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Operating Systems Linux Red Hat Script creates additional file Post 303000814 by anaigini45 on Thursday 20th of July 2017 07:02:36 AM
Old 07-20-2017
Thank you very much for all the suggestions. All 3 suggestions have worked, it does not generate the "15" file anymore.

But as usual, I have some more questions on the suggestions posted.
RavinderSingh's suggestion on the [[ ]] braces :

Code:
if [[ "$DAY" > 15 ]];then

What does the [[ or [ braces mean in the coding language?

On rbatte1's question on which shell I am using, it is bash. Thus I belief this code will work for me.

Smilie

Last edited by rbatte1; 07-21-2017 at 08:46 AM..
 
Test Your Knowledge in Computers #505
Difficulty: Medium
An executable statement may not invoke (or call or execute) another procedure (also called subroutine, function, method, etc.),
True or False?

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DLAGTS(l)								 )								 DLAGTS(l)

NAME
DLAGTS - may be used to solve one of the systems of equations (T - lambda*I)*x = y or (T - lambda*I)'*x = y, SYNOPSIS
SUBROUTINE DLAGTS( JOB, N, A, B, C, D, IN, Y, TOL, INFO ) INTEGER INFO, JOB, N DOUBLE PRECISION TOL INTEGER IN( * ) DOUBLE PRECISION A( * ), B( * ), C( * ), D( * ), Y( * ) PURPOSE
DLAGTS may be used to solve one of the systems of equations (T - lambda*I)*x = y or (T - lambda*I)'*x = y, where T is an n by n tridiagonal matrix, for x, following the factorization of (T - lambda*I) as (T - lambda*I) = P*L*U , by routine DLAGTF. The choice of equation to be solved is controlled by the argument JOB, and in each case there is an option to perturb zero or very small diagonal elements of U, this option being intended for use in applications such as inverse iteration. ARGUMENTS
JOB (input) INTEGER Specifies the job to be performed by DLAGTS as follows: = 1: The equations (T - lambda*I)x = y are to be solved, but diagonal elements of U are not to be perturbed. = -1: The equa- tions (T - lambda*I)x = y are to be solved and, if overflow would otherwise occur, the diagonal elements of U are to be per- turbed. See argument TOL below. = 2: The equations (T - lambda*I)'x = y are to be solved, but diagonal elements of U are not to be perturbed. = -2: The equations (T - lambda*I)'x = y are to be solved and, if overflow would otherwise occur, the diagonal elements of U are to be perturbed. See argument TOL below. N (input) INTEGER The order of the matrix T. A (input) DOUBLE PRECISION array, dimension (N) On entry, A must contain the diagonal elements of U as returned from DLAGTF. B (input) DOUBLE PRECISION array, dimension (N-1) On entry, B must contain the first super-diagonal elements of U as returned from DLAGTF. C (input) DOUBLE PRECISION array, dimension (N-1) On entry, C must contain the sub-diagonal elements of L as returned from DLAGTF. D (input) DOUBLE PRECISION array, dimension (N-2) On entry, D must contain the second super-diagonal elements of U as returned from DLAGTF. IN (input) INTEGER array, dimension (N) On entry, IN must contain details of the matrix P as returned from DLAGTF. Y (input/output) DOUBLE PRECISION array, dimension (N) On entry, the right hand side vector y. On exit, Y is overwritten by the solution vector x. TOL (input/output) DOUBLE PRECISION On entry, with JOB .lt. 0, TOL should be the minimum perturbation to be made to very small diagonal elements of U. TOL should normally be chosen as about eps*norm(U), where eps is the relative machine precision, but if TOL is supplied as non-positive, then it is reset to eps*max( abs( u(i,j) ) ). If JOB .gt. 0 then TOL is not referenced. On exit, TOL is changed as described above, only if TOL is non-positive on entry. Otherwise TOL is unchanged. INFO (output) INTEGER = 0 : successful exit element of the solution vector x. This can only occur when JOB is supplied as positive and either means that a diagonal element of U is very small, or that the elements of the right-hand side vector y are very large. LAPACK version 3.0 15 June 2000 DLAGTS(l)

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