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+.TH MKSACFS 8
+.SH NAME
+mksacfs \- make a compressed file system
+.SH SYNOPSIS
+.B disk/mksacfs
+.RB [ -u ]
+.RB [ -b
+.IR blocksize ]
+.RB [ -o
+.IR file ]
+.I source
+.SH DESCRIPTION
+.I Mksacfs
+copies files from the file tree
+.I source
+(default
+.BR . )
+to a the
+.IR sacfs (4)
+file system archive
+.IR file .
+.PP
+The files and directory structure are divided into
+.I blocksize
+(default
+.BR 4096 )
+byte blocks.
+Larger blocks make large files more compact but take longer to access.
+.I Blocksize
+must be at least 116.
+If
+.B -u
+is given, the blocks are not compressed.
+Otherwise each block is compressed using an efficient compression algorithm.
+.SH SOURCE
+.B /sys/src/cmd/disk/sacfs/mksacfs.c
+.SH "SEE ALSO"
+.IR sacfs (4)