ubuntu下source、sh、bash、./执行脚本的区别详细介绍
<p><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>ubuntu下source、sh、bash、./执行脚本的区别</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><strong style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>1.source命令用法：</strong><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> source FileName</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 作用:在当前bash环境下读取并执行FileName中的命令。该filename文件可以无"执行权限"</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 注：该命令通常用命令“.”来替代。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 如：source .bash_profile </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> . .bash_profile两者等效。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> source(或点)命令通常用于重新执行刚修改的初始化文档。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> source命令(从 C Shell 而来)是bash shell的内置命令。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 点命令，就是个点符号，(从Bourne Shell而来)。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> source的程序主体是bash，脚本中的$0变量的值是bash，而且由于作用于当前bash环境，脚本中set的变量将直接起效</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><strong style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>2 sh, bash的命令用法：</strong><br><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> sh/bash FileName</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 作用:打开一个子shell来读取并执行FileName中命令。该filename文件可以无"执行权限"</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 注：运行一个shell脚本时会启动另一个命令解释器.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 每个shell脚本有效地运行在父shell(parent shell)的一个子进程里.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 这个父shell是指在一个控制终端或在一个xterm窗口中给你命令指示符的进程.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> shell脚本也可以启动他自已的子进程.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 这些子shell(即子进程)使脚本并行地，有效率地地同时运行脚本内的多个子任务.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 在ubuntu中sh只是bash的一个链接。 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 由于是在子shell中执行，脚本设置的变量不会影响当前shell。</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><strong style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>3、./的命令用法：</strong><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> ./FileName</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 作用:打开一个子shell来读取并执行FileName中命令。该filename文件需要"执行权限"</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 注：运行一个shell脚本时会启动另一个命令解释器.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 每个shell脚本有效地运行在父shell(parent shell)的一个子进程里.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 这个父shell是指在一个控制终端或在一个xterm窗口中给你命令指示符的进程.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> shell脚本也可以启动他自已的子进程.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 这些子shell(即子进程)使脚本并行地，有效率地地同时运行脚本内的多个子任务.</span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> 由于是在子shell中执行，脚本设置的变量不会影响当前shell。</span></p>
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