“Undefined variable script”的版本间差异
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（以“first file (excutable): echo 'this is tete' echo $hi echo 'OK!' exit run it and it prints: this is tete OK! second file (excutable): # echo 'this is tete'...”为内容创建页面） |
（没有差异）
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2013年12月18日 (三) 11:11的版本
first file (excutable): echo 'this is tete' echo $hi echo 'OK!' exit run it and it prints: this is tete
OK! second file (excutable): # echo 'this is tete' echo $hi echo 'OK!' exit run it and it prints: this is tete hi: Undefined variable.
Because 1st file have no "#"/"#!/bin/sh"/"#!/bin/csh" on the first line, in most of the linux distributions, the default interpreter of a script is /bin/sh if it is not specified, and /bin/sh DOES NOT think an undefined variable is a problem! "#" will call csh, and print the problem.