07-20-2011
What's your system? What's your shell? Knowing that will help find an answer that works for you, not just us.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hello,
I kinda newbie in unix so I would like so help.I know that there is a command that compares two integer numbers test (eg. #$1=0 ).I would like to know if it is possible to compare any number with another (eg. 2.3=0 or 3.7!=0 4.5>2.2).
Thank you in advance. (1 Reply)
Discussion started by: TabloMaxos
1 Replies
2. UNIX for Dummies Questions & Answers
Hi,
Can anyone explain what is going on here:
michael-browns-powerbook-g4-15:~ msb65$ start=-1
michael-browns-powerbook-g4-15:~ msb65$ stop=1
michael-browns-powerbook-g4-15:~ msb65$ if ; then echo hello; fi
-bash: ; then echo hello; fi
hello
Are you not allowed to compare negative... (6 Replies)
Discussion started by: msb65
6 Replies
3. UNIX for Dummies Questions & Answers
Hi,
I am writing a BASH shell script. I would like to construct an IF statement that allows me to determine if a variable is between -180 and 180. Example:
if ; then
echo 'WEST NOT WITHIN BOUNDS'
fi
However, I believe the negative sign is causing errors. What is the proper BASH... (6 Replies)
Discussion started by: msb65
6 Replies
4. UNIX for Dummies Questions & Answers
Hello,
I have a command that I need to supply a negative number as a parameter; how do I do this? I have tried giving it with double quotes, "", but no avail.
Thanks,
Gussi (3 Replies)
Discussion started by: Gussifinknottle
3 Replies
5. Shell Programming and Scripting
Hello,
For my weather station I have made a little perl script to put the data into cacti. The next problem I have.
I can only get positive numbers or negative numbers.
What do I do:
Though a shell scrip I call the perl script.
Shell script:
#!/bin/sh
cat data.txt | stats.pl
Perl... (4 Replies)
Discussion started by: rbl-blacklight
4 Replies
6. Shell Programming and Scripting
Let, I have three numbers
+00123.25
-00256.54
+00489.23
I need to sum up all those three numbers, after storing them in three variables (say var1, var2, var3).
I used both expr and BC, but they didn't work for me.
But, I am not able to sum up them, as I don't have any idea how to... (13 Replies)
Discussion started by: mady135
13 Replies
7. Shell Programming and Scripting
Dear All,
I have to split a tab delimited file in two files based on the presence of a positive or negative in column number 9 , for example
file:
A 1 5 erg + 6766 0.9889 0.9817 9.01882 erg inside upstream
B 1 8 erg2 + 6766 0.9889 0.9817 -9.22 erg2 inside... (3 Replies)
Discussion started by: paolo.kunder
3 Replies
8. UNIX for Dummies Questions & Answers
Greetings. I have a three column file, and there are some numbers in the second column that are <1. However I need all numbers to be positive, thus need to replace all those numbers with just one. I feel like there must be a simple way to use awk to find these numbers and sed to replace but can't... (5 Replies)
Discussion started by: Twinklefingers
5 Replies
9. UNIX for Dummies Questions & Answers
Dear Experts,
I have an IP file which looks like below ----
100 200 5.02
100 200 -2.99
100 200 -3.01
200 300 2.05
200 300 3.01
200 300 -5.06
I want an OP which looks like (decreasing numerically)--
100 200 5.02
100 200 -2.99
100 200 -3.01
200 300 3.01
200 300 2.05
200 300 -5.06 (2 Replies)
Discussion started by: Indra2011
2 Replies
10. UNIX for Beginners Questions & Answers
I have a file that is pipe delimited and in Column F they have number values, both positive and negative. I need to take the one file I am starting with and split it into two separate files based on negative and positive numbers. What is the command to do so? And then I need to also transfer... (4 Replies)
Discussion started by: cckaiser15
4 Replies
LEARN ABOUT FREEBSD
escape
escape(1) Mail Avenger 0.8.3 escape(1)
NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO
avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)