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  • 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
  • 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
  • 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
  • regex - Meaning of =~ operator in shell script - Stack Overflow
    The return value is 0 if the string matches the pattern, and 1 otherwise If the regular expression is syntactically incorrect, the conditional expression's return value is 2 If the shell option nocasematch is enabled, the match is performed without regard to the case of alphabetic characters
  • 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
  • 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
  • shell - What does 2 gt; 1 do in command line? - Super User
    The at the end is how you tell the shell to run the command as a job in the background This causes the prompt to return immediately while the command is run asynchronously behind the scenes To see the current jobs type jobs in your terminal Note this is different from the processes running in your system To see those type top in the terminal
  • shell - How can I edit the $PATH on linux? - Super User
    It depends on the shell you're using On Solaris (I know the question is about Linux) one of the shells (can't remember which one off the top of my head) requires that you do the export separately from setting the value in a script So I've just gotten into the habit of doing it on 2 lines –
  • bash - Shell equality operators (=, ==, -eq) - Stack Overflow
    What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?





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