root@LEDE:~# strace echo -e "test"
execve("/opt/bin/echo", ["echo", "-e", "test"], 0x7f982fb8 /* 17 vars */) = 0
brk(NULL)                               = 0xa8a000
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x77654000
access("/opt/etc/ld.so.preload", R_OK)  = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/opt/lib/tls/libm.so.6", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat64("/opt/lib/tls", 0x7fa42cd8)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/opt/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\220j\0\0004\0\0\0"..., 512) = 512
_llseek(3, 648, [648], SEEK_SET)        = 0
read(3, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\3\0\0\0\2\0\0\0\0\0\0\0", 32) = 32
fstat64(3, {st_mode=S_IFREG|0755, st_size=1013280, ...}) = 0
mmap2(NULL, 1061936, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x77522000
mprotect(0x77615000, 61440, PROT_NONE)  = 0
mmap2(0x77624000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf2000) = 0x77624000
close(3)                                = 0
openat(AT_FDCWD, "/opt/lib/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\340(\0\0004\0\0\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=95288, ...}) = 0
mmap2(NULL, 153760, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x774fc000
mprotect(0x77512000, 61440, PROT_NONE)  = 0
mmap2(0x77521000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x77521000
mprotect(0x7fa43000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC|PROT_GROWSDOWN) = 0
close(3)                                = 0
openat(AT_FDCWD, "/opt/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0\204\235\1\0004\0\0\0"..., 512) = 512
_llseek(3, 792, [792], SEEK_SET)        = 0
read(3, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\3\0\0\0\2\0\0\0\0\0\0\0", 32) = 32
fstat64(3, {st_mode=S_IFREG|0755, st_size=1652528, ...}) = 0
mmap2(NULL, 1626288, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7736e000
mprotect(0x774e3000, 61440, PROT_NONE)  = 0
mmap2(0x774f2000, 28672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x174000) = 0x774f2000
mmap2(0x774f9000, 8368, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x774f9000
close(3)                                = 0
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x77652000
set_thread_area(0x776594a0)             = 0
mprotect(0x774f2000, 16384, PROT_READ)  = 0
mprotect(0x77624000, 4096, PROT_READ)   = 0
mprotect(0x77659000, 4096, PROT_READ)   = 0
prctl(PR_SET_NAME, "echo")              = 0
getuid()                                = 0
brk(NULL)                               = 0xa8a000
brk(0xaab000)                           = 0xaab000
write(1, "test\n", 5test
)                   = 5
exit_group(0)                           = ?
+++ exited with 0 +++