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SQFSCAT - A tool to output files to stdout
Sqfscat allows you to "cat" files to STDOUT from a Squashfs filesystem
without mounting it. It can read all official Squashfs filesystems.
The Sqfscat usage info is:
SYNTAX: sqfscat [OPTIONS] FILESYSTEM [list of files to cat to stdout]
-v[ersion] print version, licence and copyright information
-p[rocessors] <number> use <number> processors. By default will use
the number of processors available
-o[ffset] <bytes> skip <bytes> at start of FILESYSTEM.
Optionally a suffix of K, M or G can be given to
specify Kbytes, Mbytes or Gbytes respectively
(default 0 bytes).
-ig[nore-errors] treat errors writing files to stdout as
non-fatal
-st[rict-errors] treat all errors as fatal
-no-exit[-code] don't set exit code (to nonzero) on non-fatal
errors
-da[ta-queue] <size> set data queue to <size> Mbytes. Default 256
Mbytes
-fr[ag-queue] <size> set fragment queue to <size> Mbytes. Default
256 Mbytes
-no-wild[cards] do not use wildcard matching in filenames
-r[egex] treat filenames as POSIX regular expressions
rather than use the default shell wildcard
expansion (globbing)
-h[elp] output options text to stdout
The pathnames of the files to be output, like cat, can contain symbolic links,
and "." and ".." elements.
Sqfscat is a short-cut to using the equivalent Unsquashfs -cat option, i.e.
the following will behave the same:
% sqfscat image.sqfs file
% unsquashfs -cat image.sqfs file
If any of the files given on the command line does not result in a regular file,
Sqfscat will throw an error, but will continue to output the remaining
files on the command line. This follows the behaviour of "cat", for example:
phillip@phoenix:/tmp$ sqfscat image.sqfs dir Hello_World
cat: /dir is a directory
Hello World!
phillip@phoenix:/tmp$ cat dir Hello_World
cat: dir: Is a directory
Hello World!
Sqfscat supports wildcards and it will output the contents of any file that
matches, e.g.
% sqfscat image.sqfs "*.[ch]"
Will output the contents of all the files in the root directory that match the
wildcard *.[ch], to stdout, for example hello.c, hello.h, world.c, world.h.
Note: when passing wildcarded names to Sqfscat, they should be quoted (as in
the above example), to ensure that they are not processed by the shell.
ERRORS and EXIT CODE
--------------------
If Sqfscat encounters fatal errors such as I/O error, filesystem corruption,
it will abort immediately, and return an exit code of 1.
If it skipped a file because it wasn't a regular file, or it wasn't in the
filesystem, it will return an exit code of 2.
Otherwise a success exit code of 0 will be returned.
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