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Full Discussion: Recursive directory search using ls instead of find
Top Forums UNIX for Advanced & Expert Users Recursive directory search using ls instead of find Post 302536923 by alister on Wednesday 6th of July 2011 01:37:43 PM
Old 07-06-2011
Hi, newreverie:

Welcome to the forum.

I'd be interested in seeing to what that shell script is comparitively blazingly fast. I'm inclined to believe that your find solution was suboptimal if that shell script, executing those pipelines for each visited directory, is faster.

If you are not familiar with AWK, you might enjoy the challenge of learning enough of it to simplify the egrep|sed|cut|head|tail pipeline to one concise AWK invocation.

Performance and efficiency aside, there are some potentially serious issues with that code. One that stands out: if a directory is deleted between the time $numdirectories is calculated and the subsequent while loop concludes, entire subtrees of the hierarchy will be visited more than once (a result of the input to head being shorter than expected). Depending on what's being done with each of the files, this could be deal breaker.

Again, welcome to the forum and thanks for the contribution.

Regards,
Alister
 

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LEARN ABOUT NETBSD

shar

SHAR(1) 						    BSD General Commands Manual 						   SHAR(1)

NAME

     shar -- create a shell archive of files

SYNOPSIS

     shar file ...

DESCRIPTION

     shar writes an sh(1) shell script to the standard output which will recreate the file hierarchy specified by the command line operands.
     Directories will be recreated and must be specified before the files they contain (the find(1) utility does this correctly).

     shar is normally used for distributing files by ftp(1) or mail(1).

EXAMPLES

     To create a shell archive of the program ls(1) and mail it to Rick:

	   cd ls
	   shar `find . -print` |  mail -s "ls source" rick

     To recreate the program directory:

	   mkdir ls
	   cd ls
	   ...
	   <delete header lines and examine mailed archive>
	   ...
	   sh archive

SEE ALSO

     compress(1), mail(1), tar(1), uuencode(1)

HISTORY

     The shar command appeared in 4.4BSD.

BUGS

     shar makes no provisions for special types of files or files containing magic characters.

SECURITY CONSIDERATIONS

     It is easy to insert trojan horses into shar files.  It is strongly recommended that all shell archive files be examined before running them
     through sh(1).  Archives produced using this implementation of shar may be easily examined with the command:

	   egrep -v '^[X#]' shar.file

BSD
								   June 6, 1993 							       BSD
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