What do 0 1 2 mean in shell script

Question

I often come across     0  1  2 etc     in shell scripting  what I know is that    returns the exit status of the last command  echo  this will return 0  echo      but what do the others do  what are they called and is there more  perhaps like  3  4  5

User · Answer

These are positional arguments of the script.

Executing

./script.sh Hello World

Will make

$0 = ./script.sh
$1 = Hello
$2 = World

Note

If you execute ./script.sh, $0 will give output ./script.sh but if you execute it with bash script.sh it will give output script.sh.

User · Answer

They are called the Positional Parameters   3 4 1 Positional Parameters A positional parameter is a parameter denoted by one or more digits  other than the single digit 0  Positional parameters are assigned from the shell   s arguments when it is invoked  and may be reassigned using the set builtin command  Positional parameter N may be referenced as   N   or as  N when N consists of a single digit  Positional parameters may not be assigned to with assignment statements  The set and shift builtins are used to set and unset them  see Shell Builtin Commands   The positional parameters are temporarily replaced when a shell function is executed  see Shell Functions   When a positional parameter consisting of more than a single digit is expanded  it must be enclosed in braces

[bash] What do $? $0 $1 $2 mean in shell script?

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