SQFSCAT(1) User Commands SQFSCAT(1) 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 (de- fault 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 de- fault 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. Sqfs- cat did not continue and aborted. 2 Non-fatal errors occurred, e.g. not a regular file, or failed to re- solve 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 <phillip@squashfs.org.uk> COPYRIGHT Copyright (C) 2023 Phillip Lougher <phillip@squashfs.org.uk> This program is free software; you can redistribute it and/or modify it un- der the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later ver- sion. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FIT- NESS 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 fea- tures can be read here https://github.com/plougher/squashfs-tools/blob/mas- ter/README-4.6.1 The Squashfs-tools USAGE guide can be read here https://github.com/plougher/squashfs-tools/blob/master/USAGE-4.6 sqfscat version 4.6.1 August 2026 SQFSCAT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DECOMPRESSORS AVAILABLE | EXIT STATUS | EXAMPLES | AUTHOR | COPYRIGHT | SEE ALSO
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