02-12-2008
Unix Arithmatic operation issue , datatype issue
Hi,
I have a shell scripting. This will take 7 digit number in each line and add 7 digit number with next subsequent lines ( normal addition ).
Eg:
0000001
0000220
0001235
0000022
0000023
...........
.........
........
Like this i am having around 1500000 records. After adding , I am getting the result 2147483647 but actual result is 2156379608 . I found the root cause of this issue is that Unix temproary variable can hold only 2156379608 ( Range of integer ) as it's 32 bit. For eg:
a=2147483647
expr $a + 2
you will get the negative result. Because while expr working, the result will be stored in internal temporary variable or register then you will get the result.. but that particular temporary variable or register can accomodate only 2147483647 .. if it crosses this limit, you may get the junk value like -ve values... this is my finiding for this issue.. But I want to have resolution for this issue. how to add or do arthimatic opration if i want to have result more than limit ( 2147483647 ). I mean
a=2147483647
expr $a + 2
for this i need to get the right result rather than -ve value.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi all,
Something funny happen with this code:
EXIST=`ssh batch@190.2.332.234 'if ; then echo 0; else echo 1 ; fi'`
echo $EXIST
Above code will display "1".
The value of remotePath is /home/batch
The value of fileName is sample.txt
=========================================
... (1 Reply)
Discussion started by: suigion
1 Replies
2. UNIX for Dummies Questions & Answers
In LINUX(CentOS, RedHat) is there a way to have the banner statement appear before the logon instead of after the logon? In UNIX and Windows the banner appears before a person actually logs on, what I'm seeing in LINUX is that it appears after the login(ftp, telnet, SSH).
Thanks (0 Replies)
Discussion started by: ejjones
0 Replies
3. Shell Programming and Scripting
Hi All,
I am trying to sort the below data using sort command.
temp.dat
H|S1-511091486889|27-Jul-2011 00:00:00
H|S1-511091486823|27-Jul-2011 00:00:00
H|S1-511091486757|27-Jul-2011 00:00:00
L|S1-511091486889|1
L|S1-511091486823|1
L|S1-511091486757|1
sort -t "|" -k2 -k1 temp.dat
My... (5 Replies)
Discussion started by: deepaknbk
5 Replies
4. Shell Programming and Scripting
Hello everyone, I'm in need of some assistance. I'm currently enrolled in an introductory UNIX shell programming course and, well halfway through the semester, we are receiving our first actual assignment. I've somewhat realized now that I've fallen behind, and I'm working to get caught up, but for... (1 Reply)
Discussion started by: MrMagoo22
1 Replies
5. Windows & DOS: Issues & Discussions
Hi,
I'm having a nightmare of a time with this one. I've recently taken over a sys admin role and shortly after I did, the print server failed. I've had to replace the hard disk. ---don't ask about backups....there hasn't been a sys admin in post for almost a year......
Anyway, the aim, to... (0 Replies)
Discussion started by: rudigarude
0 Replies
6. Shell Programming and Scripting
Hi,
There is a user in Solaris-10 zone, ora_big01. Its .profile is not getting executed due to some reason and I am not able to find that.
root@trddpd-dwsq04:/# cat /etc/passwd | grep -i ora_big01
ora_big01:x:242349:220:Siebel for QA:/ccq/apps/siebel:/usr/bin/ksh
root@trddpd-dwsq04:/# which ksh... (3 Replies)
Discussion started by: solaris_1977
3 Replies
7. Shell Programming and Scripting
Hi All,
I am using the below script which has awk command, but it is not returing the expected result. can some pls help me to correct the command.
The below script sample.ksh should give the result if the value of last 4 digits in the variable NM matches with the variable value DAT. The... (7 Replies)
Discussion started by: G.K.K
7 Replies
8. UNIX for Advanced & Expert Users
Hi,
Not entirely sure if this is the right thread.
Essentially, fdisk -l shows that /dev/sda is a drive (750 GB), with 1 partition at /dev/sda1 with system type "Linux".
I'm pretty nooby at working with drives, but I'm pretty sure that the output of:
mount /dev/sda1 /media/int
Should not... (4 Replies)
Discussion started by: FreddoT
4 Replies
9. Shell Programming and Scripting
Hi
I am trying to do a "IF" Condition in UNIX where we compare EACH file size in a directory with a SIZE (Parameter passed)
If Each File size EXCEEDS parameter passed SIZE then we manipulate the file.
Somehow the IF condition do not work ?? (is this Variable decalration issue ??)
... (9 Replies)
Discussion started by: Pete.kriya
9 Replies
10. Shell Programming and Scripting
Hi all,
I have tried to send an email with the below script. but i am not getting the subject of the email where it is present in the simply.txt.
I am using HP UNIX server.
I am not sure what mistake i made in the below unix command. any help would be appreciated.
cat simply.txt ... (2 Replies)
Discussion started by: arun888
2 Replies
LEARN ABOUT OPENSOLARIS
expr
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)