리눅스 프로세스 명령어(linux process command) 1. Environment

1. startup file

1-1 PATH

• setting CWD(current working directory)

PATH=$PATH:.

* .: current working directory

• print path

echo $PATH

1-2 startup file details

• when bash starts, it reads configuration scripts ‘startup file’

• Login shell session startup file

/etc/profile	global configuration
~/.bash_profile	user's configuration
~/.bash_login	when ~/.bash_profile not found
~/.profile	when ~/.bash_profile, ~/.bash_login not found

• Non-login shell session startup file

/etc/bash.bashrc	global configuration
~/.bashrc	user's configuration

1-3 alias

• command for nickname(alias)

• invalid when logout -> set in login configuration file

• both command, pathname can be set

alias nickname="target"

1-4 source

• changing config file cannot affect right now until restart shell

• forcing to affect right now

source configfile

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2. process command

2-1 terminologies

process	active entity
task	single or multiple process
job	collections of job

therefore, process $\in$ task $\in$ job

• foreground

   current task

• background

   running behind the scene

   if write & in end of command, running in background process

   sub-shell: no stdin(keyboard)

   to prevent print on the screen: redirect to file

2-2 keystroke with ctrl

ctrl + c	interrupting
ctrl + d	EOF
ctrl + h	backspace
ctrl + z	stop foreground process and place in background

2-3 process

ps

usually pipelined with |

* option

-a	all user process
-u	user info
-x	all process whether not attached in shell
-e	include all running process
-f	full string
-l	long list

2-4 top

top

viewing process dynamically

press q to quit

2-5 job

job

showing job ID

2-6 kill

• to kill process

kill PID

• to kill job

kill %jobID