Linux Ssh Script Returns 255 Error Stack Overflow
If there s a problem with authentication or connection such as not being able to read a password from the terminal ssh will exit with 255 without being able to run your actual script Verify to make sure you can run true instead to see if the ssh connection is established successfully
Documentation How Do I Get The List Of Exit Codes and or Return , 4 Answers Sorted by 34 Exit codes indicates a failure condition when ending a program and they fall between 0 and 255 The shell and its builtins may use especially the values above 125 to indicate specific failure modes so list of codes can vary between shells and operating systems e g Bash uses the value 128 N as the exit status
Standard Exit Status Codes In Linux Baeldung On Linux
Because exit codes are represented by a single byte value the highest possible exit code is 255 However nothing prevents us from returning exit codes larger than this Values over 255 are out of range and get wrapped around We should be very careful as this can be a source of unexpected results
Linux Shell Script Exit Codes Unix amp Linux Stack Exchange, For example https www cyberciti biz faq linux bash exit status set exit statusin bash I also looked at some GNU docs and its kind of confusing Exit statuses fall between 0 and 255 though as explained below the
Returning Information From A Shell Script Via An Exit Code The Shell
Returning Information From A Shell Script Via An Exit Code The Shell , 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
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Shell Script Well Behaved Non Zero Exit Codes Unix
Shell Script Well Behaved Non Zero Exit Codes Unix In shell scripting fake exit statuses over 128 are provided for certain conditions so it s probably best to avoid these ssh uses 255 though which is not used this way The two exit statuses below 128 are also used to represent certain shell errors so you generally don t want to use those codes either
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2 Have a code I ve used for the tests hola quot cd var amp amp ssh localhost error quot hola echo Executing just cd var amp amp ssh localhost error will return code 255 But executing hola quot cd var amp amp ssh localhost error quot hola returns 0 while expected 255 hola quot ssh localhost error quot hola returns 255 Why linux bash ssh Share Improve this Bash Exit Status Is 0 While Expected Is 255 Super User. This final reserved exit status is easy to produce but difficult to interpret The documentation that I ve found states that you receive exit status 255 if you use an exit code that s out of the range 0 255 I ve found that this status can also be produced in other ways Here s one example ip Usage info for the ip command echo 255 Exit code at the end of a bash script Ask ion Asked 7 years 2 months ago Modified 3 years 4 months ago Viewed 187k times 48 I am confused about the meaning of the exit code in the end of a bash script I know that exit code 0 means that it finished successfully and that there are many more exit codes numbers 127 if I m not mistaken
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