09-01-2012
Just an observation:
much of the confusion is caused by using "i" or "j" instead of meaningful variable names. If a variable is an index to a filename, then call it "FileNameIdx" or something such, instead of "i". Once you accumulate several "i"s, "j"s and "k"s you sure will not know any more which counts what.
Do yourself a favour and don't save on the few keystrokes. You will save in the long run with less debugging effort what you invest up front in clarity.
I hope this helps.
bakunin
This User Gave Thanks to bakunin For This Post:
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
May i know how to pass an argument to a function in a shell script?
Sorry, i din stated that it is in a shell script in my previous post.
Means: checkStatus() {
...........
}
read status;
I wanna use the status in the function checkstatus, how... (2 Replies)
Discussion started by: AkumaTay
2 Replies
2. Shell Programming and Scripting
Hi All,
Calling a function with one argument and storing the return value in a shell script is as below:( so far I know)
value="`fun_1 "argument1"`"
Its working perfectly for me.
Can u help me with passing more than one argument and storing the return value
Thnaks in advance
JS (1 Reply)
Discussion started by: jisha
1 Replies
3. Shell Programming and Scripting
Hi ,
I have three funcions f1, f2 and f3 .
f1 calls f2 and f2 calls f3 .
I have a global variable "period" which i want to pass to f3 .
Can i pass the variable directly in the definition of f3 ?
Pls help .
sars (4 Replies)
Discussion started by: sars
4 Replies
4. Shell Programming and Scripting
Hi All,
i have script like below..
echo "1) first option"
echo ""
echo "2) second option"
echo ""
echo "*) please enter the correct option"
read select
case $select in
1) echo "first option selected"
;;
2) echo "second option selected"
;;
*) echo "please enter the correct... (4 Replies)
Discussion started by: Shahul
4 Replies
5. Shell Programming and Scripting
Hi,
I have 2 ksh scripts.
Script1.ksh contains function definition.
script1.ksh
function f1() {
while getopts a:c: args
do
case $args in
a) ARG1=$OPTARG ;;
c) ARG2=$OPTARG ;;
\?) echo "Error no valid Arguments passed"
esac
done
echo $ARG1
echo $ARG2
script2.sh (2 Replies)
Discussion started by: siba.s.nayak
2 Replies
6. Shell Programming and Scripting
I have the following code :
function1 ()
{
print "January"
}
function2()
{
case $1 in
January)
print "Dzisiaj mamy styczen"
;;
*)
;;
}
main()
{ (1 Reply)
Discussion started by: presul
1 Replies
7. Shell Programming and Scripting
Hi,
I have a script that is scheduled with cron and runs every night. The cron part looks like this:
00 20 * * 0,1,2,3,4,5,6 /usr/local/bin/BACKUP TBTARM HOT DELETE
My issue is with the 3rd parameter. Somewhere in the script, i want to tell the script to delete some files if the 3rd... (7 Replies)
Discussion started by: dollypee
7 Replies
8. Shell Programming and Scripting
How to pass the alphabet character as a argument in case and in if block?
ex:
c=$1
if a-z ]]
then
echo "alphabet"
case $1 in
a-z) echo "the value is a alphabet"
edit by bakunin: please use CODE-tags. We REALLY mean it. (9 Replies)
Discussion started by: Roozo
9 Replies
9. Programming
Earlier I had one structure C
typedef struct c
{
int cc;
}CS;
I used to call a library function say int GetData(CS *x) which was returning me the above structure C with data.
GetData(CS *x)
Function call used to be like:
CS CSobj;
GetData(&CSObj);
Now there are two... (12 Replies)
Discussion started by: rupeshkp728
12 Replies
10. UNIX for Beginners Questions & Answers
I am trying to pass a second argument like so:
if ] then
export ARG2=$2
else
message "Second argument not specified: USAGE - $PROGRAM_NAME ARG1 ARG2"
checkerror -e 2 -m "Please specify if it is a history or weekly (H or W) extract in the 2nd argument"
fi
however, it always goes... (4 Replies)
Discussion started by: MIA651
4 Replies
LEARN ABOUT DEBIAN
bup-midx
bup-midx(1) General Commands Manual bup-midx(1)
NAME
bup-midx - create a multi-index (.midx) file from several .idx files
SYNOPSIS
bup midx [-o outfile] <-a|-f|idxnames...>
DESCRIPTION
bup midx creates a multi-index (.midx) file from one or more git pack index (.idx) files.
Note: you should no longer need to run this command by hand. It gets run automatically by bup-save(1) and similar commands.
OPTIONS
-o, --output=filename.midx
use the given output filename for the .midx file. Default is auto-generated.
-a, --auto
automatically generate new .midx files for any .idx files where it would be appropriate.
-f, --force
force generation of a single new .midx file containing all your This will result in the fastest backup performance, but may take a
long time to run.
--dir=packdir
specify the directory containing the .idx/.midx files to work with. The default is $BUP_DIR/objects/pack and $BUP_DIR/indexcache/*.
--max-files
maximum number of .idx files to open at a time. You can use this if you have an especially small number of file descriptors avail-
able, so that midx can complete (though possibly non-optimally) even if it can't open all your .idx files at once. The default
value of this option should be fine for most people.
--check
validate a .midx file by ensuring that all objects in its contained .idx files exist inside the .midx. May be useful for debugging.
EXAMPLE
$ bup midx -a
Merging 21 indexes (2278559 objects).
Table size: 524288 (17 bits)
Reading indexes: 100.00% (2278559/2278559), done.
midx-b66d7c9afc4396187218f2936a87b865cf342672.midx
DISCUSSION
By default, bup uses git-formatted pack files, which consist of a pack file (containing objects) and an idx file (containing a sorted list
of object names and their offsets in the .pack file).
Normal idx files are convenient because it means you can use git(1) to access your backup datasets. However, idx files can get slow when
you have a lot of very large packs (which git typically doesn't have, but bup often does).
bup .midx files consist of a single sorted list of all the objects contained in all the .pack files it references. This list can be binary
searched in about log2(m) steps, where m is the total number of objects.
To further speed up the search, midx files also have a variable-sized fanout table that reduces the first n steps of the binary search.
With the help of this fanout table, bup can narrow down which page of the midx file a given object id would be in (if it exists) with a
single lookup. Thus, typical searches will only need to swap in two pages: one for the fanout table, and one for the object id.
midx files are most useful when creating new backups, since searching for a nonexistent object in the repository necessarily requires
searching through all the index files to ensure that it does not exist. (Searching for objects that do exist can be optimized; for exam-
ple, consecutive objects are often stored in the same pack, so we can search that one first using an MRU algorithm.)
SEE ALSO
bup-save(1), bup-margin(1), bup-memtest(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-midx(1)