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read -sp xx displays xx before disabling echo.
From: |
Stephane Chazelas |
Subject: |
read -sp xx displays xx before disabling echo. |
Date: |
Fri, 05 Oct 2007 16:40:18 +0100 |
Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I../bash -I../bash/include -I../bash/lib -g -O2
uname output: Linux xxxxxxxxxx 2.6.23-rc6 #1 PREEMPT Sat Sep 15 16:31:30 BST
2007 i686 GNU/Linux
Machine Type: i486-pc-linux-gnu
Bash Version: 3.1
Patch Level: 17
Release Status: release
Description:
(same in 3.2.25)
This is a very minor issue.
in read -p some-prompt -s password
The prompt is issued before the terminal echo is disabled, so that the
user may start typing before the echo is disabled and his password
become visible.
Here, 2 in 3 executions of:
expect -c 'spawn bash -c "read -sp asd:; echo @"; expect "asd:"; send
"blah\r"; expect "@"'
actually displays "blah"
$ strace bash -c 'read -sp asd'
[...]
write(2, "asd", 3asd) = 3
[...]
ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon -echo
...}) = 0
[...]
read(0,
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- read -sp xx displays xx before disabling echo.,
Stephane Chazelas <=