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7
votes
5answers
5k views

How to create a sequence with leading zeroes using brace expansion

When I use the following, I get a result as expected: $ echo {8..10} 8 9 10 How can I use this brace expansion in an easy way, to get the following output? $ echo {8..10} 08 09 10 I now that ...
6
votes
1answer
653 views

Why does a=0; let a++ return exit code 1?

Try it: $ a=0 $ let a++ $ echo $? 1 # Did the world just go mad? $ echo $a 1 # Yes, it did. $ let a++ $ echo $? 0 # We have normality. $ echo $a 2 Contrast with this: $ b=0 $ let b+=1 $ echo $? 0 ...
24
votes
9answers
33k views

Is there a way to get the min, max, median, and average of a list of numbers in a single command?

I have a list of numbers in a file, one per line. How can I get the minimum, maximum, median and average values? I want to use the results in a bash script. Although my immediate situation is for ...
12
votes
6answers
11k views

How to compare to floating point number in a shell script

I want to compare two floating point numbers in a shell script. The following code is not working: #!/bin/bash min=12.45 val=10.35 if (( $val < $min )) ; then min=$val fi echo $min
16
votes
5answers
1k views

Parenthesis in bash arithmetic: 3 * (2 + 1)

expr does not seem to like parenthesis (used in mathematics to explicit operator priority): expr 3 * (2 + 1) bash: syntax error near unexpected token `(' How to express operator priority in bash?
2
votes
2answers
428 views

Comparison of decimal numbers in bash

My search this morning was about how could I compare two decimal numbers in bash, and I came to this answser: How to compare to floating point number in a shell script. This one, however, doesn't ...
6
votes
1answer
261 views

What is the rationale for the bash shell not warning you of arithmetic overflow etc.?

There are limits set for the arithmetic evaluation capabilities of the bash shell. The manual is succinct about this aspect of shell arithmetic but states: Evaluation is done in fixed-width ...