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Shell Programming and Scripting

Absolute value function

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# 8  
Old 06-29-2012
Quote:
Originally Posted by Ygor
Try...
Code:
echo -10 | tr -d -

Yes, it works!

I should use "expr ..." when i need make some calculations with the variable that memorizes the command output, but i think is good for my purpose.
Thanks.
Last edited by Steph85; 06-29-2012 at 12:15 PM..
# 9  
Old 07-02-2012
Quote:
Originally Posted by Ygor
Try...
Code:
echo -10 | tr -d -

Yes, it works! Thanks!!Smilie
# 10  
Old 07-09-2012
Thanks to everybody!
# 11  
Old 07-09-2012
Code:
n=-10
echo "${n#-}"

# 12  
Old 07-09-2012
What is the meaning fo the command: "n#-"? Does it change the sign the number or it only removes the char "-"
# 13  
Old 07-09-2012
Quote:
Originally Posted by Steph85
What is the meaning fo the command: "n#-"? Does it change the sign the number or it only removes the char "-"
It removes only the characters -

Code:
 ${string#substring} Deletes shortest match of $substring from front of $string.

# 14  
Old 07-09-2012
In a script where i need to create mathematical expressions, i would prefer a command that works on numbers changing the sign, it is probably more correct, but this solution can works too i think.
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