Uses an alternative magic file provided by the user.ĭoesn't pad the file names to align with the output.įlushes the output after checking each file.Īttempts to preserve the last time the file was accessed to make it look like the file command didn't test it. Shows a list of matching patterns in descending order of strength. ![]() Keeps the test going after the first results match. The list must contain only one file name per line.Ĭhanges the command output to a MIME-type string.Ĭhanges the command output to a MIME-type string and only displays the specified element (type or encoding). Uses a provided text file as a list of files to test. Uses the provided string as a separator between the file name and file type. Prints a list of valid extensions for the file type. On filesystem error, issues an error message and exits.Įxcludes a test from the list of tests performed on a file.Įxcludes tests that the file command doesn't know about. Prints internal debugging information in the standard error format. ![]() The file command uses the following options: OptionĬhanges the command output to the one used by older versions of MacOS.Ĭreates an output file that contains a pre-parsed version of the magic file or directory.Ĭhecks the printout for the parsed version of the magic file. For instance, using the file command to test a text file: file example.txt The command output provides a short description of the file and data type. Language tests use a special tag to determine which programming language a binary executable file is written in.The information needed to perform these tests is stored in /etc/magic or /usr/share/misc/magic from a compiled magic file. Magic tests use a short string of numbers stored near the beginning of the file ("magic number") to test if the file is a binary executable and, if so, determine its type. ![]() This way, the file command determines if the file is a common type for your system (such as a text file, image, directory, etc.). Filesystem tests perform a stat(2) system call and check the result against the system header file.The file command performs three sets of tests trying to determine the file type, in this order: In the syntax above, file name represents the name of the file you want to test. The file command uses the following basic syntax: file
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