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Full Discussion: testing if files exist
Top Forums UNIX for Dummies Questions & Answers testing if files exist Post 302184875 by era on Sunday 13th of April 2008 01:17:26 PM
Old 04-13-2008
Is your script supposed to be invoked with the files you want to process, and terminate if they don't exist? $# indicates how many arguments there were (presumably you want to abort if there were none) but to check whether the named file(s) exist, you give them as arguments to "test -f".

Code:
case $# in 0) echo no files, try again >&2 ;; esac
for f in "$@"; do
  if [ -f "$f" ] ; then
    ... handle file
  else
    echo "$0: file $f not found -- skipping" >&2
  fi
done

 

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LEARN ABOUT DEBIAN

libblas-test

BLAS-TEST(1)						     Linux Programmer's Manual						      BLAS-TEST(1)

NAME

       x{s,d,c,z}c?blat{1,2,3} - testing programs for blas

SYNOPSIS

       x{s,d,c,z}c?blat1
       x{s,d,c,z}c?blat{2,3} < parameter file

DESCRIPTION

       This  manual  page documents briefly the blas testing programs.	This manual page was written for the Debian GNU/Linux distribution because
       the original programs do not have manual pages.

       blas is a library of Basic Linear Algebra routines, accessed through either a Fortran and/or a C interface.  These routines are categorized
       into  three  levels:  level1  referring to vecotr-vector operations, level2 to matrix-vector operations, and level3 to matrix-matrix opera-
       tions.	In addition, all routines are written in four "precisions", single precision real (s), double precision real (d), cingle precision
       complex (c), and double precision complex (z).
       The  testing  binaries  examine routines in the level indicated by the last character in the program name and in the precision indicated by
       the second character in the program name.  The stem "blat" in the program name refers to a Fortran interface tester, whereas a "cblat" stem
       refers to a C interface tester.
       The  test  programs  for  levels 2 and 3 read a set of parameters specifying the problem ranges to examine on standard input.  Sample input
       files are found in /usr/share/doc/blas-test/examples.  Files of the form {s,d,c,z}in{2,3} are input files for the C interface testing  pro-
       grams, while files or the form {s,d,c,z}blat{2,3}d are input files to the Fortran testing programs.
       On  Debian  systems,  these  programs are dynamically linked against the blas library.  This enables the user to test and compare alternate
       versions of the library, such as those provided by atlas, through the use of the LD_LIBRARY_PATH and LD_PRELOAD environment variables.  One
       can confirm the versions of the libraries being tested in a given environment with the aid of the ldd program.

OPTIONS

       These programs take no command line options.

AUTHOR

       This manual page was written by Camm Maguire <camm@enhanced.com>, for the Debian GNU/Linux system (but may be used by others).

netlib								 January 29, 2002						      BLAS-TEST(1)
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