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Full Discussion: Guidance required in .profile
Top Forums Shell Programming and Scripting Guidance required in .profile Post 303037353 by cokedude on Tuesday 30th of July 2019 10:12:55 AM
Old 07-30-2019
Quote:
Originally Posted by apmcd47
The problem with the above is, if bash exists but you are not running bash, your shell will baulk at an instruction in the .bashrc file.

Try something like this at the end of your .profile:
Code:
if [ -z "$BASH_VERSION" ] 
then
   if [ -x /usr/bin/bash ]
   then
      SHELL=/usr/bin/bash
      export SHELL
      exec $SHELL
   elif [ -x /bin/bash ]
   then
      SHELL=/bin/bash
      export SHELL
      exec $SHELL
   fi
fi

This way, if bash exists, but is not your login shell, your shell will switch to bash at the end of the .profile. You can also add a test for bash being in /usr/local/bin.

Andrew
Bash is thankfully my default shell. I was trying to solve the problem of when bash does not exist. Ksh is the system default but I changed my personal default to bash. How would I fall back to ksh if bash does not exist?

Quote:
Originally Posted by Don Cragun
One could also portably use:
Code:
if [ -s ~/.bashrc ] && [ -s /usr/bin/bash ]; then

Although && isn't a test (or [ ... ]) utility operator, it is a shell operator.
Do older systems not like this? Is that what you were saying with portably?

Code:
if [[ -s ~/.bashrc && /usr/bin/bash ]]; then
    #echo hi
    source ~/.bashrc;
fi

 

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LEARN ABOUT DEBIAN

surfraw-update-path

SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME

       surfraw-update-path - updates PATH in shell config files

SYNOPSIS

       surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL]

DESCRIPTION

       surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file.

       Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es

       Don't forget to login again or source your login files for it to take effect.

OPTIONS

       -check
	   Checks to see if the surfraw config code is present.  This is the default.

       -add
	   Adds the surfraw config code.

       -remove
	   Removes the surfraw config code

       -sys
	   Updates the system-wide shell config instead of the user.  Must be done as root.

       -shell=SHELL
	   Selects the shell to configure. Defaults to the value of the $SHELL environment variable.

	   Currently supported shells are:

	   sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es.

       -all
	   Attempts to configure the startup files for all known shells

       -help
	   Gives a usage message

RETURN VALUE

       -check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error.

       All other options return 0 on success, or 2 on error.

ENVIRONMENT

       SHELL
	   Used to determine which shell to configure, if -shell is not given.

       HOME
	   Used to find users config files.

       ENV Used by posix-compliant shells to specify a startup rc file.

       ZDOTDIR
	   Used to find user config files for zsh. If not set, defaults to HOME.

SEE ALSO

       surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1)

AUTHOR

       Ian Beckwith <ianb@erislabs.net>

perl v5.12.4							    2011-07-12						    SURFRAW-UPDATE-PATH(1)
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