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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
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 - 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
What is the difference between shell, console, and terminal? The shell is the program which actually processes commands and returns output Most shells also manage foreground and background processes, command history and command line editing These features (and many more) are standard in bash, the most common shell in modern linux systems A terminal refers to a wrapper program which runs a shell