csh - 如何更改我的 tcsh 提示以显示我当前的工作目录？

Question

我正在使用 tcsh并且我正在寻找一种响应式工作目录的方式，我至少要在其中显示最后一个文件夹名称而不是获取完整路径。

想象一下我当前的工作目录是:

  [user@hostname/home/us/Desktop/my/projects]

然后我想显示这样的提示:

    [user@hostname projects] 

目前我正在使用 .cshrc文件中的文件我是这样写的:

  alias setprompt 'set prompt="[suman@`hostname` `pwd`:~] $"'
  alias setprompt 'set prompt="${LightGreen}[${yellow}suman${Light}${LightPurple}@%m ${LightGreen}:~] ${yellow}$ ${end} "'

我也没有 PS1 变量，也不知道它有什么作用，我想知道 .cshrc 之间的区别文件和 .bashrc文件。

Answer 1

您可以使用:

set prompt = '[%n@%m %c]$ '

%n对于用户名， %m用于主机名直到第一个 . , 和 %c对于最后一个目录部分。有大量这样的替换可用，您可以在 tcsh(1) 中找到它们的列表。 ，为方便起见复制如下。

使用 `pwd`不会工作，因为 cshrc file 在 shelll 启动时只读取一次，而不是在每次目录更改时读取。

I would like to know the difference between .cshrc file and .bashrc file.

cshrc文件由 csh 使用和 tcsh , bashrc文件由 bash 使用.尽管它们的用途相同，但它们是不同的程序(例如 ~/.mozilla/firefox 和 ~/.config/chromium )。

%/  The current working directory.
%~  The current working directory, but with one's  home  direc‐
    tory  represented  by `~' and other users' home directories
    represented  by  `~user'  as  per  Filename   substitution.
    `~user'  substitution happens only if the shell has already
    used `~user' in a pathname in the current session.
%c[[0]n], %.[[0]n]
    The trailing component of the current working directory, or
    n  trailing  components if a digit n is given.  If n begins
    with `0', the number  of  skipped  components  precede  the
    trailing  component(s)  in the format `/<skipped>trailing'.
    If the ellipsis shell variable is set,  skipped  components
    are  represented  by  an  ellipsis  so  the  whole  becomes
    `...trailing'.  `~' substitution is done as in `%~'  above,
    but  the  `~'  component  is ignored when counting trailing
    components.
%C  Like %c, but without `~' substitution.
%h, %!, !
    The current history event number.
%M  The full hostname.
%m  The hostname up to the first `.'.
%S (%s)
    Start (stop) standout mode.
%B (%b)
    Start (stop) boldfacing mode.
%U (%u)
    Start (stop) underline mode.
%t, %@
    The time of day in 12-hour AM/PM format.
%T  Like `%t', but in 24-hour format (but see  the  ampm  shell
    variable).
%p  The  `precise'  time  of  day in 12-hour AM/PM format, with
    seconds.
%P  Like `%p', but in 24-hour format (but see  the  ampm  shell
    variable).
\c  c is parsed as in bindkey.
^c  c is parsed as in bindkey.
%%  A single `%'.
%n  The user name.
%N  The effective user name.
%j  The number of jobs.
%d  The weekday in `Day' format.
%D  The day in `dd' format.
%w  The month in `Mon' format.
%W  The month in `mm' format.
%y  The year in `yy' format.
%Y  The year in `yyyy' format.
%l  The shell's tty.
%L  Clears  from the end of the prompt to end of the display or
    the end of the line.
%$  Expands the shell or environment variable name  immediately
    after the `$'.
%#  `>'  (or the first character of the promptchars shell vari‐
    able) for normal users, `#' (or  the  second  character  of
    promptchars) for the superuser.
%{string%}
    Includes string as a literal escape sequence.  It should be
    used only to change terminal attributes and should not move
    the  cursor  location.  This cannot be the last sequence in
    prompt.
%?  The return code of the command  executed  just  before  the
    prompt.
%R  In prompt2, the status of the parser.  In prompt3, the cor‐
    rected string.  In history, the history string.

`%B', `%S', `%U' and `%{string%}' are available in only  eight-
bit-clean shells; see the version shell variable.

The  bold,  standout  and underline sequences are often used to
distinguish a superuser shell.  For example,

    > set prompt = "%m [%h] %B[%@]%b [%/] you rang? "
    tut [37] [2:54pm] [/usr/accts/sys] you rang? _

If `%t', `%@', `%T', `%p', or `%P' is used, and noding  is  not
set,  then print `DING!' on the change of hour (i.e, `:00' min‐
utes) instead of the actual time.

Set by default to `%# ' in interactive shells.