如何跟踪 X11 输出"connect /tmp/.X11-unix/X1: No such file or directory"

我想从脚本静默地测试 X11 是否正常工作。

我一直得到"连接/tmp/。X11-unix/X1：没有这样的文件或目录"，即使我将 stdout 和 stderr 重定向到/dev/null 并(例如)xset q > /dev/null 2>&1

我描摹了一下，它似乎没有被 xset 写出来。我也跟踪了相关的 sshd，它似乎也没有写它。

xset，xdpyinfo和测试程序在如何检查X服务器是否正在运行？都输出这个无用的错误消息。事实上，vim 也是如此。但"ls"没有。

我也试过：script -e -c 'xset q' /dev/null > /dev/null 2>&1...但即使这样也会输出错误消息。

我需要做什么来消除此过于激进的错误消息？

谢谢！

PS：这是xset q的痕迹：

20878 execve("/usr/bin/xset", ["xset", "q"], 0x7ffe3e91cfe0 /* 33 vars */) = 0
20878 brk(NULL)                         = 0x563d8a664000
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=141841, ...}) = 0
20878 mmap(NULL, 141841, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f19ac118000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libXmuu.so.1", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1p23"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=14528, ...}) = 0
20878 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19ac144000
20878 mmap(NULL, 2109592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19abd10000
20878 mprotect(0x7f19abd13000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19abf12000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f19abf12000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libXext.so.6", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>12205"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=73640, ...}) = 0
20878 mmap(NULL, 2169496, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19abaf8000
20878 mprotect(0x7f19abb09000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19abd08000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7f19abd08000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libX11.so.6", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>13002071"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=1277384, ...}) = 0
20878 mmap(NULL, 3374392, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19ab7c0000
20878 mprotect(0x7f19ab8f3000, 2097152, PROT_NONE) = 0
20878 mmap(0x7f19abaf3000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x133000) = 0x7f19abaf3000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF21133>1260342"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0755, st_size=2030544, ...}) = 0
20878 mmap(NULL, 4131552, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19ab3c8000
20878 mprotect(0x7f19ab5af000, 2097152, PROT_NONE) = 0
20878 mmap(0x7f19ab7af000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e7000) = 0x7f19ab7af000
20878 mmap(0x7f19ab7b5000, 15072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f19ab7b5000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libxcb.so.1", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1P261"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=162232, ...}) = 0
20878 mmap(NULL, 2257576, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19ab1a0000
20878 mprotect(0x7f19ab1c6000, 2097152, PROT_NONE) = 0
20878 mmap(0x7f19ab3c6000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7f19ab3c6000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1P16"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=14560, ...}) = 0
20878 mmap(NULL, 2109712, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aaf98000
20878 mprotect(0x7f19aaf9b000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19ab19a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f19ab19a000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libXau.so.6", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1P16"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=14456, ...}) = 0
20878 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19ac142000
20878 mmap(NULL, 2109720, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aad90000
20878 mprotect(0x7f19aad92000, 2097152, PROT_NONE) = 0
20878 mmap(0x7f19aaf92000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f19aaf92000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libXdmcp.so.6", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>12021"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=22616, ...}) = 0
20878 mmap(NULL, 2117760, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aab88000
20878 mprotect(0x7f19aab8d000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19aad8c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f19aad8c000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libbsd.so.0", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1P4"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=80104, ...}) = 0
20878 mmap(NULL, 2179152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aa970000
20878 mprotect(0x7f19aa983000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19aab82000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12000) = 0x7f19aab82000
20878 mmap(0x7f19aab84000, 80, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f19aab84000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/librt.so.1", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1""..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=31680, ...}) = 0
20878 mmap(NULL, 2128864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aa768000
20878 mprotect(0x7f19aa76f000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19aa96e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f19aa96e000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1000b"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0755, st_size=144976, ...}) = 0
20878 mmap(NULL, 2221184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aa548000
20878 mprotect(0x7f19aa562000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19aa761000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19000) = 0x7f19aa761000
20878 mmap(0x7f19aa763000, 13440, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f19aa763000
20878 close(3)                          = 0
20878 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19ac13d000
20878 mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f19ac115000
