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Sometimes, while performing the requested task, GNU
some conditions that are not exactly errors, but which the user
should be aware of. When this happens,
tar issues a
warning message describing the condition. Warning messages
are output to the standard error and they do not affect the exit
tar allows the user to suppress some or all of its warning
Control display of the warning messages identified by keyword. If keyword starts with the prefix ‘no-’, such messages are suppressed. Otherwise, they are enabled.
Multiple ‘--warning’ messages accumulate.
The tables below list allowed values for keyword along with the warning messages they control.
Enable all warning messages. This is the default.
Disable all warning messages.
‘%s: file name read contains nul character’
‘A lone zero block at %s’
‘%s: contains a cache directory tag %s; %s’
‘%s: File shrank by %s bytes; padding with zeros’
‘%s: file is on a different filesystem; not dumped’
‘%s: Unknown file type; file ignored’
‘%s: socket ignored’
‘%s: door ignored’
‘%s: file is unchanged; not dumped’
‘%s: file is the archive; not dumped’
‘%s: File removed before we read it’
‘%s: file changed as we read it’
Suppresses warnings about unreadable files or directories. This keyword applies only if used together with the ‘--ignore-failed-read’ option. See section Ignore Failed Read.
‘%s: skipping existing file’
‘%s: implausibly old time stamp %s’
‘%s: time stamp %s is %s s in the future’
‘Extracting contiguous files as regular files’
‘Attempting extraction of symbolic links as hard links’
‘%s: Unknown file type '%c', extracted as normal file’
‘Current %s is newer or same age’
‘Ignoring unknown extended header keyword '%s'’
Controls verbose description of failures occurring when trying to run alternative decompressor programs (see alternative decompression programs). This warning is disabled by default (unless ‘--verbose’ is used). A common example of what you can get when using this warning is:
$ tar --warning=decompress-program -x -f archive.Z tar (child): cannot run compress: No such file or directory tar (child): trying gzip
This means that
tar first tried to decompress
compress, and, when that
failed, switched to
‘Record size = %lu blocks’
‘%s: Directory has been renamed from %s’
‘%s: Directory has been renamed’
‘%s: Directory is new’
‘%s: directory is on a different device: not purging’
‘Malformed dumpdir: 'X' never used’
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