Bash prompt HOWTO 提示符

这里找到更多的颜色代码，甚至可以让字符反相和闪烁！

As mentioned before, non-printingescape sequences have to be enclosed in \[\033[ and \]. For colour escape sequences, theyshould also be followed by a lowercase m.

If you try out the following promptsin an xterm and find that you aren't seeing the colours named, check out your ~/.Xdefaults file(and possibly its bretheren) for lines like XTerm*Foreground: BlanchedAlmond.This can be commented out by placing an exclamation mark ("!") infront of it. Of course, this will also be dependent on what terminal emulatoryou're using. This is the likeliest place that your term foreground colourswould be overridden.

To include blue text in the prompt:

PS1="\[\033[34m\][\$(date+%H%M)][\u@\h:\w]$ "

The problem withthis prompt is that the blue colour that starts with the 34 colour code isnever switched back to the regular colour, so any text you type after the promptis still in the colour of the prompt. This is also a dark shade of blue, socombining it with the bold code might help:

PS1="\[\033[1;34m\][\$(date  +%H%M)][\u@\h:\w]$\[\033[0m\] "

The prompt is nowin light blue, and it ends by switching the colour back to nothing (whateverforeground colour you had previously).

Here are the restof the colour equivalences:

Black        0;30     Dark Gray     1;30    Blue         0;34     Light Blue    1;34    Green        0;32     Light Green   1;32    Cyan         0;36     Light Cyan    1;36    Red          0;31     Light Red     1;31    Purple       0;35     Light Purple  1;35    Brown        0;33     Yellow        1;33    Light Gray   0;37     White         1;37

Daniel Dui(ddui@iee.org) points out that to be strictly accurate, we must mention thatthe list above is for colours at the console. In an xterm, the code 1;31 isn't"Light Red," but "Bold Red." This is true of all thecolours.

You can also setbackground colours by using 44 for Blue background, 41 for a Red background,etc. There are no bold background colours. Combinations can be used, like LightRed text on a Blue background: \[\033[44;1;31m\], although settingthe colours separately seems to work better (ie. \[\033[44m\]\[\033[1;31m\]). Other codesavailable include 4: Underscore, 5: Blink, 7: Inverse, and 8: Concealed.

file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif	Many people (myself included) object strongly to the "blink"  attribute because it's extremely distracting and irritating. Fortunately, it  doesn't work in any terminal emulators that I'm aware of - but it will still  work on the console.
file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif	If you were wondering (as I did) "What use is a 'Concealed'  attribute?!" - I saw it used in an example shell script (not a prompt)  to allow someone to type in a password without it being echoed to the screen.  However, this attribute doesn't seem to be honoured by many terms other than  "Xterm."

Based on a promptcalled "elite2" in the Bashprompt package (which I have modified towork better on a standard console, rather than with the special xterm fontsrequired to view the original properly), this is a prompt I've used a lot:

function elite    {       local GRAY="\[\033[1;30m\]"    local LIGHT_GRAY="\[\033[0;37m\]"    local CYAN="\[\033[0;36m\]"    local LIGHT_CYAN="\[\033[1;36m\]"    local NO_COLOUR="\[\033[0m\]"       case $TERM in        xterm*|rxvt*)             local TITLEBAR='\[\033]0;\u@\h:\w\007\]'             ;;         *)             local TITLEBAR=""             ;;    esac       local temp=$(tty)    local GRAD1=${temp:5}    PS1="$TITLEBAR\    $GRAY-$CYAN-$LIGHT_CYAN(\    $CYAN\u$GRAY@$CYAN\h\    $LIGHT_CYAN)$CYAN-$LIGHT_CYAN(\    $CYAN\#$GRAY/$CYAN$GRAD1\    $LIGHT_CYAN)$CYAN-$LIGHT_CYAN(\    $CYAN\$(date +%H%M)$GRAY/$CYAN\$(date  +%d-%b-%y)\    $LIGHT_CYAN)$CYAN-$GRAY-\    $LIGHT_GRAY\n\    $GRAY-$CYAN-$LIGHT_CYAN(\    $CYAN\$$GRAY:$CYAN\w\    $LIGHT_CYAN)$CYAN-$GRAY-$LIGHT_GRAY "    PS2="$LIGHT_CYAN-$CYAN-$GRAY-$NO_COLOUR  "    }

I define thecolours as temporary shell variables in the name of readability. It's easier towork with. The "GRAD1" variable is a check to determine what terminalyou're on. Like the test to determine if you're working in an Xterm, it onlyneeds to be done once. The prompt you see look like this, except in colour:

--(giles@gcsu202014)-(30/pts/6)-(0816/01-Aug-01)--    --($:~/tmp)--

To help myselfremember what colours are available, I wrote a script that output all thecolours to the screen. Daniel Crisman has supplied a much nicer version which Iinclude below:

#!/bin/bash    #    #    This file echoes a bunch of color codes to the    #    terminal to demonstrate what's available.  Each    #    line is the color code of one forground color,    #    out of 17 (default + 16 escapes), followed by a    #    test use of that color on all nine background    #    colors (default + 8 escapes).    #       T='gYw'    # The test text       echo -e "\n                 40m      41m     42m     43m\          44m     45m     46m      47m";       for FGs in '    m' '    1m' '  30m' '1;30m' '  31m' '1;31m' '  32m' \                '1;32m' '  33m' '1;33m' '  34m' '1;34m' '  35m' '1;35m' \                '  36m' '1;36m' '  37m' '1;37m';      do  FG=${FGs// /}       echo -en " $FGs \033[$FG   $T  "      for  BG in 40m 41m 42m 43m 44m 45m 46m 47m;         do echo -en "$EINS \033[$FG\033[$BG  $T   \033[0m";       done       echo;    done    echo

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