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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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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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