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英文字典中文字典相关资料:


  • linux - What does $@ mean in a shell script? - Stack Overflow
    The shell splits tokens based on the contents of the IFS environment variable Its default value is \t\n; i e , whitespace, tab, and newline Expanding "$@" gives you a pristine copy of the arguments passed Expanding $@ may not
  • What is the $? (dollar question mark) variable in shell scripting?
    The shell treats several parameters specially These parameters may only be referenced; assignment to them is not allowed [ ]? Expands to the exit status of the most recently executed foreground pipeline ANSI C and POSIX then recommend that: 0 means the program was successful other values: the program failed somehow
  • bash - Shell equality operators (=, ==, -eq) - Stack Overflow
    What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?
  • Difference between $ {} and $ () in a shell script - Super User
    The above (along with many more forms of ${parameter…something_else} constructs) are discussed at greater length in the shell’s man page, bash(1) A Note on Quotes Note that you should always quote shell variables unless you have a good reason not to, and you’re sure you know what you’re doing By contrast, while braces can be
  • What is the meaning of $? in a shell script? - linux
    This latter usage is faster, does not contaminate the shell's variable namespace with what amounts to temp variables, can often be a lot more readable for humans and encourages the use of "positive logic", the practice of writing conditionals without negations, which has cognitive simplicity in most situations
  • What are the special dollar sign shell variables? - Stack Overflow
    $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
  • Meaning of $? (dollar question mark) in shell scripts
    The shell treats several parameters specially These parameters may only be referenced; assignment to them is not allowed [ ]? Expands to the exit status of the most recently executed foreground pipeline ANSI C and POSIX then recommend that: 0 means the program was successful other values: the program failed somehow
  • Difference between Login Shell and Non-Login Shell?
    A login shell is the first process that executes under your user ID when you log in for an interactive session The login process tells the shell to behave as a login shell with a convention: passing argument 0, which is normally the name of the shell executable, with a -character prepended (e g -bash whereas it would normally be bash)
  • shell - Difference between sh and Bash - Stack Overflow
    Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel) There are many shell implementations available, like sh, Bash, C shell, Z shell, etc Using any of the shell programs, we will be able to execute commands that are supported by that shell program Bash - It derived from Bourne





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