diff --git a/gnu/usr.bin/tar/tar.1 b/gnu/usr.bin/tar/tar.1 index 60fd20a91fa0..f8c1c0193561 100644 --- a/gnu/usr.bin/tar/tar.1 +++ b/gnu/usr.bin/tar/tar.1 @@ -11,27 +11,27 @@ .Dt TAR 1 .Sh NAME .Nm tar -.Nd -tape archiver; manipulate "tar" archive files +.Nd "tape archiver; manipulate ""tar"" archive files" .Sh SYNOPSIS .Nm .Op [-] Ns Ar bundled-options Ar Args .Op Ar gnu-style-flags -.Oo -.Ar filenames | Fl C Ar directory-name -.Oc ... +.Op Ar filenames | Fl C Ar directory-name +.Ar ... .Sh DESCRIPTION .Nm Tar is short for -.Dq tape archiver, +.Dq tape archiver , so named for historical reasons; the .Nm program creates, adds files to, or extracts files from an archive file in -.Dq tar +.Nm format, called a .Ar tarfile . -A tarfile is often a magnetic tape, but can be a floppy diskette or any +A +.Ar tarfile +is often a magnetic tape, but can be a floppy diskette or any regular disk file. .Pp The first argument word of the @@ -46,13 +46,25 @@ it must contain exactly one function letter from the set .Cm t , .Cm u , .Cm x , -for append, create, difference, replace, table of contents, update, and -extract (further described below). The command word can also contain other -function modifiers described below, some of which will take arguments from -the command line in the order they are specified in the command word (review -the EXAMPLES section). Functions and function modifiers can also be specified +for +.Em append , +.Em create , +.Em difference , +.Em replace , +.Em table of contents , +.Em update , +and +.Em extract +(further described below). +The command word can also contain other function modifiers described below, +some of which will take arguments from the command line in the order they +are specified in the command word (review the +.Sx EXAMPLES +section). +Functions and function modifiers can also be specified with the GNU argument convention (preceded by two dashes, one function or -modifier per word. Command-line arguments that specify files to +modifier per word. +Command-line arguments that specify files to add to, extract from, or list from an archive may be given as shell pattern matching strings. .Sh FUNCTIONS @@ -62,13 +74,16 @@ Exactly one of the following functions must be specified. .It Fl A .It Fl -catenate .It Fl "-concatenate" -Append the contents of named file, which must itself be a tar archive, +Append the contents of named file, which must itself be a +.Nm +archive, to the end of the archive (erasing the old end-of-archive block). This has the effect of adding the files contained in the named file to the first archive, rather than adding the second archive as an element of the first. -.Em Note: -This option requires a rewritable tarfile, +.Em Note : +This option requires a rewritable +.Ar tarfile , and therefore does not work on quarter-inch cartridge tapes. .It Fl c .It Fl -create @@ -80,26 +95,32 @@ to it. Find differences between files in the archive and corresponding files in the file system. .It Fl -delete -Delete named files from the archive (Does not work on quarter-inch tapes). +Delete named files from the archive. +(Does not work on quarter-inch tapes). .It Fl r .It Fl -append -Append files to the end of an archive (Does not work on quarter-inch tapes). +Append files to the end of an archive. +(Does not work on quarter-inch tapes). .It Fl t .It Fl -list -List the contents of an archive; if filename arguments are given, only those +List the contents of an archive; if +.Ar filename +arguments are given, only those files are listed, otherwise the entire table of contents is listed. .It Fl u .It Fl -update Append the named files if the on-disk version has a modification date -more recent than their copy in the archive (if any). Does not work on -quarter-inch tapes. +more recent than their copy in the archive (if any). +Does not work on quarter-inch tapes. .It Fl x .It Fl -extract .It Fl -get -Extract files from an archive. The owner, modification time, and file -permissions are restored, if possible. If no +Extract files from an archive. +The owner, modification time, and file permissions are restored, if possible. +If no .Ar file -arguments are given, extract all the files in the archive. If a +arguments are given, extract all the files in the archive. +If a .Ar filename argument matches the name of a directory on the tape, that directory and its contents are extracted (as well as all directories under that directory). @@ -112,7 +133,8 @@ command above), the last one extracted will overwrite all earlier versions. The other options to .Nm may be combined arbitrarily; single-letter options may be bundled in with -the command word. Verbose options which take arguments will be +the command word. +Verbose options which take arguments will be followed by the argument; single-letter