Linux cli command sqfscat

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command sqfscat and provides detailed information about the command sqfscat, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the sqfscat.

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NAME 🖥️ sqfscat 🖥️

tool to cat files from a squashfs filesystem to stdout

SYNOPSIS

sqfscat [OPTIONS] FILESYSTEM [list of files to cat to stdout]

DESCRIPTION

Squashfs is a highly compressed read-only filesystem for Linux. It uses either gzip/xz/lzo/lz4/zstd compression to compress both files, inodes and directories. Inodes in the system are very small and all blocks are packed to minimise data overhead. Block sizes greater than 4K are supported up to a maximum of 1Mbytes (default block size 128K).

Squashfs is intended for general read-only filesystem use, for archival use (i.e. in cases where a .tar.gz file may be used), and in constrained block device/memory systems (e.g. embedded systems) where low overhead is needed.

OPTIONS

-v, -version
print version, licence and copyright information.

-p NUMBER, -processors NUMBER
use NUMBER processors. By default will use the number of processors available.

-o BYTES, -offset 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, -ignore-errors
treat errors writing files to stdout as non-fatal.

-st, -strict-errors
treat all errors as fatal.

-no-exit, -no-exit-code
don’t set exit code (to nonzero) on non-fatal errors.

-da SIZE, -data-queue SIZE
set data queue to SIZE Mbytes. Default 256 Mbytes.

-fr SIZE, -frag-queue SIZE
set fragment queue to SIZE Mbytes. Default 256 Mbytes.

-no-wild, -no-wildcards
do not use wildcard matching in filenames.

-r, -regex
treat filenames as POSIX regular expressions rather than use the default shell wildcard expansion (globbing).

-h, -help
output options text to stdout.

DECOMPRESSORS AVAILABLE

gzip, lzo, lz4, xz, zstd, lzma

EXIT STATUS

0
The file or files were output to stdout OK.

1
FATAL errors occurred, e.g. filesystem corruption, I/O errors. Sqfscat did not continue and aborted.

2
Non-fatal errors occurred, e.g. not a regular file, or failed to resolve pathname. Sqfscat continued and did not abort.

See -ignore-errors, -strict-errors and -no-exit-code options for how they affect the exit status.

EXAMPLES

sqfscat IMAGE.SQFS hello
Output the contents of “hello” to stdout.

sqfscat IMAGE.SQFS hello world
Output the contents of “hello” and then “world” to stdout.

sqfscat IMAGE.SQFS “*.[ch]”
Output the contents of all the files in the root directory that match the wildcard *.[ch], to stdout, e.g. hello.c, hello.h, world.c, world.h.

Note: when passing wildcarded names to Sqfscat, they should be quoted (as in the above examples), to ensure that they are not processed by the shell.

AUTHOR

Written by Phillip Lougher <[email protected]>

COPYRIGHT

Copyright © 2023 Phillip Lougher <[email protected]>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

SEE ALSO

mksquashfs(1), unsquashfs(1), sqfstar(1)

The README for the Squashfs-tools 4.6.1 release, describing the new features can be read here https://github.com/plougher/squashfs-tools/blob/master/README-4.6.1

The Squashfs-tools USAGE guide can be read here https://github.com/plougher/squashfs-tools/blob/master/USAGE-4.6

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