10-17-2010
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I have a script below. It get's the data from the output of a script that is running hourly. My problem is every time my script runs, it deletes the previous data and put the current data. Please see output below. What I would like to do is to have the hourly output to be appended on the... (3 Replies)
Discussion started by: ayhanne
3 Replies
2. Shell Programming and Scripting
Hi All,
I am writing a Perl script such that the output from "perl myscript.pl file1" to be appended to another file name called file2.
I tried out with the below code but couldn't work.
Can any expert give me some advice?
open(OUTPUT, 'perl myscript.pl file1 |');
close OUTPUT;... (7 Replies)
Discussion started by: Raynon
7 Replies
3. UNIX for Dummies Questions & Answers
I am running a command which has a parameter that outputs the results to a file each time it is run.
Here is the command:
--fullresult=true > importlog.xml
Can I add the output to the file rather than creating a new one which overwrites the existing one?
If not can I make the file name... (2 Replies)
Discussion started by: Sepia
2 Replies
4. UNIX for Dummies Questions & Answers
I've setup a cron job that greps a file every five minutes and then writes (appends) the grep output/result to another file:
grep "monkey" zoo.log | tail -1 >> cron-zoo-log
Is there any way I can add the date and time (timestamp) to the cron-zoo-log file for each time a new line was added?
... (12 Replies)
Discussion started by: Sepia
12 Replies
5. Shell Programming and Scripting
I'm trying to output the contents of the infile to the outfile using Append.
I will want to use append but the syntax doesn't seem to be working !
Input file (called a.txt) contains this:
a
a
a
b
b
b
I'm running shell script (called k.sh) from Unix command-line like this:
./k.sh .... (1 Reply)
Discussion started by: script_op2a
1 Replies
6. UNIX for Dummies Questions & Answers
Noob question!
I know almost nothing so far, and I'm trying to teach myself from books, on a typical command line without using scripts how would I append output from a sort to a file in a completely different directory?
example:
If I'm sorting a file in my documents directory but I... (2 Replies)
Discussion started by: Byrang
2 Replies
7. Shell Programming and Scripting
Hi All,
I am working on nawk script, has the small function which prints the output on the screen.Am trying to print/append the same output in a file.
Basically nawk script should print the output on the console/screen and as well it should write/append the same result to a file.
script :... (3 Replies)
Discussion started by: Optimus81
3 Replies
8. Shell Programming and Scripting
Hi, I have a large data file, want to separate it into 100 part and export one specific field as a file; then I want to append each part's column into one file. How to realize that?
1 2 3 1
2 3 4 2
2 3 4 3
3 3 4 4
3 4 5 5
3 4 5 6
I want the last column of the data file, e.g divide it... (5 Replies)
Discussion started by: wanliushao
5 Replies
9. Shell Programming and Scripting
Hello,
i'm trying to force a command to read every second from an interface
watch -n1 (command) /dev/x | cat >> output
but it continue to overwrite the file, without append the content
Thanks and advace for help as usual
regards (4 Replies)
Discussion started by: Board27
4 Replies
10. Shell Programming and Scripting
Hi All,
I have two files
File1
frame,007C1 server1_Parent
frame,007C3 server2_Silver
frame,007EE server3_Bronze
frame,00855 server4_Parent
frame,00856 server4_Parent
frame,00858 server5_Parent
frame,008FA server6_Silver
frame,008FB server6_Silver
frame,008FC server6_Silver... (2 Replies)
Discussion started by: ranjancom2000
2 Replies
LEARN ABOUT XFREE86
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)