安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- linux - What does $@ mean in a shell script? - Stack Overflow
What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@
- What is the $? (dollar question mark) variable in shell scripting?
I'm trying to learn shell scripting, and I need to understand someone else's code What is the $? variable hold? I can't Google search the answer because they block punctuation characters
- Difference between ${} and $() in a shell script - Super User
Difference between $ {} and $ () in a shell script Asked 9 years, 11 months ago Modified 4 months ago Viewed 120k times
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
Shell equality operators (=, ==, -eq) Asked 11 years, 6 months ago Modified 3 years ago Viewed 631k times
- linux - What is the meaning of $? in a shell script? - Unix Linux . . .
When going through one shell script, I saw the term "$?" What is the significance of this term?
- What are the special dollar sign shell variables? - Stack Overflow
$! is the PID of the most recent background command $0 is the name of the shell or shell script Most of the above can be found under Special Parameters in the Bash Reference Manual Here are all the environment variables set by the shell For a comprehensive index, please see the Reference Manual Variable Index
- shell - How can I compare numbers in Bash? - Stack Overflow
BTW, in bash a semi-colon is a statement separator, not a statement terminator, which is a new-line So if you only have one statement on a line then the ; at end-of-line are superfluous Not doing any harm, just a waste of keystrokes (unless you enjoy typing semi-colons)
- What is the purpose of the : (colon) GNU Bash builtin?
What is the purpose of a command that does nothing, being little more than a comment leader, but is actually a shell builtin in and of itself? It's slower than inserting a comment into your scripts
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