tag 22045 notabug close 22045 stop Hello,
On 11/28/2015 03:47 PM, Matthias Klose wrote:
found with coreutils-8.23, expr substr returns with an error code when the substring consists of only '0' characters, and the match is started at position 1.
$ expr substr 00001234 1 4; echo $? 0000 1 $ expr substr 00001234 1 5; echo $? 00001 0
'expr' is unique in its exit-codes: exit codes of 0 or 1 *do not* indicate success/error, but whether the result evaluated to null or zero: From POSIX: http://pubs.opengroup.org/onlinepubs/009695399/utilities/expr.html#tag_04_50_14 " The following exit values shall be returned: 0 The expression evaluates to neither null nor zero. 1 The expression evaluates to null or zero. 2 Invalid expression.
2 An error occurred.
" And so, the exit codes you see indeed match the last computer value. regards, - assaf
