NAME

file - Manipulate file names and attributes

SYNOPSIS

file option name ?arg arg ...?

DESCRIPTION

This command provides several operations on a file's name or attributes. Name is the name of a file; if it starts with a tilde, then tilde substitution is done before executing the command (see the manual entry for filename for details). Option indicates what to do with the file name. Any unique abbreviation for option is acceptable. The valid options are:

file atime name
Returns a decimal string giving the time at which file name was last accessed. The time is measured in the standard POSIX fashion as seconds from a fixed starting time (often January 1, 1970). If the file doesn't exist or its access time cannot be queried then an error is generated.
file dirname name
Returns a name comprised of all of the path components in name excluding the last element. If name is a relative file name and only contains one path element, then returns ``.'' (or ``:'' on the Macintosh). If name refers to a root directory, then the root directory is returned. For example,
file executable name
Returns 1 if file name is executable by the current user, 0 otherwise. Under UNIX this command uses the real user and group identifiers, not the effective ones.
file exists name
Returns 1 if file name exists and the current user has search privileges for the directories leading to it, 0 otherwise.
file extension name
Returns all of the characters in name after and including the last dot in the last element of name. If there is no dot in the last element of name then returns the empty string.
file isdirectory name
Returns 1 if file name is a directory, 0 otherwise.
file isfile name
Returns 1 if file name is a regular file, 0 otherwise.
file join name ?name ...?
Takes one or more file names and combines them, using the correct path separator for the current platform. If a particular name is relative, then it will be joined to the previous file name argument. Otherwise, any earlier arguments will be discarded, and joining will proceed from the current argument. For example,
file lstat name varName
Same as stat option (see below) except uses the lstat kernel call instead of stat. This means that if name refers to a symbolic link the information returned in varName is for the link rather than the file it refers to. On systems that don't support symbolic links this option behaves exactly the same as the stat option.
file mtime name
Returns a decimal string giving the time at which file name was last modified. The time is measured in the standard POSIX fashion as seconds from a fixed starting time (often January 1, 1970). If the file doesn't exist or its modified time cannot be queried then an error is generated.
file owned name
Returns 1 if file name is owned by the current user, 0 otherwise.
file pathtype name
Returns one of absolute, relative, volumerelative. If name refers to a specific file on a specific volume, the path type will be absolute. If name refers to a file relative to the current working directory, then the path type will be relative. If name refers to a file relative to the current working directory on a specified volume, or to a specific file on the current working volume, then the file type is volumerelative.
file readable name
Returns 1 if file name is readable by the current user, 0 otherwise. Under UNIX this command uses the real user and group identifiers, not the effective ones.
file readlink name
Returns the value of the symbolic link given by name (i.e. the name of the file it points to). If name isn't a symbolic link or its value cannot be read, then an error is returned. On systems that don't support symbolic links this option is undefined.
file rootname name
Returns all of the characters in name up to but not including the last ``.'' character in the last component of name. If the last component of name doesn't contain a dot, then returns name.
file size name
Returns a decimal string giving the size of file name in bytes. If the file doesn't exist or its size cannot be queried then an error is generated.
file split name
Returns a list whose elements are the path components in name. The first element of the list will have the same path type as name. All other elements will be relative. Path separators will be discarded unless they are needed ensure that an element is unambiguously relative. For example, under Unix
file stat name varName
Invokes the stat kernel call on name, and uses the variable given by varName to hold information returned from the kernel call. VarName is treated as an array variable, and the following elements of that variable are set: atime, ctime, dev, gid, ino, mode, mtime, nlink, size, type, uid. Each element except type is a decimal string with the value of the corresponding field from the stat return structure; see the manual entry for stat for details on the meanings of the values. The type element gives the type of the file in the same form returned by the command file type. This command returns an empty string.
file tail name
Returns all of the characters in name after the last directory separator. If name contains no separators then returns name.
file type name
Returns a string giving the type of file name, which will be one of file, directory, characterSpecial, blockSpecial, fifo, link, or socket.
file writable name
Returns 1 if file name is writable by the current user, 0 otherwise. Under UNIX this command uses the real user and group identifiers, not the effective ones.

SEE ALSO

filename

KEYWORDS

attributes, directory, file, name, stat 
Copyright © 1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995, 1996 Roger E. Critchlow Jr.