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Full Discussion: revision of copy script to allow for single quote
Top Forums Shell Programming and Scripting revision of copy script to allow for single quote Post 302707387 by LMHmedchem on Friday 28th of September 2012 01:06:39 PM
Old 09-28-2012
revision of copy script to allow for single quote
I have the following script that I use to copy a list of files from one dir to another,
Code:
#!/usr/bin/bash
# $1=filename of file with the list of files to copy
# $2=column header for col in list file with filenames (filePath in most cases)
# $3=src dir
# $3=destination dir

FILE_LIST="$1"
FILE_FIELD="$2"
SOURCE_DIR="$3"
DEST_DIR="$4"

if [ $# -ne 4 ]
then
   echo "usage: $0 file_list field src_dir dest_dir" >&2
   exit 1
fi
if [ ! -f "$FILE_LIST" ]
then
    echo "Invalid filelist $FILE_LIST">&2
    exit 2
fi
# create destination directory if it doesnt' exist
if [ ! -d "$DEST_DIR" ]
then
    mkdir $DEST_DIR
fi
if [ ! -d "$SOURCE_DIR" ]
then
    echo "Invalid source directory">&2
    exit 4
fi
 
awk -vS="$SOURCE_DIR" -vFLD="$FILE_FIELD" 'NR==1{for(i=1;i<=NF;i++)if($i==FLD)w=i;next}
w {print S "/" $w}' $FILE_LIST | xargs  -r cp --target-directory="$DEST_DIR"

This reads the list of file names from a column in a text file and then copies those files from the src dir to the target dir.

I have run into a problem as some of my file names contain single quotes and I am getting an xargs error,

"xargs: unmatched single quote; by default quotes are special to xargs unless you use the -0 option"

I tried adding -0, but I got an error that the argument line was too long. I don't know xargs well enough to know exactly which arguments I need, or if I need to use a different approach to the script. The filenames will never have spaces or double quotes, but may have . , ' - _ ~ ( ) [ ] { } < >

I appreciate the assistance as there are often a lot of files and no good solution in the absence of a script.

LMHmedchem
 

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LEARN ABOUT FREEBSD

service

SERVICE(8)						    BSD System Manager's Manual 						SERVICE(8)

NAME

     service -- control (start/stop/etc.) or list system services

SYNOPSIS

     service -e
     service -R
     service [-v] -l | -r
     service [-v] <rc.d script> start|stop|etc.

DESCRIPTION

     The service command is an easy interface to the rc.d system.  Its primary purpose is to start and stop services provided by the rc.d scripts.
     When used for this purpose it will set the same restricted environment that is in use at boot time (see below).  It can also be used to list
     the scripts using various criteria.

     The options are as follows:

     -e  List services that are enabled.  The list of scripts to check is compiled using rcorder(8) the same way that it is done in rc(8), then
	 that list of scripts is checked for an "rcvar" assignment.  If present the script is checked to see if it is enabled.

     -R  Restart all enabled local services.

     -l  List all files in /etc/rc.d and the local startup directories.  As described in rc.conf(5) this is usually /usr/local/etc/rc.d.  All
	 files will be listed whether they are an actual rc.d script or not.

     -r  Generate the rcorder(8) as in -e above, but list all of the files, not just what is enabled.

     -v  Be slightly more verbose

ENVIRONMENT

     When used to run rc.d scripts the service command sets HOME to / and PATH to /sbin:/bin:/usr/sbin:/usr/bin which is how they are set in
     /etc/rc at boot time.

EXIT STATUS

     The service utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     The following are examples of typical usage of the service command:

	   service named status
	   service -rv

     The following programmable completion entry can be use in bash(1) for the names of the rc.d scripts:
	   _service () {
		local cur
		cur=${COMP_WORDS[COMP_CWORD]}
		COMPREPLY=( $( compgen -W '$( service -l )' -- $cur ) )
		return 0
	   }
	   complete -F _service service

SEE ALSO

     bash(1) (ports/shells/bash), rc.conf(5), rc(8), rcorder(8)

HISTORY

     The service utility first appeared in FreeBSD 7.3.

AUTHORS

     This manual page was written by Douglas Barton <dougb@FreeBSD.org>.

BSD
								 December 11, 2012							       BSD
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