options will consume successive command line arguments (see the .Sx EXAMPLES @@ -133,7 +155,9 @@ Sets the block size for reading or writing to * 512-byte blocks. .It Fl B .It Fl -read-full-blocks -Re-assemble short reads into full blocks (for reading 4.2BSD pipes). +Re-assemble short reads into full blocks (for reading +.Bx 4.2 +pipes). .It Fl C Ar directory .It Fl -directory Ar directory Change to @@ -141,11 +165,17 @@ Change to before processing the remaining arguments. .It Fl -checkpoint Print number of buffer reads/writes while reading/writing the archive. -.It Fl f Ar [hostname:]file -.It Fl -file Ar [hostname:]file +.It Fl f Xo +.Oo Ar hostname : Oc Ns Ar file +.Xc +.It Fl -file Xo +.Oo Ar hostname : Oc Ns Ar file +.Xc Read or write the specified .Ar file -(default is /dev/rsa0). If a +(default is +.Pa /dev/rsa0 ) . +If a .Ar hostname is specified, .Nm @@ -153,10 +183,12 @@ will use .Xr rmt 8 to read or write the specified .Ar file -on a remote machine. "-" may be used is a filename, for reading +on a remote machine. +.Dq Ar - +may be used as a filename, for reading or writing to/from stdin/stdout. .It Fl -force-local -Archive file is local even if it has a colon +Archive file is local even if it has a colon. .It Fl F Ar file .It Fl -info-script Ar file .It Fl -new-volume-script Ar file @@ -235,10 +267,12 @@ Extract files to standard output. Extract all protection information. .It Fl -preserve Has the effect of -.Fl p s. +.Fl p s . .It Fl P .It Fl -absolute-paths -Don't strip leading `/' from file names. +Don't strip leading +.Ql / +from file names. .It Fl R .It Fl -record-number Show record number within archive with each message. @@ -252,7 +286,9 @@ List of names to extract is sorted to match archive. Show directories which were omitted while processing the archive. .It Fl S .It Fl -sparse -Handle "sparse" files efficiently. +Handle +.Dq sparse +files efficiently. .It Fl T Ar file .It Fl I Ar file .It Fl -files-from Ar file @@ -263,10 +299,10 @@ one per line. Modifies behavior of .Fl T to expect null-terminated names; disables -.Fl C. +.Fl C . .It Fl -totals Prints total bytes written with -.Fl -create. +.Fl -create . .It Fl U .It Fl -unlink .It Fl -unlink-first @@ -278,7 +314,7 @@ Lists files written to archive with or extracted with .Fl -extract; lists file protection information along with file names with -.Fl -list. +.Fl -list . .It Fl V Ar volume-name .It Fl -label Ar volume-name Create archive with the given @@ -317,11 +353,15 @@ Filter the archive through .Ar program (which must accept .Fl d -to mean ``decompress''). +to mean +.Dq decompress ) . .It Fl -block-compress Block the output of compression program for tapes or floppies (otherwise writes will be of odd length, which device drivers may reject). -.It Fl [0-7][lmh] +.It Fl Xo +.Op Cm 0 Ns - Ns Cm 7 Ns +.Op Cm lmh +.Xc Specify tape drive and density. .El .Sh ENVIRONMENT @@ -332,11 +372,16 @@ can hold a set of default options for These options are interpreted first and can be overwritten by explicit command line parameters. .Sh EXAMPLES -To create an archive on tape drive /dev/rsa0 with a block size of 20 -blocks, containing files named "bert" and "ernie", you can enter -.Dl tar cfb /dev/rsa0 20 bert ernie +To create an archive on tape drive +.Pa /dev/rsa0 +with a block size of 20 blocks, containing files named +.Pa bert +and +.Pa ernie , +you can enter +.Dl "tar cfb /dev/rsa0 20 bert ernie" or -.Dl tar\ --create\ --file\ /dev/rsa0\ --block-size\ 20\ bert\ ernie +.Dl "tar --create --file /dev/rsa0 --block-size 20 bert ernie" Note that the .Fl f and @@ -344,13 +389,16 @@ and flags both require arguments, which they take from the command line in the order they were listed in the command word. .Pp -Because /dev/rsa0 is the default device, and 20 is the default block +Because +.Pa /dev/rsa0 +is the default device, and 20 is the default block size, the above example could have simply been -.Dl tar c bert ernie +.Dl "tar c bert ernie" .Pp To extract all the C sources and headers from an archive named -"backup.tar", type -.Dl tar xf backup.tar '*.[ch]' +.Pa backup.tar , +type +.Dl "tar xf backup.tar '*.