Using awk to process individual lines is extremely wasteful. It's efficient at batch data but takes time to load and quit. You're loading an entire programming language, putting 20 bytes into it, processing those 20 bytes, and waiting for it to quit every single line. It's like only saying one word per telephone call...
Since you're using awk anyway, why not do it all in awk?
Code:
# NR is the line number. So, for lines 4 and up, set the first record,
# aka $1, to the line number minus three.
# The 1 after the } makes it print every line.
$ awk '{ if(NR>3) $1=NR-3 } 1' < data
; position restraints for System_&_XYL of Protein in water
[ position_restraints ]
; i funct fcx fcy fcz
1 1 100 100 100
2 1 100 100 100
3 1 100 100 100
$
I know my code is clumsy. I'm a novice and need stuff done quickly and in a practical way. Thanks a lot for the heads up. The awk solution is wonderful.
Hey all. Thanks in advance for any help you can give, hopefully this is an easy one. I want to create a loop to run a simple performance monitor like vmstat and record it to a file, but have very limited scripting skills (obviously).
Starting with this...
date >> /var/log/perfmon.log
vmstat... (2 Replies)
I have written a script that countsdown from 20 to 1 and has a sleep in between each count but I want to make it sleep for half a second but I get errors whenever I change the sleep from 1 second to half a second any ideas? I am using Sun OS 5.9 heres what I've got:
X=0
while
do
echo... (3 Replies)
Hello all,
I am trying to write a simple script that will parse through a text/properties file and check a couple of if statements.
Here is what I have so far:
FILENAME=$1
while read line
do
echo $line
done < $FILENAME
When I call ./simple.sh testfile.txt I recieve a file or... (7 Replies)
Hello
I am a beginner of shell scripting and i am having trouble to do a for loop.
I want a for loop to do stuff 3 times.
i.e.
in visual basic i do this
for (counter = 0; counter < 3; counter++)
on my shell script i have something like this at the moment
... (7 Replies)
Hi All,
How can we use read line using the index value of a FOR loop?
eg:
pt_mstr,pt_status,8
pt_mstr,pt_buyer,8
pt_mstr,pt_sfty_stk,8
pt_mstr,pt_ord_pol,3
pt_mstr,pt_capacity,8
pt_mstr,pt_plan_ord,3
pt_mstr,pt_ord_mult,8
From this file i want to read the line2, 3 and 4 only using a FOR... (3 Replies)
Hi I'm writing a bash script which will read an input file and look for occurrences of the current user ($USER) executing the script. When i find the occurrence of the username I take that line and append it to a file with a line number and bracket display next to line.
The input file has been... (12 Replies)
apologies for the basicness of this question, but within a for loop how can i "list" my values as opposed to adding them to the same line
for example if i use this it works fine
for n in peter paul david
do
echo "my name is $n"
done
but i wanted to list my items ( i have quite a... (2 Replies)
Hi
I am using while loop, below, to read lines from a very large file, around 400,000 rows. The script works fine until around line 300k but then starts giving incorrect result.
I have tried running the script with a smaller data set and it works fine. I made sure to include the line where... (2 Replies)
Hi,
I am trying to read a file line by line inside of a while loop. This while loop is part of a here document.
while read line
do
ssh -t $2@$remotehost <<REMOTE
ls path/to/dir > $path_to_dir
while read line1
do
echo "LINE --- $line"
done... (4 Replies)
Based on text file:
PATH:/media/hdd/Media/Video/title1 FILE:/media/cache/281662-14.jpg
PATH:/media/hdd/Media/Video/title2 FILE:/media/cache/281662-15.jpg
PATH:/media/hdd/Media/Video/title3 FILE:/media/cache/281662-16.jpg
PATH:/media/hdd/Media/Video/title4 FILE:/media/cache/281662-17.jpg... (12 Replies)
Discussion started by: TiedCone
12 Replies
LEARN ABOUT SUSE
gsl-randist
GSL-RANDIST(1) General Commands Manual GSL-RANDIST(1)NAME
gsl-randist - generate random samples from various distributions
SYNOPSYS
gsl-randist seed n DIST param1 param2 [..]
DESCRIPTION
gsl-randist is a demonstration program for the GNU Scientific Library. It generates n random samples from the distribution DIST using the
distribution parameters param1, param2, ...
EXAMPLE
Here is an example. We generate 10000 random samples from a Cauchy distribution with a width of 30 and histogram them over the range -100
to 100, using 200 bins.
gsl-randist 0 10000 cauchy 30 | gsl-histogram -100 100 200 > histogram.dat
A plot of the resulting histogram will show the familiar shape of the Cauchy distribution with fluctuations caused by the finite sample
size.
awk '{print $1, $3 ; print $2, $3}' histogram.dat | graph -T X
SEE ALSO gsl(3), gsl-histogram(1).
AUTHOR
gsl-randist was written by James Theiler and Brian Gough. Copyright 1996-2000; for copying conditions see the GNU General Public Licence.
This manual page was added by the Dirk Eddelbuettel <edd@debian.org>, the Debian GNU/Linux maintainer for GSL.
GNU GSL-RANDIST(1)
09-19-2011
