Aplicando os comandos chmod e chown dinamicamente na saída do comando find

Question

Eu tenho um arquivo dentro de muitos diretórios de dentro de um diretório raiz. Eu preciso aplicar o comando chmod 640 e chown em todos os arquivos. Eu tenho dois comandos, um para encontrar os caminhos de arquivo e o outro é aplicar o chmod e o chown. Como posso aplicar o chmod e chown na saída do comando find

Exemplo:

find . -type f -name 'myawesomeapp.jar'

chmod 640 /path/to/file/myawesomeapp.jar
chown root:webapps /path/to/file/myawesomeapp.jar

chmod 640 /path/to/another/file/myawesomeapp.jar
chown root:webapps /path/to/another/file/myawesomeapp.jar

    

Answer 1

Use o sinalizador -exec de find para executar comandos nos resultados:

find . -type f -name 'myawesomeapp.jar' -exec chmod 640 {} \+ -exec chown root:webapps {} \+

No seu caso, você quer usar a segunda variante do exec:

-exec command ;
    Execute command; true if 0 status is returned.  All following  argu‐
    ments  to  find  are  taken  to be arguments to the command until an
    argument consisting of ';'  is  encountered.   The  string  '{}'  is
    replaced  by  the  current  file  name being processed everywhere it
    occurs in the arguments to the command, not just in arguments  where
    it  is  alone, as in some versions of find.  Both of these construc‐
    tions might need to be escaped (with a '\')  or  quoted  to  protect
    them  from  expansion  by  the  shell.  See the EXAMPLES section for
    examples of the use of the -exec option.  The specified  command  is
    run  once  for  each  matched  file.  The command is executed in the
    starting directory.   There are unavoidable security  problems  sur‐
    rounding use of the -exec action; you should use the -execdir option
    instead.

-exec command {} +
    This variant of the -exec action runs the specified command  on  the
    selected  files,  but  the  command  line is built by appending each
    selected file name at the end; the total number  of  invocations  of
    the command will be much less than the number of matched files.  The
    command line is built in much the same way  that  xargs  builds  its
    command lines.  Only one instance of '{}' is allowed within the com‐
    mand.  The command is executed in the starting directory.   If  find
    encounters  an error, this can sometimes cause an immediate exit, so
    some pending commands may not be run at all.  This variant of  -exec
    always returns true.

{} é o token de substituição para os nomes de arquivos que serão transmitidos em find .

    

Answer 2

tee clone o pipe e xargs alimenta cada comando com argumentos:

find -name 'myawesomeapp.jar' -print0 | tee >(xargs -0 chown root:webapps) | xargs -0 chmod 640