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Full Discussion: Chaining together exec within find
Top Forums Shell Programming and Scripting Chaining together exec within find Post 302999317 by Don Cragun on Friday 16th of June 2017 05:45:08 PM
Old 06-16-2017
Quote:
Originally Posted by Corona688
Since tar may be run multiple times, you need to use the append option, not the create option.

How about:

Code:
$ tar -rf archive.tar # Create empty tar file to append to

$ find testout -type f -exec echo ls -latrd '{}' ';' -exec echo tar -rvf archive.tar '{}' ';' -exec echo rm '{}' ';'

ls -latrd testout/testfile1
tar -rvf archive.tar testout/testfile1
rm testout/testfile1
ls -latrd testout/testfile2
tar -rvf archive.tar testout/testfile2
rm testout/testfile2
ls -latrd testout/testfile3
tar -rvf archive.tar testout/testfile3
rm testout/testfile3

# remove echos to actually run these commands instead of printing them

If you have GNU find, you can use + instead of ; for increased efficiency as it will bundle several files into each call:

Code:
$ find testout -type f -exec echo ls -latrd '{}' '+' -exec echo tar -rvf /absolute/path/to/archive.tar '{}' '+' -exec echo rm '{}' '+'

ls -latrd testout/testfile1 testout/testfile2 testout/testfile3
tar -rvf /absolute/path/to/archive.tar testout/testfile1 testout/testfile2 testout/testfile3
rm testout/testfile1 testout/testfile2 testout/testfile3

$

No. Do not use -exec ... + in cases like this. If there are enough files to trigger an invocation of one of these -exec primaries before the find has processed the entire file hierarchy, the list of files processed by each -exec primary is likely to have a different set of operands that the other -exec primaries. For example, the 1st invocation of ls might process 100 files, the 1st invocation of tar might process 95 files, and the 1st invocation ofrm might process 105 files. The 2nd invocations of ls and tar will then fail because the 1st invocation of rm will have removed some of the files before they were listed and archived.

If there aren't enough files in the file hierarchy being processed by find to trigger invocations of of those tree utilities until the entire file hierarchy has been traversed, all three utilities could be run in parallel again allowing rm to remove some or all of the files before they are listed and archived.
 

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