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Top Forums Shell Programming and Scripting Calculate the performance of employee Post 303037699 by wisecracker on Friday 9th of August 2019 01:53:27 PM
Old 08-09-2019
Quote:
Originally Posted by rohit_shinez
Agree to that, But would more keen on bash scripting for learning purpose
I have already stated that bash ONLY has integer maths, so let's see its limitations:
Code:
q1=6; q2=7; q3=5; q4=7
av1=$(( (q1+q2+q3+q4)/4 ))
echo "$av1"
# Gives the result 6. WRONG! The REAL answer is 6.25.

(<CR> is the ENTER key.)
Try this example in bash: echo $(( 3/4 ))<CR> and see the result as 0, ZERO, NOT 0.75!
Now try this in bash: NUM=$(( 3/4 )); if [ "${NUM}" -le "0.75" ]; then echo "True!"; else echo "False!"; fi<CR>
Do you see where the next step goes?
Utilities are needed for any floating point requirements.
Now try this utility, which I guess you already have: NUM=$( python -c "print(3.0/4.0)" ); echo "${NUM}"<CR> ; yes this works on Python 2.x.x and 3.x.x.
You now have your floating point number - BUT - how do you compare knowing there is an error report saying:
-bash: [: 0.75: integer expression expected ...
Now ksh is a different animal, similar to bash but has full floating point and integer maths capability and with a little work can create something like this little beauty:
DFT using pure ksh ONLY!

Last edited by wisecracker; 08-09-2019 at 04:24 PM.. Reason: Correct error report...
 

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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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