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  • 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 does $# mean in shell? - Unix Linux Stack Exchange
    You can always check the man page of your shell man bash says: Special Parameters # Expands to the number of positional parameters in decimal Therefore a shell script can check how many parameters are given with code like this: if [ "$#" -eq 0 ]; then echo "you did not pass any parameter" fi
  • 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 $? (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
  • 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
  • bash - Shell equality operators (=, ==, -eq) - Stack Overflow
    What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?
  • 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
  • shell - What does -- (double dash double hyphen) mean? - Unix . . .
    In man bash we can read in Shell Builtin Commands section : Unless otherwise noted, each builtin command documented in this section 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





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