06-11-2008
Hmmm, looks like you were right. It actually slows it down slightly reading the file in the way you suggested, so the problem is obviously in the "stuff" part.
If the loop only has a few records to handle it's fast, once it gets to a few thousand it slows to a crawl. Curses!
Anyone got any thoughts on way sto improve the performance of the loop?
Last edited by dlam; 06-11-2008 at 06:47 AM..
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I need an assistance in file generation using awk, sed or anything...
I have a big file that i need to filter desired parts only. The objective is to select (and print) the report # having the string "apple" on 2 consecutive lines in every report. Please note that the "apple" line has a HEX... (1 Reply)
Discussion started by: apalex
1 Replies
2. Shell Programming and Scripting
Hi,
This is my first time post a new thread. I have been trying to work on this for the past 2 days and could not find any good solution.
I have 1 long long line ( EDI wrapped file) like below:
NEW*SR*04411763447*279*278*Q~*ZR*AAV*SR*04511763460*SQ*21B37F04~HL*305*304*Q~K~SN1*1*1*SR*05511763461*... (6 Replies)
Discussion started by: vanda_25
6 Replies
3. Shell Programming and Scripting
Hi, I want to get data from Xml file by using sed or awk command. I want to get the following result :
mon titre 1;Createur1;Dossier1
mon titre 1;Createur1;Dossier1
and save it in cvs file (fichier.cvs).
FROM this Xml file (test.xml):
<playlist version="1">
<trackList>
<track>... (1 Reply)
Discussion started by: yeclota
1 Replies
4. Shell Programming and Scripting
How to cut data from big file
my file around 30 gb
I tried "head -50022172 filename > newfile.txt ,and tail -5454283 newfile.txt. It's slowy.
afer that I tried sed -n '46467831,50022172p' filename > newfile.txt ,also slow
Please recommend me , faster command to cut some data from... (4 Replies)
Discussion started by: almanto
4 Replies
5. UNIX for Dummies Questions & Answers
Hi everyone,
I cannot figure out how I can do a search in a file that has Names, Surnames, Addresses and telephone number of a number of people.
Here is an example of the data file
Daisy:Hunter:490 London Road:07313196347
Richard:Murphy:983 Main Road:07002625997
Isobel:Magnusson:133 London... (1 Reply)
Discussion started by: philipisaia
1 Replies
6. Shell Programming and Scripting
Hi,
I have a (quite large) data file which looks like:
_____________
header part..
more header part..
x1 x2 x3 x4 x5 x6
x7 x8 x9 x10 x11 x12
x13 ...
... x59 x60
y1 y2 y3 y4...
... y100
______________
where x1, x2,...,x60 and y1, y2,...y100 are numbers of 10 digits (so each line... (5 Replies)
Discussion started by: lego
5 Replies
7. Shell Programming and Scripting
Hello,
I have a big data file (160 MB) full of records with pipe(|) delimited those fields. I`m sorting the file on the first field.
I'm trying to sort with "sort" command and it brings me 6 minutes.
I have tried with some transformation methods in perl but it results "Out of memory". I was... (2 Replies)
Discussion started by: rubber08
2 Replies
8. Shell Programming and Scripting
Hi,
I am new to this world..
Using expect i loging to router and checking ping response to my links.
I need to genarate report using this output and that report contains only three file link name, packet loss, latency.
my output of script is like below:
-bash-3.00$ monmw/mwbkp... (2 Replies)
Discussion started by: jkmistry
2 Replies
9. Shell Programming and Scripting
Hi everyone,
I am trying to write a bash script which reads a data file and does some algebraic operations.
here is the structure of data.xml file that I have;
1 <data>
2 .
3 .
4 .
5 </data>
6 <data>
7 .
8 .
9 .
10</data>
etc.
Each data block contains same number of lines (say... (4 Replies)
Discussion started by: hayreter
4 Replies
10. Shell Programming and Scripting
Below is the output of a DB2 command. Now I have 2 requirements...
Database Partition 0 -- Database TESTDB1 -- Active Standby -- Up 213 days 02:33:07 -- Date 02/22/2016 17:04:50
HADR Information:
Role State SyncMode HeartBeatsMissed LogGapRunAvg (bytes)
Standby ... (2 Replies)
Discussion started by: rlokesh27
2 Replies
LEARN ABOUT DEBIAN
cdbmake
cdbmake(1) General Commands Manual cdbmake(1)
NAME
cdbmake - create a constant database
SYNOPSIS
cdbmake cdb cdb.tmp
DESCRIPTION
cdbmake reads a series of encoded records from its standard input and writes a constant database to cdb.
cdbmake ensures that cdb is updated atomically, so programs reading cdb never have to wait for cdbmake to finish. It does this by first
writing the database to cdb.tmp and then moving cdb.tmp on top of cdb. If cdb.tmp already exists, it is destroyed. The directories con-
taining cdb.tmp and cdb must be writable to cdbmake; they must also be on the same filesystem.
cdbmake always makes sure that cdb.tmp is safely written to disk before it replaces cdb. If the input is in a bad format or if cdbmake has
any trouble writing cdb.tmp to disk, cdbmake complains and leaves cdb alone.
RECORD FORMAT
Records are indexed by keys. A key is a string. cdb is structured so that another program, starting from a key, can quickly find the rel-
evant record. cdbmake allows several records with the same key, although most readers take only the first record, and cdbmake slows down
somewhat if there are many records with the same key.
cdbmake and cdbdump(1) preserve the order of records.
A record is encoded for cdbmake as +klen,dlen:key->data followed by a newline. Here klen is the number of bytes in key and dlen is the
number of bytes in data. The end of data is indicated by an extra newline. For example:
+3,5:one->Hello
+3,7:two->Goodbye
key and data may contain any characters, including colons, dashes, newlines, and nulls.
Keys and data do not have to fit into memory. A database cannot exceed 4 gigabytes.
cdb is portable across machines.
SEE ALSO
cdbdump(1), cdbget(1), cdbstats(1)
cdbmake(1)