Unless otherwise noted, each builtin command documented as accepting options preceded by ‘-’ accepts ‘--’ to signify the end of the options. The :, true, false, and test builtins do not accept options and do not treat ‘--’ specially. The exit, logout, break,continue, let, and ...
Shell 接收到用户输入的命令,将命令送入操作系统执行,并将结果返回给用户。本书中,除非特别指明,Shell 指的就是命令行环境。 其次,Shell 是一个命令解释器,解释用户输入的命令。它支持变量、条件判断、循环操作等语法,所以用户可以用 Shell 命令写出各种小程序,又称为脚本(script)。这些脚本都通过 Shell 的解释执行...
, bashdb, will be the set linetrace on to print every command executed, print var to display the current assigned value of the variable var, the step n (or s n) to get to the next action by n step (n=1 if not provided) and cont (or c) to continue running the full script....
In larger scripts, you might need to process large amounts of data stored in arrays. For instance, you might have a script that reads lines from a file into an array and then processes each line individually. In such cases, knowing how to loop through arrays in Bash is invaluable. mapfi...
Install & Update Script To install or update nvm, you should run the install script. To do that, you may either download and run the script manually, or use the following cURL or Wget command: curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash wget ...
bash是用C语言写成的,其源码中只使用了少量的数据结构:数组,树,单向链表,双向链表和哈希表。几乎所有的bash结构都是用这些基本结构实现的。
To install or update nvm, you should run the install script. To do that, you may either download and run the script manually, or use the following cURL or Wget command:curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash...
To help you set up a new BigBlueButton server (or upgrade from an earlier version of BigBlueButton where applicable), bbb-install.sh is a shell script that automates the installation/upgrade steps (view the source to see all the details). Depending on your server's internet connection, bbb-...
如果執行失敗,因為檔案不是可執行格式,並且此檔案不是目錄,就假定它是 一個 shell script (稿本),一個包含 shell 命令的檔案。此時將孵化 (spawn) 出一個子 shell 來執行它。子 shell 重新初始化自身,效果就好像是 執行 了一個新的 shell 來處理稿本一樣,但是父 shell 保存的命令位置仍然被 保留 (參見下面...
如果執行失敗,因爲文件不是可執行格式,並且此文件不是目錄,就假定它是 一個 shell script (腳本),一個包含 shell 命令的文件。此時將孵化 (spawn) 出一個子 shell 來執行它。子 shell 重新初始化自身,效果就好像是 執行 了一個新的 shell 來處理腳本一樣,但是父 shell 保存的命令位置仍然被 保留 (參見下面...