Archive Extraction Warnings (GNU tar 1.35)

#### 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`’