05-08-2009
'who' command -- getting data returned into variables (in bash)
Anyone know how to get the data out of the "who" command?
I'm still in lukewarm pursuit of creating an OS X-like welcome message at the start of any Terminal session,
sans having to use either bash login or calling up ssh.
My trials & errors and surfing around have narrowed it down for me somewhat. The 'who' command appears to return a string of the exact kind of data I would like to break up and re-arrange into part of the welcome. I just haven't puzzled out how to 'pull' this returned data, break it up and set variables to the three different 'fields' the command provides (USER, TIME and COMMENT), such that they can be placed in the right positions of a string like
Quote:
Welcome, User.
Last login was on May 1 17:55 from (: 0)
(Of course, in place of "User" would be my own name, as the only user logged in via my startup script.)
Considered responses are welcome.
BZT
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LEARN ABOUT OPENDARWIN
chsh
CHSH(1) User Commands CHSH(1)
NAME
chsh - change login shell
SYNOPSIS
chsh [options] [LOGIN]
DESCRIPTION
The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
the login shell for her own account; the superuser may change the login shell for any account.
OPTIONS
The options which apply to the chsh command are:
-h, --help
Display help message and exit.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
-s, --shell SHELL
The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.
If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.
NOTE
The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
back to its original value.
FILES
/etc/passwd
User account information.
/etc/shells
List of valid login shells.
/etc/login.defs
Shadow password suite configuration.
SEE ALSO
chfn(1), login.defs(5), passwd(5).
shadow-utils 4.5 01/25/2018 CHSH(1)