The blank in SHELL
2017-01-09 08:45
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本文主要说明防止在shell脚本中，用于检测文件是否存在出现问题时，空格符号的问题。
A="~/home/lafile/xxx.sh"
不应该写成：
A = "~/home/lafile/xxx.sh"
否则在（if, while, until）test 过程中无法检测到实际上是否存在这个文件。
在shell脚本中：定义变量不要加空格！
如：A="~/home/lafile/xxx.sh"
不应该写成：
A = "~/home/lafile/xxx.sh"
否则在（if, while, until）test 过程中无法检测到实际上是否存在这个文件。
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