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Full Discussion: While loop a file containing list of file names until the files are found?
Top Forums Shell Programming and Scripting While loop a file containing list of file names until the files are found? Post 302942118 by rbatte1 on Friday 24th of April 2015 10:58:53 AM
Old 04-24-2015
Could I throw in a totally different suggestion? If you have a WANTED file with the required names and all the files should be in a single directory, could you follow this logic?:-
  • List all files in the directory
  • Use your WANTED file with grep to generate a list of all files that do exist.
  • Use grep again to check those still missing.
Something like this perhaps:-
Code:
WANTED=/tmp/my_file_list
cd $Directory
missing=1
until [ $missing -eq 0 ]
do
   ls -1 | grep -f $WANTED > /tmp/current
   missing=`grep -cvf /tmp/current $WANTED`
   sleep 7200
done

printf "All files have arrived."

It might mean fewer reads of the directory, although it does generate an intermediate file, so maybe, maybe not. There also might be confusion if your files are too similarly named, e.g. FileA arrives, but FileA1 is still missing, and this might not be spotted. You might need to mark the beginning and end of each line in the WANTED file with ^ & $ respectively.

Just an alternate option to theorise on perhaps.



Robin
 

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LEARN ABOUT DEBIAN

prename

RENAME(1)						 Perl Programmers Reference Guide						 RENAME(1)

NAME

       rename - renames multiple files

SYNOPSIS

       rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]

DESCRIPTION

       "rename" renames the filenames supplied according to the rule specified as the first argument.  The perlexpr argument is a Perl expression
       which is expected to modify the $_ string in Perl for at least some of the filenames specified.	If a given filename is not modified by the
       expression, it will not be renamed.  If no filenames are given on the command line, filenames will be read via standard input.

       For example, to rename all files matching "*.bak" to strip the extension, you might say

	       rename 's/.bak$//' *.bak

       To translate uppercase names to lower, you'd use

	       rename 'y/A-Z/a-z/' *

OPTIONS

       -v, --verbose
	       Verbose: print names of files successfully renamed.

       -n, --no-act
	       No Action: show what files would have been renamed.

       -f, --force
	       Force: overwrite existing files.

ENVIRONMENT

       No environment variables are used.

AUTHOR

       Larry Wall

SEE ALSO

       mv(1), perl(1)

DIAGNOSTICS

       If you give an invalid Perl expression you'll get a syntax error.

BUGS

       The original "rename" did not check for the existence of target filenames, so had to be used with care.	I hope I've fixed that (Robin
       Barker).

perl v5.14.2							    2014-09-26								 RENAME(1)
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