3.9.3 Keywords applicable for tar --extract

The following keywords control warnings that can be issued during archive extraction.

warning: existing-file

‘%s: skipping existing file’

warning: timestamp

‘%s: implausibly old time stamp %s’
‘%s: time stamp %s is %s s in the future’

warning: contiguous-cast

‘Extracting contiguous files as regular files’

warning: symlink-cast

‘Attempting extraction of symbolic links as hard links’, warning message ‘Attempting extraction of symbolic links as hard links’

warning: unknown-cast

‘%s: Unknown file type '%c', extracted as normal file’

warning: ignore-newer

‘Current %s is newer or same age’

warning: unknown-keyword

‘Ignoring unknown extended header keyword '%s'’

warning: decompress-program

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 ‘archive.Z’ using compress, and, when that failed, switched to gzip.

warning: record-size

‘Record size = %lu blocks’

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