Why number 9 in kill -9 command in unix? [closed]

Why number 9 in kill -9 command in unix? [closed]

unix command history kill

unix

Where does '.' and '..' come from?

unix shell history

unix

Why do some compilers use "a.out" as the default name for executables?

c unix history compiler-construction

unix

What is the reason for having unreserved identifiers as built-in macros in gcc?

c++ linux unix macros history

unix

Unix commandline history substitution ^foo^bar (for multiple replacements)

bash unix history

unix

How to load bash command history from file

bash shell unix command-line history

unix

Why is the segfault signal on *nix abbreviated as 'SIGSEGV' and not 'SIGSEGF'?

unix history segmentation-fault

unix

converting the hash tag timestamps in history file to desired string

bash unix ssh history time-format

unix

Within vim's regex engine, why are some metacharacters escaped and some are not?

regex unix vim history vi

unix

What is the format of shell history files

bash shell unix zsh history

unix

How to find history of shell commands since machine was created?

linux unix history

unix