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Full Discussion: Extract file name based on the pattern
Top Forums UNIX for Beginners Questions & Answers Extract file name based on the pattern Post 302985887 by bakunin on Wednesday 16th of November 2016 07:28:52 PM
Old 11-16-2016
Quote:
Originally Posted by prajaktaraut
The logic is, the command should look for "DATA_" and pick rest of the filename before "_F"
You can do that with a simple variable expansion:

Code:
filename="ABC_DATA_BAD5A_RO_F_20161104.CSV"
ftmp="${filename##*DATA_}"         # gives "BAD5A_RO_F_20161104.CSV"
result="${ftmp%%_F*}"              # gives "BAD5A_RO"

You can get the same with many other text filters in UNIX: sed, awk, ... All these methods will be far slower than the variable expansion, though, even if this takes a step in between. It is possible to put that all in one step, but it would be ugly and cumbersome to do so, while this remains readable and understandable.

I hope this helps.

bakunin
Last edited by bakunin; 11-17-2016 at 03:14 AM.. Reason: shouldn't write posts while half asleep
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT DEBIAN

slags2

slags2.f(3)							      LAPACK							       slags2.f(3)

NAME

       slags2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slags2 (UPPER, A1, A2, A3, B1, B2, B3, CSU, SNU, CSV, SNV, CSQ, SNQ)
	   SLAGS2

Function/Subroutine Documentation
   subroutine slags2 (logicalUPPER, realA1, realA2, realA3, realB1, realB2, realB3, realCSU, realSNU, realCSV, realSNV, realCSQ, realSNQ)
       SLAGS2

       Purpose:

	    SLAGS2 computes 2-by-2 orthogonal matrices U, V and Q, such
	    that if ( UPPER ) then

		      U**T *A*Q = U**T *( A1 A2 )*Q = ( x  0  )
					( 0  A3 )     ( x  x  )
	    and
		      V**T*B*Q = V**T *( B1 B2 )*Q = ( x  0  )
				       ( 0  B3 )     ( x  x  )

	    or if ( .NOT.UPPER ) then

		      U**T *A*Q = U**T *( A1 0	)*Q = ( x  x  )
					( A2 A3 )     ( 0  x  )
	    and
		      V**T*B*Q = V**T*( B1 0  )*Q = ( x  x  )
				      ( B2 B3 )     ( 0  x  )

	    The rows of the transformed A and B are parallel, where

	      U = (  CSU  SNU ), V = (	CSV SNV ), Q = (  CSQ	SNQ )
		  ( -SNU  CSU )      ( -SNV CSV )      ( -SNQ	CSQ )

	    Z**T denotes the transpose of Z.

       Parameters:
	   UPPER

		     UPPER is LOGICAL
		     = .TRUE.: the input matrices A and B are upper triangular.
		     = .FALSE.: the input matrices A and B are lower triangular.

	   A1

		     A1 is REAL

	   A2

		     A2 is REAL

	   A3

		     A3 is REAL
		     On entry, A1, A2 and A3 are elements of the input 2-by-2
		     upper (lower) triangular matrix A.

	   B1

		     B1 is REAL

	   B2

		     B2 is REAL

	   B3

		     B3 is REAL
		     On entry, B1, B2 and B3 are elements of the input 2-by-2
		     upper (lower) triangular matrix B.

	   CSU

		     CSU is REAL

	   SNU

		     SNU is REAL
		     The desired orthogonal matrix U.

	   CSV

		     CSV is REAL

	   SNV

		     SNV is REAL
		     The desired orthogonal matrix V.

	   CSQ

		     CSQ is REAL

	   SNQ

		     SNQ is REAL
		     The desired orthogonal matrix Q.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 152 of file slags2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       slags2.f(3)
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