"Difference between two cmmands that did the same thing"

Post #302612879 by Corona688 on Monday 26th of March 2012 12:15:17 PM

You are running two programs to do the job of one. The 'more' does essentially nothing -- printing the file and feeding it into grep, even though grep is fully capable of reading files all by itself.

This is essentially the same problem as useless use of cat.
 
Test Your Knowledge in Computers #355
Difficulty: Medium
BWK awk, also known as nawk, refers to the awk version by Ken Thompson.
True or False?

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pgmtexture(1)						      General Commands Manual						     pgmtexture(1)

NAME
pgmtexture - calculate textural features on a portable graymap SYNOPSIS
pgmtexture [-d d] [pgmfile] DESCRIPTION
Reads a portable graymap as input. Calculates textural features based on spatial dependence matrices at 0, 45, 90, and 135 degrees for a distance d (default = 1). Textural features include: (1) Angular Second Moment, (2) Contrast, (3) Correlation, (4) Variance, (5) Inverse Difference Moment, (6) Sum Average, (7) Sum Variance, (8) Sum Entropy, (9) Entropy, (10) Difference Variance, (11) Difference Entropy, (12, 13) Information Measures of Correlation, and (14) Maximal Correlation Coefficient. Algorithm taken from: Haralick, R.M., K. Shanmugam, and I. Dinstein. 1973. Textural features for image classification. IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621. BUGS
The program can run incredibly slow for large images (larger than 64 x 64) and command line options are limited. The method for finding (14) the maximal correlation coefficient, which requires finding the second largest eigenvalue of a matrix Q, does not always converge. REFERENCES
IEEE Transactions on Systems, Man, and Cybertinetics, SMC-3(6):610-621. SEE ALSO
pgm(5), pnmcut(1) AUTHOR
Copyright (C) 1991 by Texas Agricultural Experiment Station, employer for hire of James Darrell McCauley. 22 Aug 1991 pgmtexture(1)

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