HI , I get this error 127 while running a complex script. I want to know what does this mean and possibly all other codes .
'man bash' will tell you that 127 is an error code that indicates that a command was not found in the PATH.
exit codes of > 128 indicate that the last child process was killed by the signal $(($RC - 128)). The 'bash' man page documents this as well.
/usr/include/sysexits.h details standard exit codes for Unix applications.
'man errno' will describe all of the errors that can be set for errno when you are programming in C (and possibly other languages). You can use the C function 'perror' to print out a description of the current errno value at runtime.
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