Try
It will check in both directories for .log files and evaluate to true if a file exists in either.
Note that if either of those directories are empty, or at least do not contain any files with names ending in .log, the command substitution will print a diagnostic message. You can avoid having those appear on the screen when you run this script by throwing away any diagnostics produced by ls:
This User Gave Thanks to Don Cragun For This Post:
conditional is not wworking
can any one figure out what goes wrong
xx1=`$ORACLE_HOME/bin/sqlplus -s apps/ostgapps1 2>/dev/null << EOF
WHENEVER SQLERROR EXIT 1
set head off feedback off ;
WHENEVER SQLERROR EXIT SQL.SQLCODE;
select count(*) from CMS_INVOICE_ALL... (2 Replies)
Hi,
I am new to unix and shell scripting.In my script,there is a line using the "if" conditional -
if && ; then
do something
Here "x" is a variable holding string value.If it is not equal to a comma or a string,only then I want to enter the "if" loop. But I am getting error while... (1 Reply)
Hi,
I am new to unix and shell scripting.In my script,there is a line using the "if" conditional -
if && ; then
do something
Here "x" is a variable holding string value.If it is not equal to a comma or a string,only then I want to enter the "if" loop. But I am getting error while... (12 Replies)
Hi,
I need to extract lines based on some conditions as explained below:
File format details:
1. each set starts with AAA only
2. number of columns is fixed
3. number of rows per set may vary (as one set is upto DDD - 4 rows)
Now, i need to extract only the lines starting with AAA and... (2 Replies)
I need a shell script that will monitor a few conditions and not execute until the these conditions are met. The problem I'm having is that I can not perform a database snapshot (backup) of a sybaseIQ database unless the CPU Status Idle % is above 60% or the snapshot (backup) fails.
If... (2 Replies)
I want to add a conditional statement to a user's .profile file. I have a certain number of users that log in and use the rksh (Restricted Korn Shell). When they log in, it starts a certain program and when they exit this program, the system logs them out. When they are in this program, they can... (2 Replies)
Hi,
I want to perform a conditional search and remove my search string.
Input string: "abcdaabcadgfaarstab"
Character to search: "a"
Condition: Remove all "a" in the input string except if it is "aa"
Output string: "bcdaabcdgfaarstb"
Can you please help me in this? (5 Replies)
Hi,
I have one array created and some values are there in ksh. I want to append some other values to it based on some condition in if statement.
#!/bin/ksh
echo "---------------------------------------------------"
set -A ipaddr_arr $(egrep -v '^#|^::|^$' /etc/hosts |awk '{print $1}'... (2 Replies)
Greetings,
I need help in splitting the files in an efficient way while accommodating the below requirements . I am on AIX.
Split condition
Split the file based on the record type and the position of the data pattern that appears on the on the record type.
Both record type and and the... (9 Replies)
Hi everyone,
I need to replace values of column 2 array1 with values of column 2 array2 based on a lookup of column 4 value, but only return a value IF the values in column 1 of BOTH array1 and array2 match, otherwise keep original value in column 2 of array1. Both files are tab delimited... (2 Replies)
Discussion started by: Geneanalyst
2 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)