Faster way to multiply a file Nth times?

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Faster way to multiply a file Nth times?
# 1  
Old 08-05-2011
Faster way to multiply a file Nth times?

Basically, my problem is to multiply my file to $c times. Is there a faster way to do this?

while [[ $c -ne 0 ]]; do
    cat file1.txt
done > file2.txt

I appreciate your help!
# 2  
Old 08-05-2011
so, you mean, if your file1.txt is having the below lines


then as per your program, 100 times, abcd should be in file2.txt ?
# 3  
Old 08-05-2011
perl -0777 -ne 'print $_ x 100' INPUTFILE

This User Gave Thanks to yazu For This Post:
# 4  
Old 08-05-2011
@itkamaraj - yes, that's what I am trying to do. My code do that but the performance is off.

@yazu - will try that. Would that run in aix?

Thanks to both of you.
# 5  
Old 08-05-2011
@yazu - will try that. Would that run in aix?
If it has perl (and I believe it has).
# 6  
Old 08-05-2011
Yazu, solution is best

try that.. let us know if you dont have perl
These 2 Users Gave Thanks to itkamaraj For This Post:
# 7  
Old 08-05-2011
The perl works! Thanks to both of you Smilie
Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Multiply values from a file

Hi All, I extracted a file using an awk command like this awk '{print substr($0,78,5)"," substr($0,59,6) "," substr($0,81,3) "," substr($0,11,7)}' file1 >> OUTPUT cat OUTPUT 00001,100000,005,0000080 00001,100000,008,0000220 00001,100000,001,0001000 00010,100000,001,0000400 I want... (3 Replies)
Discussion started by: arunkumar_mca
3 Replies

2. UNIX for Dummies Questions & Answers

What is the faster way to grep from huge file?

Hi All, I am new to this forum and this is my first post. My requirement is like to optimize the time taken to grep the file with 40000 lines. There are two files FILEA(40000 lines) FILEB(40000 lines). The requirement is like this, both the file will be in the format below... (11 Replies)
Discussion started by: mad man
11 Replies

3. Shell Programming and Scripting

Replace a value of Nth field of nth row

Using Awk, how can I achieve the following? I have set of record numbers, for which, I have to replace the nth field with some values, say spaces. Eg: Set of Records : 4,9,10,55,89,etc I have to change the 8th field of all the above set of records to spaces (10 spaces). Its a delimited... (1 Reply)
Discussion started by: deepakwins
1 Replies

4. Shell Programming and Scripting

Calculating average for every Nth line in the Nth column

Is there an awk script that can easily perform the following operation? I have a data file that is in the format of 1944-12,5.6 1945-01,9.8 1945-02,6.7 1945-03,9.3 1945-04,5.9 1945-05,0.7 1945-06,0.0 1945-07,0.0 1945-08,0.0 1945-09,0.0 1945-10,0.2 1945-11,10.5 1945-12,22.3... (3 Replies)
Discussion started by: ncwxpanther
3 Replies

5. Shell Programming and Scripting

Using AWK to find top Nth values in Nth column

I have an awk script to find the maximum value of the 2nd column of a 2 column datafile, but I need to find the top 5 maximum values of the 2nd column. Here is the script that works for the maximum value. awk 'BEGIN { subjectmax=$1 ; max=0} $2 >= max {subjectmax=$1 ; max=$2} END {print... (3 Replies)
Discussion started by: ncwxpanther
3 Replies

6. HP-UX

Faster command for file copy than cp ?

we have 30 GB files on our filesystem which we need to copy daily to 25 location on the same machine (but different filesystem). cp is taking 20 min to do the copy and we have 5 different thread doing the copy. so in all its taking around 2 hr and we need to reduce it. Is there any... (9 Replies)
Discussion started by: shipra_31
9 Replies

7. Shell Programming and Scripting

Script to parse a file faster

My example file is as given below: conn=1 uid=oracle conn=2 uid=db2 conn=3 uid=oracle conn=4 uid=hash conn=5 uid=skher conn=6 uid=oracle conn=7 uid=mpalkar conn=8 uid=anarke conn=1 op=-1 msgId=-1 - fd=104 slot=104 LDAPS connection from to conn=2 op=-1 msgId=-1 -... (7 Replies)
Discussion started by: sags007_99
7 Replies

8. Shell Programming and Scripting

Which is faster? Reading from file or 'ps'

Hi There... I have an application which starts up many different processes under different names and I'm creating a script to tell me which processes are running (approx 30 different processes). To do this, I parse the results of a ps -u $USER. My question is, will my script be faster if I run... (2 Replies)
Discussion started by: orno
2 Replies
Login or Register to Ask a Question