file(1) [plan9 man page]

FILE(1) 						      General Commands Manual							   FILE(1)

NAME

       file - determine file type

SYNOPSIS

       file [ file ...	]

DESCRIPTION

       File performs a series of tests on its argument files in an attempt to classify their contents by language or purpose.  If no arguments are
       given, the classification is performed on standard input.

       The file types it looks for include directory, device file, zero-filled file, empty file, Plan 9 executable, PAC audio file, cpio  archive,
       tex  dvi  file,	archive  symbol  table,  archive,  rc script, sh script, PostScript, troff output file for various devices, GIF, FAX, pic-
       file(9.6), object code, C and Alef source, assembler source, compressed files, encrypted file, English text, Plan 9 bitmap, Plan 9 subfont,
       Plan 9 font.

       If  a  file has no apparent format, file looks at the character set it uses to classify it according to ASCII, extended ASCII, Latin ASCII,
       or UTF holding one or more of the following blocks of the Unicode Standard: Extended Latin,  Greek,  Cyrillic,  Armenian,  Hebrew,  Arabic,
       Devanagari,  Bengali,  Gurmukhi,  Gujarati,  Oriya,  Tamil, Telugu, Kannada, Malayalam, Thai, Lao, Tibetan, Georgian, Japanese, Chinese, or
       Korean.

       If all else fails, file decides its input is binary.

SOURCE

       /sys/src/cmd/file.c

BUGS

       It can make mistakes, for example classifying a file of decimal data, etc. as troff(1) input.

																	   FILE(1)

TAR(1)							      General Commands Manual							    TAR(1)

NAME

       tar - archiver

SYNOPSIS

       tar key [ file ...  ]

DESCRIPTION

       Tar  saves  and	restores  file trees.  It is most often used to transport a tree of files from one system to another.  The key is a string
       that contains at most one function letter plus optional modifiers.  Other arguments to the command are names of files or directories to	be
       dumped or restored.  A directory name implies all the contained files and subdirectories (recursively).

       The function is one of the following letters:

       c      Create a new archive with the given files as contents.

       x      Extract  the named files from the archive.  If a file is a directory, the directory is extracted recursively.  Modes are restored if
	      possible.  If no file argument is given, extract the entire archive.  If the archive contains multiple entries for a file, the  lat-
	      est one wins.

       t      List all occurrences of each file in the archive, or of all files if there are no file arguments.

       r      The named files are appended to the archive.

       The modifiers are:

       v      (verbose) Print the name of each file treated preceded by the function letter.  With t, give more details about the archive entries.

       f      Use  the	next  argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for
	      keys c and r).

       u      Use the next (numeric) argument as the user id for files in the output archive.  This is only useful when moving files to a non-Plan
	      9 system.

       g      Use the next (numeric) argument as the group id for files in the output archive.

EXAMPLES

       Tar can be used to copy hierarchies thus:

	      {cd fromdir; tar c .} | {cd todir; tar x}

SOURCE

       /sys/src/cmd/tar.c

SEE ALSO

       ar(1), bundle(1), tapefs(1)

BUGS

       There is no way to ask for any but the last occurrence of a file.
       File path names are limited to 100 characters.
       The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored.

																	    TAR(1)