20878 arch_prctl(ARCH_SET_FS, 0x7f19ac115740) = 0
20878 mprotect(0x7f19ab7af000, 16384, PROT_READ) = 0
20878 mprotect(0x7f19aa761000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19aa96e000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19aab82000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19aad8c000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19aaf92000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19ab19a000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19ab3c6000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19abaf3000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19abd08000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19abf12000, 4096, PROT_READ) = 0
20878 mprotect(0x563d8872f000, 4096, PROT_READ) = 0
20878 mprotect(0x7f19ac13f000, 4096, PROT_READ) = 0
20878 munmap(0x7f19ac118000, 141841)    = 0
20878 set_tid_address(0x7f19ac115a10)   = 20878
20878 set_robust_list(0x7f19ac115a20, 24) = 0
20878 rt_sigaction(SIGRTMIN, {sa_handler=0x7f19aa54dcb0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f19aa55a890}, NULL, 8) = 0
20878 rt_sigaction(SIGRT_1, {sa_handler=0x7f19aa54dd50, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f19aa55a890}, NULL, 8) = 0
20878 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
20878 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
20878 brk(NULL)                         = 0x563d8a664000
20878 brk(0x563d8a685000)               = 0x563d8a685000
20878 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
20878 connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
20878 close(3)                          = 0
20878 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
20878 connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
20878 close(3)                          = 0
20878 openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=529, ...}) = 0
20878 read(3, "# /etc/nsswitch.confn#n# Example"..., 4096) = 529
20878 read(3, "", 4096)                 = 0
20878 close(3)                          = 0
20878 stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=304, ...}) = 0
20878 openat(AT_FDCWD, "/etc/host.conf", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=92, ...}) = 0
20878 read(3, "# The "order" line is only used "..., 4096) = 92
20878 read(3, "", 4096)                 = 0
20878 close(3)                          = 0
20878 futex(0x7f19ab7b7ba4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
20878 openat(AT_FDCWD, "/etc/resolv.conf", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=304, ...}) = 0
20878 read(3, "# Dynamic resolv.conf(5) file fo"..., 4096) = 304
20878 read(3, "", 4096)                 = 0
20878 close(3)                          = 0
20878 uname({sysname="Linux", nodename="zareason-limbo", ...}) = 0
20878 openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=141841, ...}) = 0
20878 mmap(NULL, 141841, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f19ac0f0000
20878 close(3)                          = 0
20878 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
20878 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 3
20878 read(3, "177ELF2113>1P#"..., 832) = 832
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=47568, ...}) = 0
20878 mmap(NULL, 2168632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f19aa330000
20878 mprotect(0x7f19aa33b000, 2093056, PROT_NONE) = 0
20878 mmap(0x7f19aa53a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f19aa53a000
20878 mmap(0x7f19aa53c000, 22328, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f19aa53c000
20878 close(3)                          = 0
20878 mprotect(0x7f19aa53a000, 4096, PROT_READ) = 0
20878 munmap(0x7f19ac0f0000, 141841)    = 0
20878 openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) = 3
20878 fstat(3, {st_mode=S_IFREG|0644, st_size=403, ...}) = 0
20878 read(3, "127.0.0.1tlocalhostn127.0.1.1tza"..., 4096) = 403
20878 read(3, "", 4096)                 = 0
20878 close(3)                          = 0
20878 socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 3
20878 setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0
20878 setsockopt(3, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
20878 connect(3, {sa_family=AF_INET, sin_port=htons(6013), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
20878 getpeername(3, {sa_family=AF_INET, sin_port=htons(6013), sin_addr=inet_addr("127.0.0.1")}, [124->16]) = 0
20878 uname({sysname="Linux", nodename="zareason-limbo", ...}) = 0
20878 access("/home/dstromberg/.Xauthority", R_OK) = 0
20878 openat(AT_FDCWD, "/home/dstromberg/.Xauthority", O_RDONLY) = 4
20878 fstat(4, {st_mode=S_IFREG|0600, st_size=827, ...}) = 0
20878 read(4, "116zareason-limbo01022MIT-MAGIC"..., 4096) = 827
20878 read(4, "", 4096)                 = 0
20878 close(4)                          = 0
20878 getsockname(3, {sa_family=AF_INET, sin_port=htons(37214), sin_addr=inet_addr("127.0.0.1")}, [124->16]) = 0
20878 fcntl(3, F_GETFL)                 = 0x2 (flags O_RDWR)
20878 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
20878 fcntl(3, F_SETFD, FD_CLOEXEC)     = 0
20878 poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
20878 writev(3, [{iov_base="lv2220", iov_len=12}, {iov_base="", iov_len=0}, {iov_base="MIT-MAGIC-COOKIE-1", iov_len=18}, {iov_base="", iov_len=2}, {iov_base="256b245317f2622525427365!H2123316J", iov_len=16}, {iov_base="", iov_len=0}], 6) = 48
20878 recvfrom(3, 0x563d8a6660e0, 8, 0, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
20878 poll([{fd=3, events=POLLIN}], 1, -1) = 1 ([{fd=3, revents=POLLIN|POLLERR|POLLHUP}])
20878 recvfrom(3, 0x563d8a6660e0, 8, 0, NULL, NULL) = -1 ECONNRESET (Connection reset by peer)
20878 shutdown(3, SHUT_RDWR)            = -1 ENOTCONN (Transport endpoint is not connected)
20878 close(3)                          = 0
20878 write(2, "xset:  unable to open display "l"..., 47) = 47
20878 exit_group(1)                     = ?
20878 +++ exited with 1 +++

