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AR(1) GNU Development Tools AR(1)
NAME
ar - create, modify, and extract from archives
SYNOPSIS
ar [-X32_64] [-]p[mod [relpos] [count]] archive [member...]
DESCRIPTION
The GNU ar program creates, modifies, and extracts from archives. An archive is a
single file holding a collection of other files in a structure that makes it possi-
ble to retrieve the original individual files (called members of the archive).
The original files’ contents, mode (permissions), timestamp, owner, and group are
preserved in the archive, and can be restored on extraction.
GNU ar can maintain archives whose members have names of any length; however,
depending on how ar is configured on your system, a limit on member-name length may
be imposed for compatibility with archive formats maintained with other tools. If
it exists, the limit is often 15 characters (typical of formats related to a.out)
or 16 characters (typical of formats related to coff).
ar is considered a binary utility because archives of this sort are most often used
as libraries holding commonly needed subroutines.
ar creates an index to the symbols defined in relocatable object modules in the
archive when you specify the modifier s. Once created, this index is updated in
the archive whenever ar makes a change to its contents (save for the q update oper-
ation). An archive with such an index speeds up linking to the library, and allows
routines in the library to call each other without regard to their placement in the
archive.
You may use nm -s or nm --print-armap to list this index table. If an archive
lacks the table, another form of ar called ranlib can be used to add just the ta-
ble.
GNU ar is designed to be compatible with two different facilities. You can control
its activity using command-line options, like the different varieties of ar on Unix
systems; or, if you specify the single command-line option -M, you can control it
with a script supplied via standard input, like the MRI ‘‘librarian’’ program.
OPTIONS
GNU ar allows you to mix the operation code p and modifier flags mod in any order,
within the first command-line argument.
If you wish, you may begin the first command-line argument with a dash.
The p keyletter specifies what operation to execute; it may be any of the follow-
ing, but you must specify only one of them:
d Delete modules from the archive. Specify the names of modules to be deleted as
member...; the archive is untouched if you specify no files to delete.
If you specify the v modifier, ar lists each module as it is deleted.
m Use this operation to move members in an archive.
The ordering of members in an archive can make a difference in how programs are
linked using the library, if a symbol is defined in more than one member.
If no modifiers are used with "m", any members you name in the member arguments
are moved to the end of the archive; you can use the a, b, or i modifiers to
move them to a specified place instead.
p Print the specified members of the archive, to the standard output file. If
the v modifier is specified, show the member name before copying its contents
to standard output.
If you specify no member arguments, all the files in the archive are printed.
q Quick append; Historically, add the files member... to the end of archive,
without checking for replacement.
The modifiers a, b, and i do not affect this operation; new members are always
placed at the end of the archive.
The modifier v makes ar list each file as it is appended.
Since the point of this operation is speed, the archive’s symbol table index is
not updated, even if it already existed; you can use ar s or ranlib explicitly
to update the symbol table index.
However, too many different systems assume quick append rebuilds the index, so
GNU ar implements q as a synonym for r.
r Insert the files member... into archive (with replacement). This operation dif-
fers from q in that any previously existing members are deleted if their names
match those being added.
If one of the files named in member... does not exist, ar displays an error
message, and leaves undisturbed any existing members of the archive matching
that name.
By default, new members are added at the end of the file; but you may use one
of the modifiers a, b, or i to request placement relative to some existing mem-
ber.
The modifier v used with this operation elicits a line of output for each file
inserted, along with one of the letters a or r to indicate whether the file was
appended (no old member deleted) or replaced.
t Display a table listing the contents of archive, or those of the files listed
in member... that are present in the archive. Normally only the member name is
shown; if you also want to see the modes (permissions), timestamp, owner,
group, and size, you can request that by also specifying the v modifier.
If you do not specify a member, all files in the archive are listed.
If there is more than one file with the same name (say, fie) in an archive (say
b.a), ar t b.a fie lists only the first instance; to see them all, you must ask
for a complete listing---in our example, ar t b.a.
x Extract members (named member) from the archive. You can use the v modifier
with this operation, to request that ar list each name as it extracts it.
If you do not specify a member, all files in the archive are extracted.
A number of modifiers (mod) may immediately follow the p keyletter, to specify
variations on an operation’s behavior:
a Add new files after an existing member of the archive. If you use the modifier
a, the name of an existing archive member must be present as the relpos argu-
ment, before the archive specification.
b Add new files before an existing member of the archive. If you use the modi-
fier b, the name of an existing archive member must be present as the relpos
argument, before the archive specification. (same as i).
c Create the archive. The specified archive is always created if it did not
exist, when you request an update. But a warning is issued unless you specify
in advance that you expect to create it, by using this modifier.
f Truncate names in the archive. GNU ar will normally permit file names of any
length. This will cause it to create archives which are not compatible with
the native ar program on some systems. If this is a concern, the f modifier
may be used to truncate file names when putting them in the archive.
i Insert new files before an existing member of the archive. If you use the mod-
ifier i, the name of an existing archive member must be present as the relpos
argument, before the archive specification. (same as b).
l This modifier is accepted but not used.
N Uses the count parameter. This is used if there are multiple entries in the
archive with the same name. Extract or delete instance count of the given name
from the archive.
o Preserve the original dates of members when extracting them. If you do not
specify this modifier, files extracted from the archive are stamped with the
time of extraction.
P Use the full path name when matching names in the archive. GNU ar can not cre-
ate an archive with a full path name (such archives are not POSIX complaint),
but other archive creators can. This option will cause GNU ar to match file
names using a complete path name, which can be convenient when extracting a
single file from an archive created by another tool.
s Write an object-file index into the archive, or update an existing one, even if
no other change is made to the archive. You may use this modifier flag either
with any operation, or alone. Running ar s on an archive is equivalent to run-
ning ranlib on it.
S Do not generate an archive symbol table. This can speed up building a large
library in several steps. The resulting archive can not be used with the
linker. In order to build a symbol table, you must omit the S modifier on the
last execution of ar, or you must run ranlib on the archive.
u Normally, ar r... inserts all files listed into the archive. If you would like
to insert only those of the files you list that are newer than existing members
of the same names, use this modifier. The u modifier is allowed only for the
operation r (replace). In particular, the combination qu is not allowed, since
checking the timestamps would lose any speed advantage from the operation q.
v This modifier requests the verbose version of an operation. Many operations
display additional information, such as filenames processed, when the modifier
v is appended.
V This modifier shows the version number of ar.
ar ignores an initial option spelt -X32_64, for compatibility with AIX. The
behaviour produced by this option is the default for GNU ar. ar does not support
any of the other -X options; in particular, it does not support -X32 which is the
default for AIX ar.
SEE ALSO
nm(1), ranlib(1), and the Info entries for binutils.
COPYRIGHT
Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
2002, 2003, 2004 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document under the
terms of the GNU Free Documentation License, Version 1.1 or any later version pub-
lished by the Free Software Foundation; with no Invariant Sections, with no Front-
Cover Texts, and with no Back-Cover Texts. A copy of the license is included in
the section entitled ‘‘GNU Free Documentation License’’.
binutils-2.15.94.0.2.2 2005-06-29 AR(1)
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