08-23-2011
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I am just trying to extract a line at a time from a file using awk and can't yet extract even the first line using the following:-
awk '/(^) && (NR==1)/ {print $1}' file1
Is there an obvious silly error here?
Thanks (3 Replies)
Discussion started by: sirtrancealot
3 Replies
2. Shell Programming and Scripting
If my file looks like this….
10
20
30
and I want to take each line individually and put it in a variable so it can be read
later in it's on individual test statement, how can I do that? I guess what I'm asking is how can I extract each line individually.
Thanks (5 Replies)
Discussion started by: terryporter51
5 Replies
3. UNIX for Dummies Questions & Answers
I was proposed with the following problem:
The file 'numbers' contains a list of numbers. Write a command to place the
largest one of those numbers in the file 'largest' (there should be nothing
else in that file). Do not use the 'head' command in your answer.
I think if i used the sort... (1 Reply)
Discussion started by: stava
1 Replies
4. Shell Programming and Scripting
Hi,
I would like to extract a certain portion of sentences from a particular sentence i.e. to extract the last section embrace by
input
output
Please advice.
Cheers (6 Replies)
Discussion started by: dwgi32
6 Replies
5. UNIX for Dummies Questions & Answers
Hello there, I am new to unix and would like to do the following, hoping someone would give some guide, thanks in advance.
Lets say i have a file like this:
A w x y w x 0.1
B w x y w x 0.3
C w x y w x 0.7
D w x y w x 0.9
E w x y w x 0.2
So i would like to extract line 1 data where line... (2 Replies)
Discussion started by: seiksoon
2 Replies
6. UNIX for Dummies Questions & Answers
My file looks like this and i need to only extract those with PDT_AP21_B and output it to another file. Can anyone help? Thanks.
PDT_AP21_R,,, 11 TYS,,,,T17D1207230742TYO***T17DS,,C
PDT_AP21_L,,,9631166650001 ,,,,T17D1207230903TYOTYST17DS ,,C... (3 Replies)
Discussion started by: Alyssa
3 Replies
7. UNIX for Dummies Questions & Answers
Hi,
I am trying to extract lines from a text file given a text file containing line numbers to be extracted from the first file. How do I go about doing this? Thanks! (1 Reply)
Discussion started by: evelibertine
1 Replies
8. Shell Programming and Scripting
Hello,
I have a file ff.txt that looks as follows
*ABNA.txt
356
24
36
112
*AC24.txt
457
458
321
2
ABNA.txt and AC24.txt are the files in the folder named foo1. Based on the numbers in the ff.txt file, I want to extract the lines from the corresponding files in the foo1 folder and... (2 Replies)
Discussion started by: mohamad
2 Replies
9. Shell Programming and Scripting
Dear All,
I have to solve the following problems with multiple tab-separated text file but I don't know how. Any help would be greatly appreciated. I have access to Linux mint (but not as a professional).
I have multiple tab-delimited files with the following structure:
file1:
1 44
2 ... (5 Replies)
Discussion started by: Bastami
5 Replies
10. Shell Programming and Scripting
I've a file like this
{multi line
.......
.......
pattern}
{
some other stuff
.........
}
{multi line
.......
.......
pattern}
{
some other stuff
.........
}
and so on (2 Replies)
Discussion started by: aamir_raihan
2 Replies
LEARN ABOUT X11R4
pbmreduce
pbmreduce(1) General Commands Manual pbmreduce(1)
NAME
pbmreduce - read a portable bitmap and reduce it N times
SYNOPSIS
pbmreduce [-floyd|-fs|-threshold ] [-value val] N [pbmfile]
DESCRIPTION
Reads a portable bitmap as input. Reduces it by a factor of N, and produces a portable bitmap as output.
pbmreduce duplicates a lot of the functionality of pgmtopbm; you could do something like pnmscale | pgmtopbm, but pbmreduce is a lot
faster.
pbmreduce can be used to "re-halftone" an image. Let's say you have a scanner that only produces black&white, not grayscale, and it does a
terrible job of halftoning (most b&w scanners fit this description). One way to fix the halftoning is to scan at the highest possible res-
olution, say 300 dpi, and then reduce by a factor of three or so using pbmreduce. You can even correct the brightness of an image, by
using the -value flag.
OPTIONS
By default, the halftoning after the reduction is done via boustrophedonic Floyd-Steinberg error diffusion; however, the -threshold flag
can be used to specify simple thresholding. This gives better results when reducing line drawings.
The -value flag alters the thresholding value for all quantizations. It should be a real number between 0 and 1. Above 0.5 means darker
images; below 0.5 means lighter.
All flags can be abbreviated to their shortest unique prefix.
SEE ALSO
pnmenlarge(1), pnmscale(1), pgmtopbm(1), pbm(5)
AUTHOR
Copyright (C) 1988 by Jef Poskanzer.
02 August 1989 pbmreduce(1)