[ch]'" Note that the pattern must be quoted to prevent the shell from attempting to expand it according the files in the current working directory (the shell does not have access to the list of files in @@ -361,38 +409,60 @@ To move file hierarchies, use a command line like this: tar -cf - -C srcdir . | tar xpf - -C destdir .Ed .Pp -To create a compressed archive on diskette, using gzip, use a command-line like -.Dl tar --block-compress -z -c -v -f /dev/fd1a -b 36 tar/ +To create a compressed archive on diskette, using +.Xr gzip 1 , +use a command-line like +.Dl "tar --block-compress -z -c -v -f /dev/fd1a -b 36 tar/" .Pp -Note that you cannot mix bundled flags and --style flags; you can use +Note that you cannot mix bundled flags and +.Fl -style +flags; you can use single-letter flags in the manner above, rather than having to type -.Dl tar --block-compress --gzip --verbose --file /dev/fd1a --block-size 20 tar/ +.Dl "tar --block-compress --gzip --verbose --file /dev/fd1a --block-size 20 tar/" .Pp The above-created diskette can be listed with -.Dl tar tvfbz /dev/fd1a 36 +.Dl "tar tvfbz /dev/fd1a 36" .Pp -To join two tar archives into a single archive, use -.Dl tar Af archive1.tar archive2.tar -which will add the files contained in archive2.tar onto the end of -archive1.tar (note that this can't be done by simply typing -.Dl cat archive2.tar >> archive1.tar -because of the end-of-file block at the end of a tar archive). +To join two +.Nm +archives into a single archive, use +.Dl "tar Af archive1.tar archive2.tar" +which will add the files contained in +.Pa archive2.tar +onto the end of +.Pa archive1.tar +(note that this can't be done by simply typing +.Dl "cat archive2.tar >> archive1.tar" +because of the end-of-file block at the end of a +.Nm +archive). .Pp -To archive all files from the directory srcdir, which were modified +To archive all files from the directory +.Pa srcdir , +which were modified after Feb. 9th 1997, 13:00 h, use -.Dl tar\ -c\ -f\ backup.tar\ --newer-mtime\ 'Feb\ 9\ 13:15\ 1997'\ srcdir/ +.Dl "tar -c -f backup.tar --newer-mtime 'Feb 9 13:15 1997' srcdir/" .Pp -Other possible time specifications are '02/09/97 13:15', -\&'1997-02-09 13:15', '13:15 9 Feb 1997', '9 Feb 1997 13:15', -\&'Feb. 9, 1997 1:15pm', '09-Feb', '3 weeks ago' or 'May first Sunday'. -To specify the correct time zone use either e.g. `13:15 CEST' or `13:15+200'. - +Other possible time specifications are +.Sq "02/09/97 13:15" , +.Sq "1997-02-09 13:15" , +.Sq "13:15 9 Feb 1997" , +.Sq "9 Feb 1997 13:15" , +.Sq "Feb. 9, 1997 1:15pm" , +.Sq "09-Feb" , +.Sq "3 weeks ago" +or +.Sq "May first Sunday" . +To specify the correct time zone use either e.g.\& +.Sq "13:15 CEST" +or +.Sq "13:15+200" . .Sh ENVIRONMENT The .Nm program examines the following environment variables. .Bl -tag -width "POSIXLY_CORRECT" -.It POSIXLY_CORRECT +.It Ev POSIXLY_CORRECT Normally, .Nm will process flag arguments that appear in the file list. @@ -400,12 +470,17 @@ If set in the environment, this causes .Nm to consider the first non-flag argument to terminate flag processing, as per the POSIX specification. -.It SHELL +.It Ev SHELL In interactive mode, a permissible response to the prompt is to -request to spawn a subshell, which will be "/bin/sh" unless the SHELL variable -is set. -.It TAPE -Changes tar's default tape drive (which is still overridden by the +request to spawn a subshell, which will be +.Pa /bin/sh +unless the +.Ev SHELL +variable is set. +.It Ev TAPE +Changes +.Nm Ns 's +default tape drive (which is still overridden by the .Fl f flag). .El @@ -414,36 +489,48 @@ flag). .It Pa /dev/rsa0 The default tape drive. .El -.\" This next request is for sections 1, 6, 7 & 8 only -.\" (command return values (to shell) and fprintf/stderr type diagnostics) -.\" .Sh DIAGNOSTICS .Sh COMPATIBILITY The .Fl y -is a FreeBSD localism. -The GNU tar maintainer has now choosen +is a +.Fx +localism. +The GNU +.Nm +maintainer has now choosen .Fl j -as the offical bzip2 compression option in GNU tar 1.13.18 and later. +as the offical +.Xr bzip2 1 +compression option in GNU +.Nm +1.13.18 and later. The .Fl I -option is for compatibility with Solaris's tar. +option is for compatibility with Solaris's +.Nm . .Sh SEE ALSO .Xr bzip2 1 , .Xr compress 1 , .Xr gzip 1 , .Xr pax 1 , .Xr rmt 8 -.\" .Sh STANDARDS .Sh HISTORY -The tar format has a rich history, dating back to Sixth Edition UNIX. +The +.Nm +format has a rich history, dating back to Sixth Edition +.Ux . The current implementation of .Nm is the GNU implementation, which -originated as the public-domain tar written by John Gilmore. +originated as the public-domain +.Nm +written by +.An John Gilmore . .Sh AUTHORS .An -nosplit -A cast of thousands, including [as listed in the ChangeLog file in the -source] +A cast of thousands, including [as listed in the +.Pa ChangeLog +file in the source] .An John Gilmore (author of original public domain version), .An Jay Fenlason @@ -463,11 +550,14 @@ release. .Sh BUGS The .Fl C -feature does not work like historical tar programs, and is probably -untrustworthy. +feature does not work like historical +.Nm +programs, and is probably untrustworthy. .Pp The .Fl A -command should work to join an arbitrary number of tar archives +command should work to join an arbitrary number of +.Nm +archives together, but it does not; attempting to do so leaves the end-of-archive blocks in place for the second and subsequent archives.