Initialize file name bash shell - Linux Post: 303026646

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Top Forums Shell Programming and Scripting Initialize file name bash shell - Linux Post 303026646 by Don Cragun on Saturday 1st of December 2018 02:07:48 AM

12-01-2018

Registered User

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).

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LEARN ABOUT CENTOS

bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)