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$ which [
/usr/bin/[

$ strace [
execve("/usr/bin/[", ["["], [/* 78 vars */]) = 0
uname({sys="Linux", node="semo", ...})  = 0
brk(0)                                  = 0x804f000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=89324, ...}) = 0
mmap2(NULL, 89324, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f0b000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0200\213"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1201624, ...}) = 0
mmap2(0x4989e000, 1141980, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x4989e000
madvise(0x4989e000, 1141980, MADV_SEQUENTIAL|0x1) = 0
mmap2(0x499af000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x110) = 0x499af000
mmap2(0x499b3000, 7388, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x499b3000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0a000
mprotect(0x499af000, 4096, PROT_READ)   = 0
mprotect(0x4989a000, 4096, PROT_READ)   = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f0aa90, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7f0b000, 89324)               = 0
open("/dev/urandom", O_RDONLY)          = 3
read(3, "b\\\300\"", 4)                 = 4
close(3)                                = 0
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or directory)
brk(0)                                  = 0x804f000
brk(0x8070000)                          = 0x8070000
open("/usr/share/locale/locale.alias", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=2586, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7eea000
read(3, "# Locale name alias data base.\n#"..., 131072) = 2586
read(3, "", 131072)                     = 0
close(3)                                = 0
munmap(0xb7eea000, 131072)              = 0
open("/usr/lib/locale/en_US/LC_IDENTIFICATION", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=378, ...}) = 0
mmap2(NULL, 378, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f20000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_MEASUREMENT", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=28, ...}) = 0
mmap2(NULL, 28, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1f000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_TELEPHONE", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=64, ...}) = 0
mmap2(NULL, 64, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1e000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_ADDRESS", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=160, ...}) = 0
mmap2(NULL, 160, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1d000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_NAME", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=82, ...}) = 0
mmap2(NULL, 82, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1c000
close(3)                                = 0
open("/usr/lib/locale/sk_SK/LC_PAPER", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=39, ...}) = 0
mmap2(NULL, 39, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1b000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_MESSAGES", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=57, ...}) = 0
mmap2(NULL, 57, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f1a000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_MONETARY", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=291, ...}) = 0
mmap2(NULL, 291, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f19000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_COLLATE", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=21499, ...}) = 0
mmap2(NULL, 21499, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f13000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_TIME", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=2456, ...}) = 0
mmap2(NULL, 2456, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f12000
close(3)                                = 0
open("/usr/lib/locale/en_US/LC_NUMERIC", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=59, ...}) = 0
mmap2(NULL, 59, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f11000
close(3)                                = 0
open("/usr/lib/locale/sk_SK/LC_CTYPE", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=178464, ...}) = 0
mmap2(NULL, 178464, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7ede000
close(3)                                = 0
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "[: ", 3[: )                      = 3
write(2, "missing `]\'\n", 12missing `]'
)          = 12
close(1)                                = 0
exit_group(2)                           = ?
Process 387 detached