What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things.

Feb 20, 2011 · When going through one shell script, I saw the term "$?". What is the significance of this term?

在化学中，开壳（open-shell）和闭壳（closed-shell）是什么意思？ 在一些化学领域的文献里，经常会提到自由基是一个open-shell（开壳）的物种，这里的「open-shell」这个概念是什么意 …

Oct 26, 2023 · I have a script that parses a rudimentary .env file and exports its contents as environment variables, before taking further action: set -eu test -f .env && …

shell infrastructure host是Windows的核心组件，用于支持开始菜单、任务栏和操作系统的其他重要图形元素，可执行镜像为 sihost.exe，关闭该进程会导致系统无法正常运行，一般会在查看过 …

当你写脚本打算在不同的 shell 环境下运行时，了解这些细微的差别和兼容性问题是很重要的。 如果你想编写兼容 POSIX 的脚本，在比较字符串时最好使用单等号 = 或者用双方括号的表达式 …

May 8, 2012 · I understand the basic difference between an interactive shell and a non-interactive shell. But what exactly differentiates a login shell from a non-login shell? Can you give …

Aug 2, 2025 · When it comes to shell scripts it's difficult to support both short options and long options. I usually pick one or the other and use getopt or getopts as appropriate.

Apr 5, 2020 · Lets say I SSH to my linux shell. Inside it I want to run a program that will run for 8 hours: I create a "detached screen" by entering screen and then crtl+a, crtl+d to deattach it. …

Jul 15, 2024 · 3.1. 验证Shell路径： 打开文件资源管理器，导航到终端配置中指定的Shell路径。 确认路径下存在对应的可执行文件（例如，powershell.exe、cmd.exe、bash.exe等）。 3.2. 修 …