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Join Date: May 2005
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when i read linux boot scripts, i often meet this expression: ${1:-}. i can't understand it. what's more, i don't understand this condition: [ -z "${1:-}" ] too. anyone can help me ? thanks!!!
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Join Date: Nov 2004
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Originally Posted by zkjian517
when i read linux boot scripts, i often meet this expression: ${1:-}. i can't understand it. what's more, i don't understand this condition: [ -z "${1:-}" ] too. anyone can help me ? thanks!!!
[quote man ksh]
${parameter:-word}
Use Default Values. If parameter is unset or null,
the expansion of word will be substituted; other-
wise, the value of parameter will be substituted.
-z string True, if length of string is zero.
[/code]
vlad
+-----------------------------------+
| #include <disclaimer.h> |
+-----------------------------------+
+-----------------------------------+
| #include <disclaimer.h> |
+-----------------------------------+
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Join Date: Nov 2004
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Newbie Poster
doing 'man ksh' yields:
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Originally Posted by vgersh99
••••Originally Posted by man ksh${parameter:-word}
Use Default Values. If parameter is unset or null,
the expansion of word will be substituted; other-
wise, the value of parameter will be substituted.
-z string True, if length of string is zero.
vlad
+-----------------------------------+
| #include <disclaimer.h> |
+-----------------------------------+
+-----------------------------------+
| #include <disclaimer.h> |
+-----------------------------------+
|
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