这是一个类型 -a xset：

$ type -a xset
below cmd output started 2019 Sun Jun 30 07:49:33 AM PDT
xset is /usr/bin/xset

在不重定向的情况下运行，以显示消息的顺序：

$ xset q
below cmd output started 2019 Sun Jun 30 08:03:24 AM PDT
connect /tmp/.X11-unix/X1: No such file or directory
xset:  unable to open display "localhost:13.0"

为了回应melpomene的评论，我设置了一个完全没有启动文件的测试帐户。然后我 ssh -Y'd 到它，sudo'd，并收到与上述相同的错误消息。

我一直在侏儒终端上专门测试。我刚刚尝试了konsole，再次收到令人反感的错误消息。

我只是尝试跟踪openssh客户端;它产生了字符串"connect"的单次出现，它看起来不相关(除了连接到ssh服务器)。

我一直在Linux Mint 19.1系统上进行测试。我刚刚在新安装的 Debian 9.9 系统上尝试了一下，得到了相同的结果。

复制步骤：

ssh -Y remote.host.example.com
须藤巴什
xset -q>/dev/null 2>&1

在这 3 个简单步骤之后，您可能会看到有问题的错误消息。

这很容易理解和复制，但有许多活动部件。

我们 ssh 到具有 X 转发的远程机器。此 ssh 进程必须能够访问本地工作的 X 服务器。在这里，我们将以一个笑话开始$DISPLAY：

(local) $ DISPLAY=:87 ssh -Y remote
Warning: No xauth data; using fake authentication data for X11 forwarding

该Warning表明ssh无法在本地联系工作的 X 服务器。

在远程$DISPLAY上不:87

(remote) $ echo $DISPLAY
(remote) localhost:11.0

这就是ssh的-Y的魔力以及它的 X11 代理的工作原理。

我们在遥控器上运行一个命令，尝试连接到$DISPLAY：

(remote) $ xset -q
connect /tmp/.X11-unix/X99: No such file or directory
xset:  unable to open display "localhost:11.0"

这是你的问题：

(remote) $ xset -q >/dev/null 2>&1
connect /tmp/.X11-unix/X99: No such file or directory

xset正在打印unable错误消息，并已被重定向离开。但是，connect错误消息来自ssh。请记住，xset在远程上运行，当SSH在本地运行时。

在运行ssh之前，您需要在本地验证$DISPLAY。

您可以通过多种方式使ssh静音，但我不喜欢扔掉错误消息。一种方法是减少错误冗长：

(local) $ DISPLAY=:87 ssh -Y -o LogLevel=FATAL remote 'xset -q &>/dev/null'

有关ssh设置的列表，请参阅man ssh_config。

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