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Top Forums Shell Programming and Scripting Abnormality while piping tr command output to sed Post 302746495 by chidori on Wednesday 19th of December 2012 01:16:45 PM
Old 12-19-2012
Abnormality while piping tr command output to sed

i have a file seperated each line seperated by newline. For example
Code:
alpha
beta
gamma

i am trying to replace the newlines to "," but dont want , present at the end of the line so i am trying the below one liner . but not sure whats wrong but its not working
cat myfile | tr -s '\n' ',' | sed 's/,$//'

But when i try it this way , its working
echo "alpha,beta,gamma," | sed 's/,$//'

can someone please explain me this behaviour.
 

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clarfgp.f(3)							      LAPACK							      clarfgp.f(3)

NAME
clarfgp.f - SYNOPSIS
Functions/Subroutines subroutine clarfgp (N, ALPHA, X, INCX, TAU) CLARFGP generates an elementary reflector (Householder matrix) with non-negatibe beta. Function/Subroutine Documentation subroutine clarfgp (integerN, complexALPHA, complex, dimension( * )X, integerINCX, complexTAU) CLARFGP generates an elementary reflector (Householder matrix) with non-negatibe beta. Purpose: CLARFGP generates a complex elementary reflector H of order n, such that H**H * ( alpha ) = ( beta ), H**H * H = I. ( x ) ( 0 ) where alpha and beta are scalars, beta is real and non-negative, and x is an (n-1)-element complex vector. H is represented in the form H = I - tau * ( 1 ) * ( 1 v**H ) , ( v ) where tau is a complex scalar and v is a complex (n-1)-element vector. Note that H is not hermitian. If the elements of x are all zero and alpha is real, then tau = 0 and H is taken to be the unit matrix. Parameters: N N is INTEGER The order of the elementary reflector. ALPHA ALPHA is COMPLEX On entry, the value alpha. On exit, it is overwritten with the value beta. X X is COMPLEX array, dimension (1+(N-2)*abs(INCX)) On entry, the vector x. On exit, it is overwritten with the vector v. INCX INCX is INTEGER The increment between elements of X. INCX > 0. TAU TAU is COMPLEX The value tau. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 105 of file clarfgp.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 clarfgp.f(3)
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