Initialize file name bash shell - Linux Post: 303026661

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Top Forums Shell Programming and Scripting Initialize file name bash shell - Linux Post 303026661 by Geneanalyst on Saturday 1st of December 2018 07:56:21 AM

12-01-2018

Registered User

Quote:

Originally Posted by Don Cragun

What you have looks like it would try to change a file named FILE_1000G.vcf to instead have the literal name $filename_1000G.vcf assuming that the only file in the directory where you run this script is named FILE_1000G.vcf.

As you know, shell variable expansions are not expanded when $variable_name appears inside single quotes. And, if your system has a rename utility, it probably won't be happy with operands that do not contain the string you're trying to replace. (I know of several systems that have a rename() function in C; but I don't have access to any that have a rename utility.) So, in case your system does have a rename utility that does what I'm guessing you're trying to do, you might want to try:

Code:

set -e
echo 'Please enter your name:'
read username
rename "s/FILE/$username/" *FILE*

Assuming that you're using a POSIX conforming shell (which you have not specified), and using just standard utilities, you might want to try something more like:

Code:

echo "Please enter your name:"
read username
for filename in *FILE*
do    if [ -f "$filename" ]
    then    prefix=${filename%%FILE*}
        suffix=${filename#*FILE}
        mv "$filename" "$prefix$username$suffix"
    fi
done

This should work in any directory containing zero or more regular files with filenames that contain the literal string FILE one or more times (replacing only the first occurrence of FILE if FILE appears more than once in a filename).

Thanks Don, I liked your 1st code, just learned something!

Geneanalyst

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LEARN ABOUT V7

fopen

FOPEN(3S)																 FOPEN(3S)

NAME

       fopen, freopen, fdopen - open a stream

SYNOPSIS

       #include <stdio.h>

       FILE *fopen(filename, type)
       char *filename, *type;

       FILE *freopen(filename, type, stream)
       char *filename, *type;
       FILE *stream;

       FILE *fdopen(fildes, type)
       char *type;

DESCRIPTION

       Fopen  opens the file named by filename and associates a stream with it.  Fopen returns a pointer to be used to identify the stream in sub-
       sequent operations.

       Type is a character string having one of the following values:

       "r"  open for reading

       "w"  create for writing

       "a"  append: open for writing at end of file, or create for writing

       Freopen substitutes the named file in place of the open stream.	It returns the original value of stream.  The original stream is closed.

       Freopen is typically used to attach the preopened constant names, stdin, stdout, stderr, to specified files.

       Fdopen associates a stream with a file descriptor obtained from open, dup, creat, or pipe(2).  The type of the stream must agree  with  the
       mode of the open file.

SEE ALSO

       open(2), fclose(3)

DIAGNOSTICS

       Fopen and freopen return the pointer NULL if filename cannot be accessed.

BUGS

       Fdopen is not portable to systems other than UNIX.

																	 FOPEN(3S)