02-27-2018
Hi cero,
The file magic file is used to identify things like executable file formats (that have certain fixed binary values at fixed locations in a file). It is great for various a.out files, music files, photographic files, PDF files, word processing files, spreadsheet files, and similar things with fixed headers.
The file utility uses other built-in knowledge when trying to identify the language or codeset used in a text file. It sounds like the Linux file utility has some code built-in that does a better job of guessing at codesets underlying a text file than the AIX file utility for the files that JeanM-1 is processing. Whether or not the GNU file utility source would build correctly on AIX is something JeanM-1 may want to investigate. But, copying a Linux magic file to AIX and having the AIX file utility use it instead of AIX's default magic file isn't likely to make any difference for this issue.
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file(1B) SunOS/BSD Compatibility Package Commands file(1B)
NAME
file - determine the type of a file by examining its contents
SYNOPSIS
/usr/ucb/file [-f ffile] [-cL] [-m mfile] filename...
DESCRIPTION
file performs a series of tests on each filename in an attempt to determine what it contains. If the contents of a file appear to be
ASCII text, file examines the first 512 bytes and tries to guess its language.
file uses the file /etc/magic to identify files that have some sort of magic number, that is, any file containing a numeric or string con-
stant that indicates its type.
OPTIONS
-c Check for format errors in the magic number file. For reasons of efficiency, this validation is not normally carried out.
No file type-checking is done under -c.
-f ffile Get a list of filenames to identify from ffile.
-L If a file is a symbolic link, test the file the link references rather than the link itself.
-m mfile Use mfile as the name of an alternate magic number file.
EXAMPLES
Example 1: Using file on all the files in a specific user's directory.
This example illustrates the use of file on all the files in a specific user's directory:
example% pwd
/usr/blort/misc
example% /usr/ucb/file *
code: mc68020 demand paged executable
code.c: c program text
counts: ascii text
doc: roff,nroff, or eqn input text
empty.file: empty
libz: archive random library
memos: directory
project: symboliclink to /usr/project
script: executable shell script
titles: ascii text
s5.stuff: cpio archive
example%
ENVIRONMENT VARIABLES
The environment variables LC_CTYPE, LANG, and LC_default control the character classification throughout file. On entry to file, these
environment variables are checked in the following order: LC_CTYPE, LANG, and LC_default. When a valid value is found, remaining environ-
ment variables for character classification are ignored. For example, a new setting for LANG does not override the current valid character
classification rules of LC_CTYPE. When none of the values is valid, the shell character classification defaults to the POSIX.1 "C"
locale.
FILES
/etc/magic
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
magic(4), attributes(5)
BUGS
file often makes mistakes. In particular, it often suggests that command files are C programs.
file does not recognize Pascal or LISP.
SunOS 5.10 14 Sep 1992 file(1B)