Define함수    에러코드   메세지
                 0      Success
EPERM            1      Operation not permitted
ENOENT           2      No such file or directory
ESRCH            3      No such process
EINTR            4      Interrupted system call
EIO              5      I/O error
ENXIO            6      No such device or address
E2BIG            7      Arg list too long
ENOEXEC          8      Exec format error
EBADF            9      Bad file number
ECHILD          10      No child processes
EAGAIN          11      Try again
ENOMEM          12      Out of memory
EACCES          13      Permission denied
EFAULT          14      Bad address
ENOTBLK         15      Block device required
EBUSY           16      Device or resource busy
EEXIST          17      File exists
EXDEV           18      Cross-device link
ENODEV          19      No such device
ENOTDIR         20      Not a directory
EISDIR          21      Is a directory
EINVAL          22      Invalid argument
ENFILE          23      File table overflow
EMFILE          24      Too many open files
ENOTTY          25      Not a typewriter
ETXTBSY         26      Text file busy
EFBIG           27      File too large
ENOSPC          28      No space left on device
ESPIPE          29      Illegal seek
EROFS           30      Read-only file system
EMLINK          31      Too many links
EPIPE           32      Broken pipe
EDOM            33      Math argument out of domain of func
ERANGE          34      Math result not representable
EDEADLK         35      Resource deadlock would occur
ENAMETOOLONG    36      File name too long
ENOLCK          37      No record locks available
ENOSYS          38      Function not implemented
ENOTEMPTY       39      Directory not empty
ELOOP           40      Too many symbolic links encountered
EWOULDBLOCK     EAGAIN  Operation would block
ENOMSG          42      No message of desired type
EIDRM           43      Identifier removed
ECHRNG          44      Channel number out of range
EL2NSYNC        45      Level 2 not synchronized
EL3HLT          46      Level 3 halted
EL3RST          47      Level 3 reset
ELNRNG          48      Link number out of range
EUNATCH         49      Protocol driver not attached
ENOCSI          50      No CSI structure available
EL2HLT          51      Level 2 halted
EBADE           52      Invalid exchange
EBADR           53      Invalid request descriptor
EXFULL          54      Exchange full
ENOANO          55      No anode
EBADRQC         56      Invalid request code
EBADSLT         57      Invalid slot
EBFONT          59      Bad font file format
ENOSTR          60      Device not a stream
ENODATA         61      No data available
ETIME           62      Timer expired
ENOSR           63      Out of streams resources
ENONET          64      Machine is not on the network
ENOPKG          65      Package not installed
EREMOTE         66      Object is remote
ENOLINK         67      Link has been severed
EADV            68      Advertise error
ESRMNT          69      Srmount error
ECOMM           70      Communication error on send
EPROTO          71      Protocol error
EMULTIHOP       72      Multihop attempted
EDOTDOT         73      RFS specific error
EBADMSG         74      Not a data message
EOVERFLOW       75      Value too large for defined data type
ENOTUNIQ        76      Name not unique on network
EBADFD          77      File descriptor in bad state
EREMCHG         78      Remote address changed
ELIBACC         79      Can not access a needed shared library
ELIBBAD         80      Accessing a corrupted shared library
ELIBSCN         81      .lib section in a.out corrupted
ELIBMAX         82      Attempting to link in too many shared libraries
ELIBEXEC        83      Cannot exec a shared library directly
EILSEQ          84      Illegal byte sequence
ERESTART        85      Interrupted system call should be restarted
ESTRPIPE        86      Streams pipe error
EUSERS          87      Too many users
ENOTSOCK        88      Socket operation on non-socket
EDESTADDRREQ    89      Destination address required
EMSGSIZE        90      Message too long
EPROTOTYPE      91      Protocol wrong type for socket
ENOPROTOOPT     92      Protocol not available
EPROTONOSUPPORT 93      Protocol not supported
ESOCKTNOSUPPORT 94      Socket type not supported
EOPNOTSUPP      95      Operation not supported on transport endpoint
EPFNOSUPPORT    96      Protocol family not supported
EAFNOSUPPORT    97      Address family not supported by protocol
EADDRINUSE      98      Address already in use
EADDRNOTAVAIL   99      Cannot assign requested address
ENETDOWN        100     Network is down
ENETUNREACH     101     Network is unreachable
ENETRESET       102     Network dropped connection because of reset
ECONNABORTED    103     Software caused connection abort
ECONNRESET      104     Connection reset by peer
ENOBUFS         105     No buffer space available
EISCONN         106     Transport endpoint is already connected
ENOTCONN        107     Transport endpoint is not connected
ESHUTDOWN       108     Cannot send after transport endpoint shutdown
ETOOMANYREFS    109     Too many references: cannot splice
ETIMEDOUT       110     Connection timed out
ECONNREFUSED    111     Connection refused
EHOSTDOWN       112     Host is down
EHOSTUNREACH    113     No route to host
EALREADY        114     Operation already in progress
EINPROGRESS     115     Operation now in progress
ESTALE          116     Stale NFS file handle
EUCLEAN         117     Structure needs cleaning
ENOTNAM         118     Not a XENIX named type file
ENAVAIL         119     No XENIX semaphores available
EISNAM          120     Is a named type file
EREMOTEIO       121     Remote I/O error
EDQUOT          122     Quota exceeded
ENOMEDIUM       123     No medium found
EMEDIUMTYPE     124     Wrong medium type
ECANCELED       125     Operation Cancelled
ENOKEY          126     Required key not available
EKEYEXPIRED     127     Key has expired
EKEYREVOKED     128     Key has been revoked
EKEYREJECTED    129     Key was rejected by service

echo $? 명령어를 이용한 이전 실행 명령어의 상태값 확인

에러코드0 - Success

에러코드1 - Operation not permitted

에러코드2 - No such file or directory