Re: encryption
On 04/21/18 11:14, Brian wrote:
On Sat 21 Apr 2018 at 11:36:05 -0500, David Wright wrote:
If so, then won't the password be revealed by ps while eval is
evaluating it?
I do not know the most efficacious way to see the ps output in real time
as eval runs. With a bit of trial and error (scrypt is slow enough to
switch to another console and use ps) I captured
23266 pts/7 R+ 0:00 mpw -q -F -M -t railcard
in its output. mpw is the basic command executed by myscript. Switches
are shown but not parameters. -M is the very important one. The gap
would be occupied by the passphrase.
Is it possible that ps output does not show parameters to switches?
The -f option for ps(1) appears to display options and option values:
2018-04-21 13:47:04 dpchrist@vstretch ~/sandbox/sh
$ cat /etc/debian_version
9.4
2018-04-21 13:47:06 dpchrist@vstretch ~/sandbox/sh
$ uname -a
Linux vstretch 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02)
x86_64 GNU/Linux
2018-04-21 13:47:09 dpchrist@vstretch ~/sandbox/sh
$ cat ps-option-values
perl -e '$| = 1; print "hello\n"; sleep 3; print "world!\n"' &
ps $@
2018-04-21 13:47:11 dpchrist@vstretch ~/sandbox/sh
$ dash ps-option-values -f
hello
UID PID PPID C STIME TTY TIME CMD
dpchrist 1681 1268 0 11:42 pts/1 00:00:00 -bash
dpchrist 3276 1681 0 13:47 pts/1 00:00:00 dash ps-option-values -f
dpchrist 3277 3276 0 13:47 pts/1 00:00:00 perl -e $| = 1; print
"hello\n"; sleep 3; print "world!\n"
dpchrist 3278 3276 0 13:47 pts/1 00:00:00 ps -f
2018-04-21 13:47:13 dpchrist@vstretch ~/sandbox/sh
$ world!
2018-04-21 13:47:17 dpchrist@vstretch ~/sandbox/sh
$ bash ps-option-values -f
hello
UID PID PPID C STIME TTY TIME CMD
dpchrist 1681 1268 0 11:42 pts/1 00:00:00 -bash
dpchrist 3285 1681 0 13:47 pts/1 00:00:00 bash ps-option-values -f
dpchrist 3286 3285 0 13:47 pts/1 00:00:00 perl -e $| = 1; print
"hello\n"; sleep 3; print "world!\n"
dpchrist 3287 3285 0 13:47 pts/1 00:00:00 ps -f
2018-04-21 13:47:20 dpchrist@vstretch ~/sandbox/sh
$ world!
David
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