Startup Files in Unix Post: 302529489

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Top Forums UNIX for Dummies Questions & Answers Startup Files in Unix Post 302529489 by Corona688 on Thursday 9th of June 2011 11:50:32 AM

06-09-2011

Registered User

"what car do you have?" "blue"
"what shell do you have?" "bourne"

Knowing you have a mac tells me you have bash, otherwise we'd have to guess.

From man bash:

Code:

...
INVOCATION
       A login shell is one whose first character of argument zero is a -,  or
       one started with the --login option.

       An  interactive  shell  is one started without non-option arguments and
       without the -c option whose standard input and error are both connected
       to  terminals  (as determined by isatty(3)), or one started with the -i
       option.  PS1 is set and $- includes i if bash is interactive,  allowing
       a shell script or a startup file to test this state.

       The  following paragraphs describe how bash executes its startup files.
       If any of the files exist but cannot be read, bash  reports  an  error.
       Tildes are expanded in file names as described below under Tilde Expan-
       sion in the EXPANSION section.

       When bash is invoked as an interactive login shell, or as a  non-inter-
       active  shell with the --login option, it first reads and executes com-
       mands from the file /etc/profile, if that file exists.   After  reading
       that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile,
       in that order, and reads and executes commands from the first one  that
       exists  and  is  readable.  The --noprofile option may be used when the
       shell is started to inhibit this behavior.

       When a login shell exits, bash reads and  executes  commands  from  the
       file ~/.bash_logout, if it exists.

       When  an  interactive  shell that is not a login shell is started, bash
       reads and executes commands from ~/.bashrc, if that file exists.   This
       may  be inhibited by using the --norc option.  The --rcfile file option
       will force bash to read and  execute  commands  from  file  instead  of
       ~/.bashrc.

       When  bash  is  started  non-interactively,  to run a shell script, for
       example, it looks for the variable BASH_ENV in the environment, expands
       its  value if it appears there, and uses the expanded value as the name
       of a file to read and execute.  Bash behaves as if the  following  com-
       mand were executed:
              if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
       but  the  value of the PATH variable is not used to search for the file
       name.
...

Also, /etc/profile and so forth are all script files, not just dumb settings files. It's entirely possible for them to tell the shell to source other files too.

Corona688

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LEARN ABOUT X11R4

open

OPENVT(1)                                                            Linux 1.x                                                           OPENVT(1)

NAME

       openvt - start a program on a new virtual terminal (VT).

SYNOPSIS

       openvt [-c vtnumber] [OPTIONS] [--] command

DESCRIPTION

       openvt  will  find the first available VT, and run on it the given command with the given command options, standard input, output and error
       are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified  then  the
       environment variable $SHELL is used.

   OPTIONS
       -c, --console=VTNUMBER
              Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work;

       -f, --force
              Force opening a VT without checking whether it is already in use;

       -e, --exec
              Directly execute the given command, without forking.  This option is meant for use in /etc/inittab.  If you want to use this feature
              in another context, be aware that openvt has to be a session leader in order for -e to work.  See setsid(2) or setsid(1) on  how  to
              achieve this.

       -s, --switch
              Switch to the new VT when starting the command. The VT of the new command will be made the new current VT;

       -u, --user
              Figure out the owner of the current VT, and run login as that user.  Suitable to be called by init. Shouldn't be used with -c or -l;

       -l, --login
              Make the command a login shell. A - is prepended to the name of the command to be executed;

       -v, --verbose
              Be a bit more verbose;

       -w, --wait
              wait  for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com-
              mand completes;

       -V, --version
              print program version and exit;

       -h, --help
              show this text and exit.

       --     end of options to openvt.

NOTE

       If openvt is compiled with a getopt_long() and you wish to set options to the command to be run, then you must supply the end of options --
       flag before the command.

EXAMPLES

       openvt can be used to start a shell on the next free VT, by using the command:

       openvt bash

       To start the shell as a login shell, use:

       openvt -l bash

       To get a long listing you must supply the -- separator:

       openvt -- ls -l

HISTORY

       Earlier, openvt was called open.  It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>.  The -w idea is from "sam".

SEE ALSO

       chvt(1), doshell(8), login(1)

19 Jul 1996                                                            V1.4                                                              OPENVT(1)