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1. UNIX for Dummies Questions & Answers
I have a function that outputs 3 lines for each result and I want to know how many results there are.
so for example
function | wc -l
24
but I want to see the result 8.
so is there a easy way to divide the result? (5 Replies)
Discussion started by: yatici
5 Replies
2. UNIX for Dummies Questions & Answers
hi,
The below commands result only the whole number(not giving the decimal values).
pandeeswaran@ubuntu:~$ echo 1,2,3,4|sed 's/,/\//g'|bc
0
pandeeswaran@ubuntu:~$ echo 1000,2,3|sed 's/,/\//g'|bc
166
How to make it to return the decimal values?
Thanks (5 Replies)
Discussion started by: pandeesh
5 Replies
3. Shell Programming and Scripting
input
one two three four
0 0 0 10424
0 102 0 15091
1 298 34 11111
0 10 0 1287
scripts
awk 'NR>1{print ($1/$2) / ($3/$4)}'
awk 'NR>1{ if ($1 ||$3 ||$2|| $4 == 0) print 0; else print (($1/$2)/($3/$4))}'
error
awk: division by zero
input record number 1, file rm
source line... (9 Replies)
Discussion started by: quincyjones
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4. UNIX for Advanced & Expert Users
I received error "awk: division by zero" while executing the following statement.
SunOS 5.10 Generic_142900-15 sun4us sparc FJSV,GPUZC-M
echo 8 | awk 'END {printf ("%d\n",NR/$1 + 0.5);}' file1.lst
awk: division by zero
Can someone provide solution?
Thanks
Please use code... (11 Replies)
Discussion started by: kumar77
11 Replies
5. Shell Programming and Scripting
Hello,
I am searching for a way to calculate for example 10/100 within a shellscript and the result should be 0.1 and not just 0.
Every alternative i tried just results 0
Thank you in advance
2retti (6 Replies)
Discussion started by: 2retti
6 Replies
6. Shell Programming and Scripting
Hi Everyone,
a.txt
line1;a;33
line1;c;22
line1;b;0
line1;a;55
a.pl
#!/usr/bin/perl
use strict;
use warnings;
my @sorted=();
my @tmp;
my $FA;
my @F; (0 Replies)
Discussion started by: jimmy_y
0 Replies
7. Shell Programming and Scripting
i have a script that is doing the following:
awk 'BEGIN {FS=","} ; {printf("%.10f",($5 - $2)/(3 * $3))}' data > test
now some records in $3 contain zeroes. i don't want to remove those records. is it possible to check for division by zero and then write a "N/A" for that record in the o/p... (2 Replies)
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8. Shell Programming and Scripting
Hi,
I am writing a script that among other things will be checking for various files on mount points. One of the conditions is that unless the server has failed over the df command will show root ( / ). If when checking the files the script comes across /, I want it to skip it, otherwise to... (2 Replies)
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I have a doubt with an error message, and i want to be sure if this is a normal situation or not.
Situation: I was formating and installing a SCSI 36Gb HD with UNIX SCO 5.05, the problem happens when is making the division and filesystem on disk 1, and the message error is "Exit value 139... (1 Reply)
Discussion started by: jav_v
1 Replies
10. Shell Programming and Scripting
how can i show the value when i divide a number where the dividend is greater then the divisor. for example...
3 divided by 15 ---> let x=3/15
when i do this in the shell environment it gives me an output of 0.
please help me.
thanks. (3 Replies)
Discussion started by: inquirer
3 Replies
expr(1B) SunOS/BSD Compatibility Package Commands expr(1B)
NAME
expr - evaluate arguments as a logical, arithmetic, or string expression
SYNOPSIS
/usr/ucb/expr argument...
DESCRIPTION
The expr utility evaluates expressions as specified by its arguments. After evaluation, the result is written on the standard output. Each
token of the expression is a separate argument, so terms of the expression must be separated by blanks. Characters special to the shell
must be escaped. Note: 0 is returned to indicate a zero value, rather than the null string. Strings containing blanks or other special
characters should be quoted. Integer-valued arguments may be preceded by a unary minus sign. Internally, integers are treated as 32-bit,
two's-complement numbers.
The operators and keywords are listed below. Characters that need to be escaped are preceded by `'. The list is in order of increasing
precedence, with equal precedence operators grouped within {} symbols.
expr | expr
Returns the evaluation of the first expr if it is neither NULL nor 0; otherwise, returns the evaluation of the second expr if it is not
NULL; otherwise, 0.
expr & expr
Returns the first expr if neither expr is NULL or 0, otherwise returns 0.
expr { =, , , <, <=, != } expr
Returns the result of an integer comparison if both arguments are integers, otherwise returns the result of a lexical comparison.
expr { +, - } expr
Addition or subtraction of integer-valued arguments.
expr { , /, % } expr
Multiplication, division, or remainder of the integer-valued arguments.
string : regular-expression
match string regular-expression
The two forms of the matching operator above are synonymous. The matching operators : and match compare the first argument with the
second argument which must be a regular expression. Regular expression syntax is the same as that of regexp(5), except that all pat-
terns are "anchored" (treated as if they begin with ^) and therefore ^ is not a special character, in that context. Normally, the
matching operator returns the number of characters matched (0 on failure). Alternatively, the ... pattern symbols can be used to
return a portion of the first argument.
substr string integer-1 integer-2
Extracts the substring of string starting at position integer-1 and of length integer-2 characters. If integer-1 has a value greater
than the length of string, expr returns a null string. If you try to extract more characters than there are in string, expr returns all
the remaining characters from string. Beware of using negative values for either integer-1 or integer-2 as expr tends to run forever
in these cases.
index string character-list
Reports the first position in string at which any one of the characters in character-list matches a character in string.
length string
Returns the length (that is, the number of characters) of string.
( expr )
Parentheses may be used for grouping.
EXAMPLES
Example 1 Adding an integer to a shell variable
Add 1 to the shell variable a.
a='expr $a + 1'
Example 2 Returning a path name segment
Return the last segment of a path name (that is, the filename part). Watch out for / alone as an argument: expr will take it as the divi-
sion operator (see BUGS below).
# 'For $a equal to either "/usr/abc/file" or just "file"'
expr $a : '.*/ $a
Example 3 Using // characters to simplify the expression
The addition of the // characters eliminates any ambiguity about the division operator and simplifies the whole expression.
# A better representation of example 2.
expr //$a : '.*/
Example 4 Returning the value of a variable
Returns the number of characters in $VAR.
expr $VAR : '.*'
EXIT STATUS
expr returns the following exit codes:
0 If the expression is neither NULL nor 0.
1 If the expression is NULL or 0.
2 For invalid expressions.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
sh(1), test(1), attributes(5), regexp(5)
DIAGNOSTICS
syntax error for operator/operand errors
non-numeric argument if arithmetic is attempted on such a string
division by zero if an attempt to divide by zero is made
BUGS
After argument processing by the shell, expr cannot tell the difference between an operator and an operand except by the value. If $a is an
=, the command:
expr $a = '='
looks like:
expr = = =
as the arguments are passed to expr (and they will all be taken as the = operator). The following works:
expr X$a = X=
Note: the match, substr, length, and index operators cannot themselves be used as ordinary strings. That is, the expression:
example% expr index expurgatorious length
syntax error
example%
generates the `syntax error' message as shown instead of the value 1 as you might expect.
SunOS 5.11 6 Jun 2000 expr(1B)