프롬프팅(prompting) PS1, PS2

리눅스의 PS1은 현재 쉘의 앞부분을 출력할 때 유용하게 사용할 수 있다.

[~] echo :$PS1:

:[\w]\[\033[00m\] :

$ PS1=" \"$PWD\" "

 "/Users/samuel.kim"

"/Users/samuel.kim" PS1="$ "

$

$ PS1="명령 내려주세요 $ "

명령 내려주세요 $

명령 내려주세요 $

$ PS1="\H $ "

google-MacBook-Air-100.local $

google-MacBook-Air-100.local $

리눅스의 PS2는 멀티 커맨드 라인에 사용되는 문자로 사용된다.

$ echo :$PS2:

:> :

$  for x in 10 20 30

> do

> echo $x

> done

10

20

30

$ for x in 10 20 30

 do

 echo $x

 done

10

20

30

자세한 내용은 man bash의 prompting 섹션에 설명되어 있다. 

$ man bash

PROMPTING

       When executing interactively, bash displays the primary prompt  PS1

       when  it  is  ready to read a command, and the secondary prompt PS2

       when it needs more input to complete a command.  Bash allows  these

       prompt strings to be customized by inserting a number of backslash-

       escaped special characters that are decoded as follows:

              \a     an ASCII bell character (07)

              \d     the date in "Weekday Month Date" format  (e.g.,  "Tue

                     May 26")

              \D{format}

                     the format is passed to strftime(3) and the result is

                     inserted into the  prompt  string;  an  empty  format

                     results  in  a  locale-specific  time representation.

                     The braces are required

              \e     an ASCII escape character (033)

              \h     the hostname up to the first `.'

              \H     the hostname

              \j     the number of jobs currently managed by the shell

              \l     the basename of the shell's terminal device name

              \n     newline

              \r     carriage return

              \s     the name of the shell, the basename of $0  (the  por-

                     tion following the final slash)

              \t     the current time in 24-hour HH:MM:SS format

              \T     the current time in 12-hour HH:MM:SS format

              \@     the current time in 12-hour am/pm format

              \A     the current time in 24-hour HH:MM format

              \u     the username of the current user

              \v     the version of bash (e.g., 2.00)