03-08-2013
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi, buddies out there.
I have a text file ( only one column ) which I created using vi editor. The file contains duplicate rows and I would like to select distinct rows, how to go on it using unix command:
file content =
apple
apple
orange
watermelon
apple
orange
Can it be done... (7 Replies)
Discussion started by: merry susana
7 Replies
2. UNIX for Dummies Questions & Answers
How do I create a script that provides a count of distinct values of a particular field in a file utilizing commonly available UNIX commands (sh or awk)?
Field1|Field2|Field3|Field4
AAA|BBB|CCC|DDD
111|222|333|777
AAA|EEE|ZZZ|EEE
111|555|333|444
AAA|EEE|CCC|DDD
111|222|555|444
For... (2 Replies)
Discussion started by: Refresher
2 Replies
3. Shell Programming and Scripting
I have got a file like this
003ABC00281020091005000100042.810001 ... (8 Replies)
Discussion started by: Maruti
8 Replies
4. Shell Programming and Scripting
Hi ,
I have a similar problem.
Please can anyone help me with a shell script or a perl.
I have a flat file like this
fruit country
apple germany
apple india
banana pakistan
banana saudi
mango india
I want to get a output like
fruit country
apple ... (7 Replies)
Discussion started by: smalya
7 Replies
5. UNIX for Dummies Questions & Answers
If i have a file sample.txt with more than 10 columns and 11th column as following data. would it be possible to get the distinct counts of values in single shot,Thank you.
Y
Y
N
N
N
P
P
o
Expected Result:
Value count
Y 2
N 3
P 2 (2 Replies)
Discussion started by: Ariean
2 Replies
6. Shell Programming and Scripting
Hi All,
I've got a text file which is Postcode,Postcode, Travel_time and I want to select all of the rows where the 3rd column value is over 255. Can someone show me the magic on how to do this?
Originally it did contain 4 columns but i've managed to strip out the first 3 using:
cat textfile |... (3 Replies)
Discussion started by: gman
3 Replies
7. UNIX for Dummies Questions & Answers
I have 2 files,
file01= 7 columns, row unknown (but few)
file02= 7 columns, row unknown (but many)
now I want to create an output with the first field that is shared in both of them and then subtract the results from the rest of the fields and print there
e.g.
file 01
James|0|50|25|10|50|30... (1 Reply)
Discussion started by: A-V
1 Replies
8. Shell Programming and Scripting
Hi ,
i need to display only one of duplicated values and merged them in one record only when tag started with 3100.2.128.8
3100.2.97.1=192.168.0.12
3100.2.128.8=418/66/03e9/0044801
3100.2.128.8=418/66/03ea/0044601
3100.2.128.8=418/66/03e9/0044801
3100.2.128.8=418/66/03ea/0044601... (5 Replies)
Discussion started by: OTNA
5 Replies
9. Shell Programming and Scripting
Hi Folks,
I have the below feed file named abc1.txt in which you can see there is a title and below is the respective values in the rows and it is completely pipe delimited file ,.
... (3 Replies)
Discussion started by: punpun66
3 Replies
10. UNIX for Dummies Questions & Answers
Hi
How can I extract sequences from a fasta file with respect a certain criteria? The beginning of my file (containing in total more than 1000 sequences) looks like this:
>H8V34IS02I59VP
SDACNDLTIALLQIAREVRVCNPTFSFRWHPQVKDEVMRECFDCIRQGLG
YPSMRNDPILIANCMNWHGHPLEEARQWVHQACMSPCPSTKHGFQPFRMA... (6 Replies)
Discussion started by: Marion MPI
6 Replies
LEARN ABOUT REDHAT
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)