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Reference
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File::CheckTree
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This module provides a mechanism for validating a series of files using the standard built-in tests for files The method is to call the validate function with a textual list of files and tests, for example,
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use File::CheckTree; $errors += validate(q{ /test/testc /test/testo /test/test });
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-e || die "Can't find testc" -e || warn "Object file not found" -ex || warn
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Appendix B:
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The preceding tests that the testc file exists; a failure will cause a call to die Warnings are produced if the object and executable do not exist, and also if the executable is not actually executable The default method is to produce a warning (effectively, || warn) if a file is not specified Note that the files must be specified exactly See the File::Find module for another alternative You can also use a method of cd, which indicates the following entries are within the specified directory Thus, the preceding example could be rewritten:
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use File::CheckTree; $errors += validate(q{ /test testc testo test });
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-e || die "Can't find testc" -e || warn "Object file not found" -ex || warn
In all cases, providing a fatal error has not occurred, the return value is the number of files that failed the test
Reference
See File::Find
File::Compare
This module compares files or filehandles
use File::Compare;
To compare files, you use the compare function:
print "Equal\n" if (compare('f1','f2) == 0);
Either argument to the function can be a file name or filehandle The function returns zero if the files are equal, 1 otherwise, or 1 if an error was encountered
APPENDIXES
File::Copy
This module copies or moves files or filehandles
use File::Copy;
Perl: The Complete Reference
It supports two functions: copy and move The copy function accepts two arguments and copies from the first to the second file Either argument can be a file name or filehandle The following examples are valid:
copy('f1', 'f2'); copy(\*STDIN, 'console'); copy('f1', \*STDOUT);
The move function will move a file from one location to another:
move('f1', 'f2');
If possible, it will rename the file; but if this does not work, the contents will be copied to the new file, and the old file will be deleted when the copy is complete Both functions are platform independent and return 1 on success, 0 on failure
Reference
See Shell
File::DosGlob
This module provides a DOS-like globbing functionality, with the addition that wildcards are supported in directory and file names
require 5004; use File::DosGlob qw/glob/;
Note that this function overrides the CORE function within the scope of the current package To override the function in all packages:
use File::DosGlob qw/GLOBAL_glob/;
You can use spaces to separate individual patterns within the file specification given, for example,
$executables = glob('*exe *com');
Note that in all cases you may have to double the backslashes in file specifications to override the normal parsing that Perl does on quoted strings Alternatively, use the q// operator
Reference
8
Appendix B:
Standard Perl Library
File::Find
This module supports the traversal of a directory tree
use File::Find;
It supports two functions: find and finddepth The find function accepts at least two arguments:
find(\&wanted, '/foo', '/bar');
The first argument is a reference to a subroutine called each time a file is found This is called the wanted function and is used to process each file as it is found Further arguments specify the individual directories to traverse Because the wanted function is called each time a file is found, the function can perform whatever functions or verifications on each file it needs to The $File::Find::dir variable contains the name of the current directory Note that the function calls chdir to change into each found directory The special $_ variable contains the current file name You can also access $File::Find::name to get the full pathname of the current file Setting the value of $File::Find::prune prunes the directory tree For example, the script that follows would print files and directories in the /usr/local tree that are executable by the real and effective uid/gid:
use File::Find; find(\&wanted, '/usr/local'); sub wanted { next unless (-x $_ and -X _); print "$File::Find::name\n"; }
If you are creating complex wanted functions and know how to use the Unix find command, you can use the find2perl script, which generates the necessary stand-alone code for you For example,
$ find2perl /usr/local -name "*html" -mtime -7
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