09-26-2009
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
I am new to shell scripting and have a question. I would like to redirect the output of a command to multiple files, each file holding the exact same copy. From what I read from the bash manpage and from some searching it seems it cannot be done within the shell except setting up a loop. Is... (3 Replies)
Discussion started by: cbkihong
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2. UNIX for Dummies Questions & Answers
I have a program that is reading strings into a vector from a file. Currently I am using this command:
a.out < file1
The program runs and prints the contents of the vector to the screen, like its supposed to. The problem is that it needs to read in 3 files to fill the vector. Is there anyway... (4 Replies)
Discussion started by: Matrix_Prime
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3. Shell Programming and Scripting
Hi,
I needs to split *.txt files from single directory depends on the some mutltiple input values. i have wrote the code like below
for file in *.txt
do
grep -i -h "value1|value2" $file > $file;
done.
My requirment is more input values needs to be given in grep; let us say 50... (3 Replies)
Discussion started by: arund_01
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4. Shell Programming and Scripting
How to redirect the output to multiple files without putting on console
I tried tee but it writes to STDOUT , which I do not want.
Test.sh
------------------
#!/bin/ksh
echo "Hello " tee -a file1 file2
----------------------------
$>./Test.sh
$>
Expected output:
-------------------... (2 Replies)
Discussion started by: prashant43
2 Replies
5. Shell Programming and Scripting
Hi everyone!!
I have a database table, which has file_name as one of its fields.
Example:
File_ID File_Name Directory Size
0001 UNO_1232 /apps/opt 234
0002 UNO_1234 /apps/opt 788
0003 UNO_1235 /apps/opt 897
0004 UNO_1236 /apps/opt 568
I have to... (3 Replies)
Discussion started by: ss3944
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6. UNIX for Dummies Questions & Answers
Hi,
i know how to
a) redirect stdout and stderr to one file,
b) and write to two files concurrently with same output using tee command
Now, i want to do both the above together.
I have a script and it should write both stdout and stderr in one file and also write the same content to... (8 Replies)
Discussion started by: ysrini
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7. Shell Programming and Scripting
Hi,
I am new to script and I want find one string from multiple files in diff directories and put that out put to new file.
Like I have A,B & C directories and each has multiple files but one file is unic in all the directories like COMM.txt
Now I want write script to find the string... (8 Replies)
Discussion started by: Mahessh123
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8. Shell Programming and Scripting
I came across the command string on https://www.unix.com/shell-programming-scripting/141885-awk-removing-data-before-after-pattern.html which was what I was looking for to be able to remove data before a certain pattern. However, outputting the result to a file seems to work on an individual basis... (4 Replies)
Discussion started by: HLee1981
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9. Shell Programming and Scripting
Hi!
I'm new in awk and I need some help.
I have a folder with a lot of files and I need that awk do something in each file and print a new file with the output. The input file name should be modified when I print the outpu files.
Thanks in advance for help!
:-)
ciao (5 Replies)
Discussion started by: gabrysfe
5 Replies
10. Shell Programming and Scripting
Hi,
I have many test*.ft1 files to which I want to read as input for a script called
pipe2txt.tcl and print the output in each separate file.
For example,
pipe2txt.tcl < test001.ft1 > test001.txt
How can I read many files in this maner?
thank you very much,
Best,
Pahuja (5 Replies)
Discussion started by: Pahuja
5 Replies
LEARN ABOUT DEBIAN
ppmchange
ppmchange(1) General Commands Manual ppmchange(1)
NAME
ppmchange - change all pixels of one color to another in a portable pixmap
SYNOPSIS
ppmchange [ -closeness closeness_percent ] [ -remainder remainder_color ] [ oldcolor newcolor ] ... [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Changes all pixels of oldcolor to newcolor. You may specify up to 256 oldcolor/newcolor pairs on the
command line. ppmchange leaves all colors not mentioned unchanged, unless you specify the -remainder option, in which case they are all
changed to the single specified color.
You can specify that colors similar, but not identical, to the ones you specify get replaced by specifying a "closeness" factor.
The colors can be specified in five ways:
o A name, assuming that a pointer to an X11-style color names file was compiled in.
o An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to 4-digit hexadecimal numbers.
o An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point numbers between 0 and 1.
o For backwards compatibility, an old-X11-style hexadecimal number: #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.
o For backwards compatibility, a triplet of numbers separated by commas: r,g,b, where r g and b are floating point numbers between 0
and 1. (This style was added before MIT came up with the similar rgbi style.)
If a pixel matches two different oldcolors, ppmchange replaces it with the newcolor of the leftmost specified one.
OPTIONS
-closeness closeness_percent
closeness is an integer per centage indicating how close to the color you specified a pixel must be to get replaced. By default, it
is 0, which means the pixel must be the exact color you specified.
A pixel gets replaced if the distance in color between it and the color you specified is less than or equal to closeness.
The "distance" in color is defined as the cartesian sum of the individual differences in red, green, and blue intensities between
the two pixels, normalized so that the difference between black and white is 100%.
This is probably simpler than what you want most the time. You probably would like to change colors that have similar chrominance,
regardless of their intensity. So if there's a red barn that is variously shadowed, you want the entire barn changed. But because
the shadowing significantly changes the color according to ppmchange's distance formula, parts of the barn are probably about as
distant in color from other parts of the barn as they are from green grass next to the barn.
Maybe ppmchange will be enhanced some day to do chrominance analysis.
-remainder color
ppmchange changes all pixels which are not of a color for which you specify an explicit replacement color on the command line to
color color.
An example application of this is
ppmchange -remainder=black red red
to lift only the red portions from an image, or
ppmchange -remainder=black red white | ppmtopgm
to create a mask file for the red portions of the image.
SEE ALSO
pgmtoppm(1), ppmcolormask(1), ppm(5)
AUTHOR
Wilson H. Bent. Jr. (whb@usc.edu) with modifications by Alberto Accomazzi (alberto@cfa.harvard.edu)
07 January 2001 ppmchange(1)