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Top Forums Shell Programming and Scripting Guidance required in .profile Post 303037385 by apmcd47 on Wednesday 31st of July 2019 04:47:38 AM
Old 07-31-2019
Quote:
Originally Posted by cokedude
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?
So basically you are asking, "is my login shell bash or ksh?" And if there is no bash on your system it will be ksh, because that is the default, else you will have changed it by the time your regular .profile has been installed. Your SHELL variable will be set to your login shell and bash, from version 2 at least, will have the BASH_VERSION variable. So, either:
Code:
[ -n "$BASH_VERSION" ] && . ./.bashrc

or
Code:
case "$SHELL" in
*bash) . ./.bashrc ;;
*ksh) . ./.kshrc ;;
esac

should do it.
Quote:
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

POSIX shell and older shells don't support the double square bracket operator; and the single square bracket operator doesn't support the && and || operators. Personally, I think it's more readable to keep one expression per square bracket operator, whether it is single or double.

Andrew
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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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