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Shell Script Error Codes

>ExampleComments1Catchall for general errorslet "var1 = 1/0"Miscellaneous errors, such as "divide by zero" and bash if exit code other impermissible operations2Misuse of shell builtins (according

Bash If Exit Code Not 0

to Bash documentation)empty_function() {}Missing keyword or command, or permission problem (and diff return

Shell Script Error Handling

code on a failed binary file comparison).126Command invoked cannot execute/dev/nullPermission problem or command is not an executable127"command

Bash Script Exit On Error

not found"illegal_commandPossible problem with $PATH or a typo128Invalid argument to exitexit 3.14159exit takes only integer args in the range 0 - 255 (see first footnote)128+nFatal error signal "n"kill -9 $PPID of script$? returns shell script exit on error 137 (128 + 9)130Script terminated by Control-CCtl-CControl-C is fatal error signal 2, (130 = 128 + 2, see above)255*Exit status out of rangeexit -1exit takes only integer args in the range 0 - 255

According to the above table, exit codes 1 - 2, 126 - 165, and 255 [1] have special meanings, and should therefore be avoided for user-specified exit parameters. Ending a script with exit 127 would certainly cause confusion when troubleshooting (is the error code a "command not found" or a user-defined one?). However, many scripts use an exit 1 as a general bailout-upon-error. Since exit code 1 signifies so many possible errors, it is not particularly useful in debugging.

There has been an attempt to systematize exit status numbers (see /usr/include/sysexits.h), but this is intended for C and C++ programmers. A s

Ramey

The exit command terminates a script, just as in a C bash catch error program. It can also return a value, which is available to the linux kernel error codes script's parent process.

Every command returns an exit status (sometimes referred to as a bash not equal return status or exit code). A successful command returns a 0, while an unsuccessful one returns a non-zero value that usually can http://www.tldp.org/LDP/abs/html/exitcodes.html be interpreted as an error code. Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script itself return an exit status. The last command executed in the function or script determines the exit status. Within a script, http://www.tldp.org/LDP/abs/html/exit-status.html an exit nnn command may be used to deliver an nnn exit status to the shell (nnn must be an integer in the 0 - 255 range).

When a script ends with an exit that has no parameter, the exit status of the script is the exit status of the last command executed in the script (previous to the exit).

#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit

The equivalent of a bare exit is exit $? or even just omitting the exit.

#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit $?

#!/bin/bash COMMAND1 . . . COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command executed.

Aug 2004 on RedHat 7.3 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5 /* I/O http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html error */ #define ENXIO 6 /* No such device or address */ #define E2BIG 7 /* Arg list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 https://www.dssw.co.uk/blog/2012-10-08-how-to-add-error-checking-to-your-shell-scripts/ /* No child processes */ #define EAGAIN 11 /* Try again */ #define ENOMEM 12 /* Out of memory */ #define EACCES 13 /* Permission denied */ #define EFAULT 14 /* Bad address */ #define ENOTBLK 15 /* Block device required shell script */ #define EBUSY 16 /* Device or resource busy */ #define EEXIST 17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV 19 /* No such device */ #define ENOTDIR 20 /* Not a directory */ #define EISDIR 21 /* Is a directory */ #define EINVAL 22 /* Invalid argument */ #define ENFILE 23 /* File table overflow */ #define EMFILE 24 /* Too many open files */ #define ENOTTY 25 /* Not a typewriter */ #define ETXTBSY shell script error 26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC 28 /* No space left on device */ #define ESPIPE 29 /* Illegal seek */ #define EROFS 30 /* Read-only file system */ #define EMLINK 31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math argument out of domain of func */ #define ERANGE 34 /* Math result not representable */ #define EDEADLK 35 /* Resource deadlock would occur */ #define ENAMETOOLONG 36 /* File name too long */ #define ENOLCK 37 /* No record locks available */ #define ENOSYS 38 /* Function not implemented */ #define ENOTEMPTY 39 /* Directory not empty */ #define ELOOP 40 /* Too many symbolic links encountered */ #define EWOULDBLOCK EAGAIN /* Operation would block */ #define ENOMSG 42 /* No message of desired type */ #define EIDRM 43 /* Identifier removed */ #define ECHRNG 44 /* Channel number out of range */ #define EL2NSYNC 45 /* Level 2 not synchronized */ #define EL3HLT 46 /* Level 3 halted */ #define EL3RST 47 /* Level 3 reset */ #define ELNRNG 48 /* Link number out of range */ #define EUNATCH 49 /* Protocol driver not attached */ #define ENOCSI 50 /* No CSI structure available */ #define EL2HLT 51 /* Level 2 halted */ #define EBADE 52 /* Invalid exchange */ #define EBADR 53 /* Invalid request descriptor */ #define EXFULL 54

article shows how to add error checking to highlight problems you might otherwise miss. Access the shell on Mac via the Terminal.app Unlike more recently designed languages, shell script does not have an easy answer for error handling. There are no common exception handling routines or ways of wrapping up large blocks of script and asking for errors to fall through to a provided subroutine. Instead shell script asks you, the author, to check individual program exit codes and branch as needed in case of an error. In practice, this means your once short script is going to get a little longer and a little more involved. Unix Exit Status Each program you run through a shell script returns an exit status. This numeric status value tells the calling script if the program completed successfully or if an error was encountered. The exit status is not visible on the command line. This makes it difficult to tell if something went wrong just by looking at the textual output of a shell script. It is possible - even common - for scripts to print nothing and yet encounter multiple errors. Let's consider this simple script: #!/bin/sh cp /Volumes/Documents/criticalfile.txt /Volumes/BackUp/. This script does one thing; it copies a single file from one volume to another using the cp program. Thankfully the cp program is chatty and will print a message if an error is encountered. That is great for us reviewing the output visually, but for the shell running our script the error will go completely unnoticed. This is a problem if our script goes on to do more work, or if we want the script to robustly deal with errors. Let's add error checking to this simple script. #!/bin/sh cp /Volumes/Documents/criticalfile.txt /Volumes/BackUp/. if [ "$?" != "0" ]; then echo "[Error] copy failed!" 1>&2 exit 1 fi We have added an if/fi block below the cp line. The new block checks the special variable $? to see if it equals 0 or not. Unix programs should return 0 if they completed successfully. Any other value means something went wrong. The exact meaning of the returned value is frequently documented in the program's man page. If an error is detected in our script's if/fi block, then a message is printed and the script immediately exits also reporting an error. Why report another error? If our script does not explicitly say exit 1 then the script is assumed to have completed successfully. The error from cp does not matter unless we explicitly make it matter by passing it to our script's caller. William Shotts, Jr's article Errors and S

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