77 lines
2.5 KiB
Groff
77 lines
2.5 KiB
Groff
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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.37.1.
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.TH ZUPDATE "1" "September 2013" "Zupdate (zutils) 1.2-pre2" "User Commands"
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.SH NAME
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Zupdate \- recompress bzip2, gzip, xz files to lzip files
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.SH SYNOPSIS
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.B zupdate
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[\fIoptions\fR] [\fIfiles\fR]
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.SH DESCRIPTION
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Zupdate recompresses files from bzip2, gzip, and xz formats to lzip format.
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The originals are compared with the new files and then deleted.
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Only regular files with standard file name extensions are recompressed,
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other files are ignored.
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Compressed files are decompressed and then recompressed on the fly; no
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temporary files are created.
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The lzip format is chosen as destination because it is by far the most
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appropriate for long\-term data archiving.
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.PP
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If the lzip compressed version of a file already exists, the file is
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skipped unless the '\-\-force' option is given. In this case, if the
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comparison fails, an error is returned and the original file is not
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deleted. The operation of zupdate is meant to be safe and not produce
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any data loss. Therefore, existing lzip compressed files are never
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overwritten nor deleted.
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.PP
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Exit status is 0 if all the compressed files were successfully
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recompressed (if needed), compared and deleted. Non\-zero otherwise.
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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display this help and exit
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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output version information and exit
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.TP
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\fB\-f\fR, \fB\-\-force\fR
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do not skip a file even if the .lz exists
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.TP
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\fB\-l\fR, \fB\-\-lzip\-verbose\fR
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pass a \fB\-v\fR option to the lzip compressor
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.TP
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\fB\-N\fR, \fB\-\-no\-rcfile\fR
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don't read runtime configuration file
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.TP
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\fB\-q\fR, \fB\-\-quiet\fR
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suppress all messages
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.TP
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\fB\-r\fR, \fB\-\-recursive\fR
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operate recursively on directories
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.TP
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\fB\-v\fR, \fB\-\-verbose\fR
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be verbose (a 2nd \fB\-v\fR gives more)
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.TP
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\fB\-0\fR .. \fB\-9\fR
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set compression level [default 9]
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.TP
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\fB\-\-bz2=\fR<command>
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set compressor and options for bzip2 format
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.TP
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\fB\-\-gz=\fR<command>
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set compressor and options for gzip format
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.TP
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\fB\-\-lz=\fR<command>
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set compressor and options for lzip format
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.TP
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\fB\-\-xz=\fR<command>
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set compressor and options for xz format
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.SH "REPORTING BUGS"
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Report bugs to zutils\-bug@nongnu.org
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.br
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Zutils home page: http://www.nongnu.org/zutils/zutils.html
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.SH COPYRIGHT
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Copyright \(co 2013 Antonio Diaz Diaz.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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.br
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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