10-05-2010
sftp reads the password from /dev/tty, so you need a tool that creates a psuedo tty like expect or even ssh localhost. It is better to set up the keys and not have any password, usually.
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LEARN ABOUT REDHAT
getpass
GETPASS(3) Linux Programmer's Manual GETPASS(3)
NAME
getpass - get a password
SYNOPSIS
#include <unistd.h>
char *getpass( const char * prompt );
DESCRIPTION
This function is obsolete. Do not use it.
The getpass() function opens /dev/tty (the controlling terminal of the process), outputs the string prompt, turns off echoing, reads one
line (the "password"), restores the terminal state and closes /dev/tty again.
RETURN VALUE
The function getpass returns a pointer to a static buffer containing the (first PASS_MAX bytes of) the password without the trailing new-
line, terminated by a NUL. This buffer may be overwritten by a following call. On error, the terminal state is restored, errno is set
appropriately, and NULL is returned.
ERRORS
The function may fail if
ENXIO The process does not have a controlling terminal.
NOTES
For libc4 and libc5, the prompt is not written to /dev/tty but to stderr. Moreover, if /dev/tty cannot be opened, the password is read
from stdin. The static buffer has length 128 so that only the first 127 bytes of the password are returned. While reading the password,
signal generation (SIGINT, SIGQUIT, SIGSTOP, SIGTSTOP) is disabled and the corresponding characters (usually control-C, control-, control-
Z and control-Y) are transmitted as part of the password. Since libc 5.4.19 also line editing is disabled, so that also backspace and the
like will be seen as part of the password.
For glibc2, if /dev/tty cannot be opened, the prompt is written to stderr and the password is read from stdin. There is no limit on the
length of the password. Line editing is not disabled.
According to the SUSv2, the value of PASS_MAX must be defined in <limits.h> in case it is smaller than 8, and can in any case be obtained
using sysconf(_SC_PASS_MAX). However, POSIX.2 withdraws the constants PASS_MAX and _SC_PASS_MAX, and the function getpass (). Libc4 and
libc5 have never supported PASS_MAX or _SC_PASS_MAX. Glibc2 accepts _SC_PASS_MAX and returns BUFSIZ (e.g., 8192).
FILES
/dev/tty
SEE ALSO
crypt(3)
HISTORY
A getpass function appeared in Version 7 AT&T UNIX.
BUGS
The calling process should zero the password as soon as possible to avoid leaving the cleartext password visible in the process's address
space.
Linux Manpage 2000-12-05 GETPASS(3)