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e9a910b33c
i currently use the output of sha512sum in several places of xbmk, which is a bit unreliable in case output changes. other cases where i use util outputs in variables are probably reliable, because i'm using mostly posix utilities in those. to mitigate this, i now import suckless sbase, which has a reasonable sha512sum implementation. *every* binary it builds is being placed in build.list, because i'll probably start using more of them. for example, i may start modifying the "date" implementation, adding the GNU-specific options that i need as mentioned on init.sh i'm importing it in util/ because the sha512sum util is needed for verifying project sources, so if sbase itself is a "project source", that means we can into a chicken and egg bootstrapping problem. this is sbase at revision: 055cc1ae1b3a13c3d8f25af0a4a3316590efcd48 Signed-off-by: Leah Rowe <leah@libreboot.org>
77 lines
1.8 KiB
Groff
77 lines
1.8 KiB
Groff
.Dd October 8, 2015
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.Dt TAR 1
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.Os sbase
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.Sh NAME
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.Nm tar
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.Nd create, list or extract a tape archive
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.Sh SYNOPSIS
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.Nm
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.Cm x | Cm t | Fl x | Fl t
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.Op Fl C Ar dir
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.Op Fl J | Fl Z | Fl a | Fl j | Fl z
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.Op Fl m
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.Op Fl p
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.Op Fl f Ar file
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.Op Ar file ...
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.Nm
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.Cm c | Fl c Op Fl C Ar dir
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.Op Fl J | Fl Z | Fl a | Fl j | Fl z
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.Op Fl h
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.Ar path ...
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.Op Fl f Ar file
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.Sh DESCRIPTION
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.Nm
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is the standard file archiver.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl c Ar path ...
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Create archive from
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.Ar path .
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.It Fl C Ar dir
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Change directory to
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.Ar dir
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before beginning.
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.It Fl f Ar file
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Set
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.Ar file
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as input | output archive instead of stdin | stdout.
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If '-', stdin | stdout is used.
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.It Fl m
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Do not preserve modification time.
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.It Fl t
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List all files in the archive.
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.It Fl x
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Extract archive.
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.It Fl h
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Always dereference symbolic links while recursively traversing directories.
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.It Fl J | Fl Z | Fl a | Fl j | Fl z
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Use xz | compress | lzma | bzip2 | gzip compression or decompression.
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These utilities must be installed separately.
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Using these flags is discouraged in favour of the flexibility
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and clarity of pipes:
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.Bd -literal -offset indent
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$ bzip2 -cd archive.tar.bz2 | tar -x
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$ gzip -cd archive.tar.gz | tar -x
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.Ed
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.Bd -literal -offset indent
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$ tar -c file ... | bzip2 > archive.tar.bz2
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$ tar -c file ... | gzip2 > archive.tar.gz
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.Ed
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.El
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.Sh SEE ALSO
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.Xr ar 1 ,
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.Xr bzip2 1 ,
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.Xr gzip 1
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.Sh STANDARDS
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The
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.Nm
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utility is compliant with the UStar (Uniform Standard Tape ARchive)
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format defined in the
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.St -p1003.1-88
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specification.
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For long file paths (>99 bytes), the UStar, 'L' and 'x' header formats are
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supported for reading (to a maximum size of PATH_MAX or 255 bytes, depending on
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format), and the 'L' format is supported for writing (with unlimited path
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size).
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Link targets are limited to the UStar maximum of 100 bytes.
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