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set prompt in sh

 
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# 15  
Old 03-25-2003
Check this out: http://www.unixguide.net/unix/faq/2.4.shtml

Bourne Shell (sh):

If you have a newer version of the Bourne Shell (SVR2 or newer)
you can use a shell function to make your own command, "xcd" say:

xcd() { cd $* ; PS1="`pwd` $ "; }

If you have an older Bourne shell, it's complicated but not
impossible. Here's one way. Add this to your .profile file:

LOGIN_SHELL=$$ export LOGIN_SHELL
CMDFILE=/tmp/cd.$$ export CMDFILE
# 16 is SIGURG, pick a signal that's not likely to be used
PROMPTSIG=16 export PROMPTSIG
trap '. $CMDFILE' $PROMPTSIG

and then put this executable script (without the indentation!),
let's call it "xcd", somewhere in your PATH

: xcd directory - change directory and set prompt
: by signalling the login shell to read a command file
cat >${CMDFILE?"not set"} < cd $1
PS1="\`pwd\`$ "
EOF
kill -${PROMPTSIG?"not set"} ${LOGIN_SHELL?"not set"}

Now change directories with "xcd /some/dir".
 
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LEARN ABOUT NETBSD

pam_get_user

PAM_GET_USER(3) 					   BSD Library Functions Manual 					   PAM_GET_USER(3)

NAME

     pam_get_user -- retrieve user name

LIBRARY

     Pluggable Authentication Module Library (libpam, -lpam)

SYNOPSIS

     #include <sys/types.h>
     #include <security/pam_appl.h>

     int
     pam_get_user(pam_handle_t *pamh, const char **user, const char *prompt);

DESCRIPTION

     The pam_get_user function returns the name of the target user, as specified to pam_start(3).  If no user was specified, nor set using
     pam_set_item(3), pam_get_user will prompt for a user name.  Either way, a pointer to the user name is stored in the location pointed to by
     the user argument.

     The prompt argument specifies a prompt to use if no user name is cached.  If it is NULL, the PAM_USER_PROMPT item will be used.  If that item
     is also NULL, a hardcoded default prompt will be used.  Either way, the prompt is expanded using openpam_subst(3) before it is passed to the
     conversation function.

     If pam_get_user is called from a module and the user_prompt option is set in the policy file, the value of that option takes precedence over
     both the prompt argument and the PAM_USER_PROMPT item.

RETURN VALUES

     The pam_get_user function returns one of the following values:

     [PAM_BUF_ERR]	 Memory buffer error.

     [PAM_CONV_ERR]	 Conversation failure.

     [PAM_SYSTEM_ERR]	 System error.

SEE ALSO

     openpam_subst(3), pam(3), pam_get_authtok(3), pam_get_item(3), pam_set_item(3), pam_start(3), pam_strerror(3)

STANDARDS

     X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules, June 1997.

AUTHORS

     The pam_get_user function and this manual page were developed for the FreeBSD Project by ThinkSec AS and Network Associates Laboratories, the
     Security Research Division of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (``CBOSS''), as part of the DARPA CHATS
     research program.

BSD
								 December 18, 2011							       BSD