我下载了OctoPi并在我的本地文件系统（EXT4）中解压缩了该文件：
$ unzip 2014-09-09-wheezy-octopi-0.10.0.zip
只有一个文件被解压缩：
-rwxrwxr-x 1 user user 3276800000 Oct 27 14:46 2014-09-09-wheezy-octopi-0.10.0.img
现在我想将图像用于SD卡，但即使 cat 文件也会写错误（现在以root用户身份，我之前尝试过用户）：
# cat 2014-09-09-wheezy-octopi-0.10.0.img
cat: 2014-09-09-wheezy-octopi-0.10.0.img: Operation not permitted
我尝试将其解压缩到另一个位置（不同的fs，USB记忆棒），但它具有相同的行为。 我也试过了这个：
# strace cat 2014-09-09-wheezy-octopi-0.10.0.img
execve("/bin/cat", ["cat", "2014-09-09-wheezy-octopi-0.10.0."...], [/* 27 vars */]) = 0
brk(0) = 0x718000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fb2a65000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=166255, ...}) = 0
mmap(NULL, 166255, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1fb2a3c000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\37\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1844160, ...}) = 0
mmap(NULL, 3949184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1fb2480000
mprotect(0x7f1fb263a000, 2097152, PROT_NONE) = 0
mmap(0x7f1fb283a000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1ba000) = 0x7f1fb283a000
mmap(0x7f1fb2840000, 17024, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1fb2840000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fb2a3b000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fb2a39000
arch_prctl(ARCH_SET_FS, 0x7f1fb2a39740) = 0
mprotect(0x7f1fb283a000, 16384, PROT_READ) = 0
mprotect(0x60b000, 4096, PROT_READ) = 0
mprotect(0x7f1fb2a67000, 4096, PROT_READ) = 0
munmap(0x7f1fb2a3c000, 166255) = 0
brk(0) = 0x718000
brk(0x739000) = 0x739000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=3165552, ...}) = 0
mmap(NULL, 3165552, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1fb217b000
close(3) = 0
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 1), ...}) = 0
open("2014-09-09-wheezy-octopi-0.10.0.img", O_RDONLY) = -1 EPERM (Operation not permitted)
write(2, "cat: ", 5cat: ) = 5
write(2, "2014-09-09-wheezy-octopi-0.10.0."..., 352014-09-09-wheezy-octopi-0.10.0.img) = 35
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1fb2a64000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2570
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f1fb2a64000, 4096) = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpacsudo k/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, ": Operation not permitted", 25: Operation not permitted) = 25
write(2, "\n", 1
) = 1
close(1) = 0
close(2) = 0
exit_group(1) = ?
+++ exited with 1 +++
在不同的系统上（仅检查一个）我能够阅读它。
我有最新更新的Kubuntu 14.10 x64。 Linux mycomp 3.16.0-28-generic＃38-Ubuntu SMP Fri Dec 12 17:37:40 UTC 2014 x86_64 x86_64 x86_64 GNU / Linux
实际上我是通过管道写的（它有效）：
unzip -p ... | pv | dd ...
但我想知道，文件无法读取的原因以及错误的地方。
...
后来我和rapsbian有相同的经历：
wget -O 2014-12-24-wheezy-raspbian.zip http://downloads.raspberrypi.org/raspbian_latest
答案 0 :(得分：0)
重命名
mv 2014-09-09-wheezy-octopi-0.10.0.img initrd.gz
然后解压缩