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$( CMD ) 将会执行 CMD, 然后用 CMD 的输出作为整体的值. 例如: for file in $(ls) 会遍历当前目录的文件 [[]] 进行比较: if [[ $? -ne 0 ]]; then echo "File $file does not have any foobar, a 阅读全文
摘要:
【计算机科学速成课】[40集全/精校] - Crash Course Computer Science ep1. Early Computing Charles Babbage English mathematician and inventor conceived the first automa 阅读全文