03-05-2008
That is ksh the (( .. )) construct: it is equivalent to let for arithmetic operations.
$(( .. )) lets you assign the result to a variable.
see man ksh for more information.
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi ,
I have a doubt on condition test ( ] ). Pls refer blow program.
#!/bin/ksh
TEMP=
if ;then
echo $TEMP
else
print 'invalid option'
fi
Above script's TEMP variable has no value so it gives "invalid option" as output. But I got an error before priting the string .
Result :
... (2 Replies)
Discussion started by: thambi
2 Replies
2. Shell Programming and Scripting
I jus want to know the meaning of the below command line(exclamation following that re-direction)
sqlplus -s `cat /home/sample.txt` <<!
Thanks!! (1 Reply)
Discussion started by: nohup
1 Replies
3. HP-UX
Executed the following if conditions .. and got different results .
only (( )) gave correct o/p with all scenarios .
Can anybody please let me know what is the difference between and ] and ((condition)) when used with if condition.
And why each condition gave different result.
1.... (2 Replies)
Discussion started by: soumyabubun
2 Replies
4. Shell Programming and Scripting
hi,
I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command
Here are my simple script
After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
Discussion started by: jao_madn
3 Replies
5. Red Hat
I need help in opening the .exe files in linux. As i have downloaded ubuntu os from trail version.
after executing the the file name in terminal it is stating that get archive files for opening the .exe files.
But i am unable to get it
please help me (2 Replies)
Discussion started by: yashwanthguru
2 Replies
6. Ubuntu
hi ,, i am new for this.. i want to know abt linux os.. which version is best for it industry.. please suggest me..:cool: (1 Reply)
Discussion started by: c vignesh kumar
1 Replies
7. Shell Programming and Scripting
Hi experts,
In one of our code we have used some command like this.
name=${name##*/}
Can someone please let me know what exactly it does?
Thanks & Regards,
Sathya V. (1 Reply)
Discussion started by: Sathya83aa
1 Replies
8. Shell Programming and Scripting
HI
My doubt may be basic one but I need to get it clarified..
When i use "if" condition that checks for many AND, OR logical conditions
like
if ]; then
return 0
fi
Even the if condition fails it returns as zero.. Any clue..
But if i add else condition like
if ]; ... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies
9. Shell Programming and Scripting
hi.,
As we know that using for-loop or while condition, we can only process one by one sequentially, but , lets say this example :
1. under the folder "logs" there are 1000 files
2. each file has one record or line
3. have to perform atleast 7 queries per 3 seconds ,for instance
... (3 Replies)
Discussion started by: alnhk
3 Replies
shift(1) User Commands shift(1)
NAME
shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words
SYNOPSIS
sh
shift [n]
csh
shift [variable]
ksh
* shift [n]
DESCRIPTION
sh
The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.
csh
The components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
not to be set or to have a null value.
ksh
The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can be any arithmetic expression that
evaluates to a non-negative number less than or equal to $#.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 15 Apr 1994 shift(1)