01-25-2011
Thanks for these helpful information.
So, if it's using /dev/tty* why we can't redirect it? ("is kind of 'magic'"!)
Assume that we create a link from /dev/tty* to /dev/stdout and then handle it like any other output of stdout, isn't it possible?
Just as a Clarification:
Quote:
- Our system has no GUI! It's text-based.
- Just one tty is in use [,Logged on].
- We will use SSH for connecting to another machine.
Q1: How we can log any single character which appeares on the screen?
A1: Some tools like SSH, directly open the controlling terminal and not using stdin/stdout/stderr for their output (e.g: /dev/tty) so, it's not possible to redirect the output using common ways.
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RBASH(1) General Commands Manual RBASH(1)
NAME
rbash - restricted bash, see bash(1)
RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO
bash(1)
GNU Bash-4.0 2004 Apr 20 RBASH(1)