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:
(<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...
Hi ,
this is the first time i use bc to calculate and i would have decimal result , i use the following :
toto=400;scale=1 echo $toto / 1000|bc
scale to adjust the numbers after the command would have in this case 0.4 as result and i wonder why i have always 0 as result.
Somebody can... (2 Replies)
I was wondering can anyone give me a clue how to start script which would do the following:
I have 2 numbers as input for example: 100 and 1000 and I need to create file and in that file should be written
100 - 199
200 - 299
300 - 399
400 - 499
500 - 599
600 - 699
700 - 799... (3 Replies)
About 4 years ago I wrote this tool inspired by Rob Urban's collect tool for DEC's Tru64 Unix. What makes this tool as different as collect was in its day is its ability to run at a low overhead and collect tons of stuff. I've expanded the general concept and even include data not available in... (0 Replies)
Hi everyone,
I need to write a script to calculate the space for sub-folders under /home:
Here is the scanrio:
cd /home
drwxr-xr-x 57 root root 8192 Jan 22 16:13 home_1
drwxrwxrwx 69 root root 8192 Jan 29 10:36 home_2
drwxr-xr-x 97 root root 8192 Nov... (8 Replies)
i have 3 files like
total.dat=18
equal.dat=14
notequal.dat=16
i need find the equal percentange means:
equalpercentage = ($equal.dat / $total.dat * 100)
How i can do this ?
I tried some of the answers to calculate the percentage in this forums.but it couldn't worked.Some one please... (6 Replies)
I have 2 variables in my shell scripts in which i am using awk and calculating 2 files and getting 2 different variable called in_total and out_total. I want to subtract one variable from another so plz tell me how i can do that.
Example is:
cat in_file | awk -F: '{
in_total += $1 * 86400... (3 Replies)
Hello,
I'm trying to create a shell script (#!/bin/sh) which should tell me the age of a file in minutes...
I have a process, which delivers me all 15 minutes a new file and I want to have a monitoring script, which sends me an email, if the present file is older than 20 minutes.
To do... (10 Replies)
i have file input
abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31
fsdasdf|ferg|12|04|25|21|21|A1|13|02|26|20|31
dfsfsad|gerg|12|04|25|21|21|A1|13|02|25|25|31
i expect the output
abcedef|wert|13|03|10|04|23|A1|13|05|01|09|31|9.516666667... (5 Replies)
If there are 2 records for an Employee, How can I choose the one with eff_status = ‘Active' and ignore the eff_status ='Terminated'. if there is only one record, then just write that record regardless of the eff_status.
Please assist. (1 Reply)
Discussion started by: Harimalyala
1 Replies
LEARN ABOUT OPENSOLARIS
echo
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)