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comments powered by Disqus Benjamin is a Systems Architect working in the financial services industry focused on platforms that require Continuous Availability. Within the parenthesis the commands are chained together using the && and || constructs again. Macro: int ETXTBSY An attempt to execute a file that is currently open for writing, or write to a file that is currently being executed. Macro: int EPIPE Broken pipe; there is no process reading from the other end of a pipe. have a peek at this web-site

Several answers define exit status 2 as "Misuse of bash builtins", which is only correct when bash (or a bash script) exits with status 2. Takagi looked like? An error exit function Since we will be checking for errors often in our programs, it makes sense to write a function that will display error messages. Do not do this. http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html

Linux Errno Example

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?). That is, the program's ability to handle situations in which something goes wrong. See Socket Options. This error can happen in a few different situations: An operation that would block was attempted on an object that has non-blocking mode selected.

How does the Spousal Surcharge generally work? Macro: int ETOOMANYREFS ??? In brief, termination due to an uncaught signal results in exit status 128+[. Errno.h In C Previous | Contents | Top | Next © 2000-2016, William E.

Macro: int EGREGIOUS You did what? This value is referred to as an exit code or exit status. What checkin and checkout date to pick when arriving/leaving after midnight? http://man7.org/linux/man-pages/man3/errno.3.html It's not, if nothing goes wrong.

Macro: int ENETUNREACH A socket operation failed because the subnet containing the remote host was unreachable. Errno.h Windows Macro: int ENOLCK No locks available. While this is a working solution to the problem, there are more clever methods that will save us some typing. Aborting." 1>&2 exit 1 fi Here we check to see if the cd command is successful.

Posix Error Codes

special variable to print the exit code of the script. http://www.tldp.org/LDP/abs/html/exit-status.html Macro: int EDESTADDRREQ No default destination address was set for the socket. Linux Errno Example They are recorded in:- /usr/include/asm/errno.h Here is a copy of that file as of Aug 2004 on RedHat 7.3 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* Linux Errno To String This error is never generated by GNU/Hurd systems, but it can result from an operation to an NFS server running another operating system.

Not the answer you're looking for? Check This Out Macro: int ENAMETOOLONG Filename too long (longer than PATH_MAX; see Limits for Files) or host name too long (in gethostname or sethostname; see Host Identification). However, for other applications, there are different exit codes. Any script that is useful in some fashion will inevitably be either used in another script, or wrapped with a bash one liner. Errno.h Linux Kernel

Macro: int EOPNOTSUPP The operation you requested is not supported. How could a smaller country successfully take control of a much larger country? Execution: $ ./tmp.sh touch: cannot touch '/root/test': Permission denied created file $ echo $? 0 As you can see after running the ./tmp.sh command the exit code was 0 which indicates Source share|improve this answer answered Jul 9 '09 at 5:56 David add a comment| up vote 15 down vote There are no standard exit codes, aside from 0 meaning success.

So to check the exit status, we could write the script this way: # Check the exit status cd $some_directory if [ "$?" = "0" ]; then rm * else echo Ebadf Using parameter expansion, it is possible to perform a number of useful string manipulations. For example, if you try to delete a file that is the root of a currently mounted filesystem, you get this error.

See Socket Addresses.

Macro: int EPFNOSUPPORT The socket communications protocol family you requested is not supported. Then there's cases where success or failure is ambiguous. Macro: int EPROGUNAVAIL ??? Errno 0 The macro EWOULDBLOCK is another name for EAGAIN; they are always the same in the GNU C Library.

Using them, we can see how the $? Some people just put them around every variable out of habit. The more command and the spell command give 1 for failure, unless the failure is a result of permission denied, nonexistent file, or attempt to read a directory. have a peek here See Connecting.

Its value is significant only when the return value of the call indicated an error (i.e., -1 from most system calls; -1 or NULL from most library functions); a function that E.g., termination by SIGINT (signal 2) results in exit status 130.