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Full Discussion: $? means?
Top Forums UNIX for Dummies Questions & Answers $? means? Post 302253937 by sai21 on Monday 3rd of November 2008 06:35:01 AM
Old 11-03-2008
$? means that the return code of the previous command. When you write a script, we need to ensure that the command has successful or not. This will be done by checking the return code of the previous command. i.e $?

Upon successful execution of command, it will return the code 0 else non-negative no.
For ex:

$ rm tmp
$ echo $?
0

$ ls tmp
ls: tmp: No such file or directory
$ rm tmp
rm: cannot remove `tmp': No such file or directory
$ echo $?
1
 

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WNINTRO(7)						  Miscellaneous WordNettm Topics						WNINTRO(7)

NAME
wnintro - introduction to miscellaneous WordNet information SYNOPSIS
morphy - discussion of WordNet's morphological processing uniqbeg - unique beginners for noun hierarchies wngloss - glossary of terms used in WordNet wngroups - discussion of WordNet search code to group similar senses wnlicens - text of WordNet license agreement wnpkgs - information about WordNet packages and distribution wnstats - database statistics DESCRIPTION
This section of the WordNet Reference Manual contains manual pages that describe various topics related to WordNet and the semantic concor- dances, and a glossary of terms. SEE ALSO
wnintro(1), wnintro(3), wnintro(5), morphy(7), uniqbeg(7), wngroups(7), wnlicens(7), wnpkgs(7), wnstats(7), wngloss(7). Fellbaum, C. (1998), ed. "WordNet: An Electronic Lexical Database". MIT Press, Cambridge, MA. WordNet 3.0 Dec 2006 WNINTRO(7)
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