03-25-2019
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
Is there a way to evaluate an equation contained in a string within an AWK script?
For example:
A = "(5*2)-1" (this equation is read from a file and varies line by line)
In this example, I can't see any way to get an answer of 9 unless I do:
cmd = "awk 'BEGIN{print "A"}'"
cmd |... (3 Replies)
Discussion started by: srdgeo
3 Replies
2. Shell Programming and Scripting
Hi -
I have an expression that evaluates to "Alive" or some other condition. e.g. if I run :-
awk -F \| '{gsub(/]*/,"",$4); print $4 }'
then the output is "Alive".
I want to be able to test this as the result may be some other condition other than "Alive". I have tried the following... (4 Replies)
Discussion started by: sniper57
4 Replies
3. UNIX for Dummies Questions & Answers
I know this should be simple, but sorry I am fairly new to UNIX and can't find the syntax to make this work.
I have the following two commands in a script:
x=`expr $(head -1 filename.ext | cut -c16 | grep | wc -l) + 16`
del=`head -1 filename.ext | cut -c$x`
This works fine as I expect... (2 Replies)
Discussion started by: DJR
2 Replies
4. UNIX for Dummies Questions & Answers
Hi all!
I'm writting one script to copy a file in various folders, but there are 2 things to validate. First that the folder where i'll be cpying exists, and second that i have permissions to copy the file in it.
so far i have found the way to validate the folder exists, but when trying to... (6 Replies)
Discussion started by: feliperivera
6 Replies
5. Cybersecurity
Hello guys,
I'm actually working on my master thesis which has for subject the evaluation of virtual firewall in a cloud environment. To do so, I installed my own cloud using OpenNebula (as a frontend) and Xen (as a Node) on two different machines. The Xen machine is my virtual firewall thanks... (2 Replies)
Discussion started by: Slaughterman
2 Replies
6. Shell Programming and Scripting
I'm building a script that may received start and end date as parameters. I whant to make it as flexible as possible so I'm accepting epoch and date in a way that "date --date=" command may accept. In order to know if parameter provided is an epoc or a "date --date=" string I evaluate if the value... (2 Replies)
Discussion started by: lramirev
2 Replies
7. Shell Programming and Scripting
I have made a simple script to find all programs that use a tcp wrapper, it will supply a reasonable default for my system if none is given.
After some digging I realized that the expansion operators pass their default return value single quoted (according to bash -x trace). I have wildcard... (0 Replies)
Discussion started by: Riker1204
0 Replies
8. AIX
Hello,
IBM offers a evaluation version of their XL C/C++ compiler. Unfortunatly v16.1 (from Developerworks) can not be installed on AIX 5.3 (I can not upgrade my old 32 Bit RS/6000 to a later version) and I have not found any older versions on the IBM and Developerworks pages.
Is there a... (8 Replies)
Discussion started by: eh2scqw
8 Replies
9. Shell Programming and Scripting
Could somebody please explain to me why and how the highlighted line(s) (?) of code puts the "test" evaluation into "result" and then to $enable_static ? Or does not ?
I did comment out the original code and changed it to what I feel is less cryptic , but the "result" is still wrong =... (3 Replies)
Discussion started by: anne
3 Replies
LEARN ABOUT REDHAT
operator
OPERATOR(7) Linux Programmer's Manual OPERATOR(7)
NAME
operator - C operator precedence and order of evaluation
DESCRIPTION
This manual page lists C operators and their precedence in evaluation.
Operator Associativity
() [] -> . left to right
! ~ ++ -- + - (type) * & sizeof right to left
* / % left to right
+ - left to right
<< >> left to right
< <= > >= left to right
== != left to right
& left to right
^ left to right
| left to right
&& left to right
|| left to right
?: right to left
= += -= *= /= %= <<= >>= &= ^= |= right to left
, left to right
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2011-09-09 OPERATOR(7)