07-14-2011
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have to update last line of a text file with the number of lines in that file. This last line will have text such as 0.0000 and I should replace this with number lines. If lines are 20 then it should be replaced with 00020. Any sed or awk cmd help would be appreciated (3 Replies)
Discussion started by: bmkux
3 Replies
2. UNIX for Dummies Questions & Answers
I have been googling, but cannot find that works for me.
I have a text file tmp.out with contents:
sadfsdf sdfosuidhfousdhof soduhf osdfu osudfhosudhfd
sdfgsdfg
asdfiojhsdf asdoludhflsdjfhskldjfhsdjdlfsjdhnlj h sdja
ouahsdjdafkljsa
oljhljh
I have another file... (11 Replies)
Discussion started by: ChicagoBlues
11 Replies
3. Shell Programming and Scripting
I have file with 10000 records and i need to delete the lines in single shot based on line number range say from 10 to 51 , 53 to 59 , 105 to 107, 311 to 592 etc... between range works fine for me but how to achive for above case? please help
sed '10,51 {d}' infile > outfile (5 Replies)
Discussion started by: zooby
5 Replies
4. Shell Programming and Scripting
i need to delete the lines is match from file data 1 & data 2
please help?
data 1
4825307
4825308
4825248
4825309
4825310
4825311
4825336
data 2
4825248 0100362210 Time4Meal 39.00 41.73 MO & MT MT SMS
4825305 0100367565... (2 Replies)
Discussion started by: ooilinlove
2 Replies
5. Shell Programming and Scripting
Hi
I have a file with lines ending with a date in format dd/mm/yyyy see example below:
a|b|c|08/01/2011
d|a|e|31/11/2010
e|d|f|20/11/2010
f|s|r|18/01/2011
What I would like to do is delete all lines with a date older than 30 days.
With above example I should be left with a file... (5 Replies)
Discussion started by: fas1
5 Replies
6. Shell Programming and Scripting
I have a file with ~200K lines, I need to delete 4K lines in it. There is no range.
I do have the line numbers of the lines which I want to be deleted.
I did tried using
> cat del.lines
sed '510d;12d;219d;......;3999d' file
> source del.lines
Word too long.
I even tried... (2 Replies)
Discussion started by: novice_man
2 Replies
7. UNIX for Dummies Questions & Answers
Hi,
I have written a script that returns the line number of the pattern i want and i stored the line number in a variable(getlinenumber).Now i want to delete all the lines in a file above this line number which is stored in a variable.
i am using sed '1,$getlinenumberd' > file1.txt which is... (2 Replies)
Discussion started by: learninguser235
2 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I have written a script that returns the line number of the pattern i want and i stored the line number in a variable.Now i want to delete all the lines in a file above this line number which is stored in a variable.
i am using sed '1,$getlinenumberd' > file1.txt which is not working(wrog... (5 Replies)
Discussion started by: learninguser235
5 Replies
9. UNIX for Dummies Questions & Answers
Dear everyone,
I have a file with 900 lines (there is only numbers in one line, no string),
I only need the lines 2+3n (n=0,1...296), i.e line 2, 5, 8, 11...888.
I tried google but only the results such as how to delete all the odd lines or all the even lines with 'awk' command.
Thanks in... (4 Replies)
Discussion started by: phamnu
4 Replies
10. UNIX for Advanced & Expert Users
Hi ,
i have a file with data as below.This is same file. But actual file contains to many rows.
i want to search for a string "Field 039 00" and delete that line and previous 3 lines in that file.. Can some body suggested me how can i do using either sed or awk command ?
Field 004... (7 Replies)
Discussion started by: vadlamudy
7 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)