Why Do I Get Error 255 When Returning 1 Unix amp Linux Stack
2 Answers Sorted by 34 Because in UNIX POSIX the exit code of a program is defined to be an unsigned 8 bit value Converting 1 to unsigned 8 bit gives 255 Edit to add To give more detail the wait family of system calls in UNIX encode the result of a process into a single 32bit integer
Documentation How Do I Get The List Of Exit Codes and or Return , 255 exit status out of range exit takes only integer args in the range 0 255 Example sh c exit 3 14159 echo sh line 0 exit 3 14159 numeric argument required 255 According to the above table exit codes 1 2 126 165 and 255 have special meanings and should therefore be avoided for user specified exit parameters
Getting Exit Value Of A Shell Script 255 Every Time
A simpler way to do the shell script would be set e java TestJar 1 cp test jar The e option means that if any command exits with nonzero status bash will immediately exit itself also with that status It s a bit like exception handling for shell script
What Is The Min And Max Values Of Exit Codes In Linux , 1 For part 3 do you mean returning from a shell function That may depend on the shell but I note that Bash s manual says quot Exit statuses fall between 0 and 255 quot and quot Exit statuses from shell builtins and compound commands are also limited to this range quot return is of course a shell builtin Toby Speight Jan 24 2018 at 13 33
Exit Status Bash Reference Manual
Exit Status Bash Reference Manual , Exit statuses fall between 0 and 255 though as explained below the shell may use values above 125 specially Exit statuses from shell builtins and compound commands are also limited to this range Under certain circumstances the shell will use special values to indicate specific failure modes
Failed To Deploy Error Command Failed With Exit Code 255 Support
Exit Codes In Bash Scripting TecAdmin
Exit Codes In Bash Scripting TecAdmin Bash Exit Codes The exit code is a number between 0 and 255 This is the value returns to parent process after completion of a child process In other words it denotes the exit status of the last command our function The exit code value return based on a command or program will successfully execute or not
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Basics of Bash Exit Codes In Bash an exit code is an integer value between 0 and 255 that a command or script returns to the shell By convention an exit code of 0 means success and any non zero value means failure Some commonly used exit codes are Exit code 0 Success Exit code 1 General error Exit code 2 Misuse Bash Exit Codes A Complete Guide Stack Diary. Exit codes are a number between 0 and 255 which is returned by any Unix command when it returns control to its parent process Other numbers can be used but these are treated modulo 256 so exit 10 is equivalent to exit 246 and exit 257 is equivalent to exit 1 bin bash errHandler echo quot Something went wrong Exiting now quot exit 1 trap errHandler ERR INT pi process bin pi echo pi process stuff bin pi is a php script it s exiting with exit code 255 and a fatal error However the bash trap isn t being caught How come
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