Exit & Error Codes in bash and Linux OS

bash and Linux OS provides an error code on encountering failure or exist status code. As a numeric code is displayed it is for the user to understand and act on that error code. find the ready reference to the exit codes and error codes  with their meaning to help debug the issues faster.

BASH Exit Status

Exit Status Code





failure, as defined by the program


command line usage error


BASH Error Codes & their Meaning 

Error Code  Error  comment
1 catch all error code  errors such as divide by 0 or operations not permitted.
2 Misuse of shell builtins (according to Bash documentation) Missing Keyword, command or Permission
126 Command invoked cannot execute Missing execute permissions
127  Command not found command does not exit in the PATH or wrong command name
128 Invalid argument to exit valid range is from 0 to 255
‘128+n’ Fatal error signal “n” Process killed by -9 signal will return 128+9 131 as error code
130 Script terminated by Control-C Control C was pressed 
255 Exit status out of range  Status is not defined, not any of the known status 

Linux OS Error Numbers, Error Codes and Meaning 

Unix and Linux OS  shows  error code and error name at time time of failures  which may not be clear 

The table below provides a quick reference to error numbers, error name and their meaning to help in troubleshooting.

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




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