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Full Discussion: Creating a condition on a bash script
Top Forums Shell Programming and Scripting Creating a condition on a bash script Post 303005299 by Don Cragun on Tuesday 17th of October 2017 12:35:44 AM
Old 10-17-2017
What Scrutinizer suggested will work if your "file with DNA" is a UNIX formatted text file that contains zero or more lines where each line contains a DNA string of zero or more characters.

If the files contain a single DNA string with no terminating <newline> character (which is what is specified in post #1), you'll need something more like:
Code:
#!/bin/bash
IAm=${0##*/}
tmpfile="$IAm.$$"
trap 'rm -f "$tmpfile"' 0
if ! tr -d 'acgt' < "$1" > "$tmpfile" || [ -s "$tmpfile" ]
then	printf 'File "%s" is not a DNA file.  Exiting.\n' "$1" >&2
	exit 1
fi
printf 'File "%s" is a DNA file.  Continuing...\n' "$1"
# Do whatever you want to do with the specified DNA file...

This script requires one operand that is a pathname of the file you want to test.
 

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LEARN ABOUT HPUX

tmpfile

tmpfile(3S)															       tmpfile(3S)

NAME

       tmpfile() - create a temporary file

SYNOPSIS

DESCRIPTION

       creates	a temporary file by generating a name through (see tmpnam(3S)), and returns a corresponding pointer.  If the file cannot be opened
       a NULL pointer is returned.  The file is automatically deleted when the process using it terminates.  The file is opened for update

   Notes
       On HP-UX systems, the mode is equivalent to the mode.

ERRORS

       The function will fail if:

	      [EOVERFLOW]	       The named file is a regular file and the size of the file cannot be represented correctly in an	object	of
				       size in this environment.

       Additional values may be set by the underlying function (see fopen(3S)).

SEE ALSO

       creat(2), unlink(2), mktemp(3C), fopen(3S), fgetpos64(3S), tmpnam(3S), thread_safety(5).

STANDARDS CONFORMANCE

																       tmpfile(3S)
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