java qr code reader example chown USERID, GROUPID, LIST in Objective-C

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chown USERID, GROUPID, LIST
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The USERID and GROUPID are the numerical IDs of the user and group, and LIST is the list of files whose ownership you want to change For example:
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chown 1000,1000,@files;
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Like the chmod function, it returns the number of files actually changed You want to use a similar trick to the earlier chmod example if you are modifying a number of files
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Note that the user and group information must be specified numerically You may want to use the getpwnam and getgrnam functions to obtain the IDs of user and group names, as in
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chown scalar getpwnam($user), scalar getgrnam($group), @files;
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You ll see further examples of obtaining user and group information later in this chapter To modify the last access and modification time for a file, you need to use the utime function:
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utime ATIME, MTIME, LIST
The ATIME and MTIME arguments specify the access and modification times you wish to set The values should be specified as the number of seconds that have elapsed since the epoch See the section Time in 11 for details on converting between the epoch value and date format For the next example, the time specified is taken from the time function, which returns the number of seconds since the epoch at the time executed; so this script effectively emulates the Unix touch command:
$now = time; utime $now, $now, @files;
Note in this example that the time is assigned to a variable before being set This prevents two different times being set between invocations and also reduces the number of system calls If you fail to specify a value, the corresponding time for the file is not modified Like the previous two commands, the function returns the number of files that were successfully modified When creating a file using open, sysopen, or other functions, the mode of the file is determined by a combination of the mode specified and the current umask The umask is an octal permissions mask that specifies the permissions bits that cannot be set when a file is created For example, with a umask of 0077, the read, write, and execute bits for group and other users cannot be set, even if the function creating the file specifies them
umask EXPR umask
The function returns the current mode, and if you do not specify EXPR, there is no modification of any kind to the umask
Perl: The Complete Reference
Accessing Directory Entries
If you do not already know the name of the file you are trying to access, or if you want to specify a list of files but don t know where to get the list, you can use one of three methods The first is similar to the filehandle operator:
The pattern between the brackets is matched against the list of files in the current directory, or that specified within the pattern The pattern supports the standard file pattern matching of many shells on the Unix platform Users of Mac and NT platforms may be unfamiliar with these, although they follow guidelines similar to the basic pattern matching supported by Perl regular expressions The supported formats are very basic, and they only support the use of * as a wildcard for any number of characters and as a wildcard for a single character For example, to get a list of all of the files ending in c :
@files = <*c>;
Other patterns that you may be familiar with within the shell, such as braces (for multiple options) and square brackets (for a single character from a set), are not supported However, this is not a problem, since you can use the grep function (discussed in the next chapter) to select a more specific list of files You can also use the standard variable interpolation to use a scalar variable as the pattern, but don t do
@files = <$pattern>;
since Perl will assume you re referring to an indirect filehandle (one specified by a variable, rather than a static tag) Instead, either use braces to force interpretation as a file name glob,
@files = <${pattern}>;
or use the glob function, which is actually what calling the <PATTERN> operator does anyway The glob function is also clearer: it is obvious to any reader that you are trying to do a file name glob, not access a filehandle The format for the glob function is identical to the operator The earlier C source file example can be restated as
@files = glob("*c");
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