 01:50 PM ---------- Previous update was at 01:21 PM ----------
How do I check if the argument passed to a script is an integer?
I am writting a script that will take to integers and want to be able to check before I go on.
I am using bourne shell.
Thanks in advance (13 Replies)
Hi,
I have a unix script which can accept n number of parameters .
I can get the parameter count using the following command and assign it to a variable
file_count=$#
Is there a similar command through which i can assign a variable all the values that i have passed as a parameter
... (2 Replies)
we want to produce a script that we can pass parameters of -a for email address and -s for subject then the report filename, so an exmaple would be;
email_report -a sendto@domain.com -s This is a test reportname.txt
The problem we have is the subject can have more than one word, so I can't just... (2 Replies)
hi all,
i have a ksh script that takes up to 3 parameters -- only 2 of which are required. what's the simplest way to check if the user passed 2 or 3 parameters?
if 3 parameters are not null then
do this
elif 2 parameters are not null then
do this
else
echo "you need at least 2... (5 Replies)
Hi, I am trying to do this thing useing my shell bash ( sorry for my english )
I have in a file 63 hostnames, i wanna ask to the DHCP admin, to reserv that reserves 63 IP addresses of this hosts, using their mac address.
I have thinked this script:
for ((i=1;i<63;i++)); do
arp $(head... (10 Replies)
#!/bin/bash
function check_num_args()
{
if ; then
echo "Please provide a file name"
else
treat_as_file $*
fi
}
function treat_as_file()
{
numFiles=$#
for((i=1;i<=$numFiles;i++));do
echo $i
... (3 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)