Display last exit status of a command

echo $?
The variable ? contain the last exit status of a command, it can be printed for troubleshooting purpose.
Sample Output
# date
sab mag  9 19:30:38 CEST 2009
# echo $?
0

11
2009-05-09 17:32:23

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What Others Think

? can be really useful in shell scripts too. I've used this in a while loop where I do a "host hostname" command while waiting for a machine to come up. The loop exits when the exit status changes and the script ends by alerting me that the machine is up.
cards · 475 weeks ago
Sometimes i don't understand the votes on that site where there are interesting commands that have minus and others which vote numbers is debatable sometimes. No offence but, to me $? variable belongs to the basics (and actually was in the very first things I was taught about Linux).
UnixNeko · 335 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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