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Possible return values for $?


 
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# 1  
Old 01-03-2006
Possible return values for $?

I think the $? returns 0 if the last issued command was successful and otherwise if not. But does anyone knows the value list that may be returned ? (or it is only zero/one ? )

Thanks in advance,
Abrahao.
# 2  
Old 01-04-2006
That depends on the program you have run. Return codes are usually listed in the man pages.
# 3  
Old 01-04-2006
you can get a list from

/usr/include/sys/errno.h
# 4  
Old 01-04-2006
suggestion

the $? will return the exit code of the previous command executed....

the value depends on the success of the last command...

0 is always used to denote a success

other values depend on the type of error....


example: in a cp command if the source file is not found, it will give a non-zero erro and if destination is not found, it will give another non-zero error value... so depending on the value returned, we can find out the error occured

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