add_numbers_on_the_command_line []

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==== add numbers on the command line ====
Q. Add a bunch of numbers on the command line

A. You can do it in many ways.

Approach 1: Use python

  | python -c "import sys; print(sum(int(line) for line in sys.stdin))"

For example
<code>
 % seq 1 10 | python -c "import sys; print(sum(int(line) for line in sys.stdin))"
55
</code>

Approach 2: Use unix-only tools

  | paste -s -d + - | bc

For example
<code>
 % seq 1 10 | paste -s -d + - | bc               
55
</code>
Output of intermediate steps:
<code>
 % seq 1 10                     
1
2
3
4
5
6
7
8
9
10

 % seq 1 10 | paste -s -d +
1+2+3+4+5+6+7+8+9+10

 % seq 1 10 | paste -s -d + | bc
55
</code>
Ref:- 
  * https://stackoverflow.com/questions/450799/shell-command-to-sum-integers-one-per-line
  * https://stackoverflow.com/questions/3096259/bash-command-to-sum-a-column-of-numbers/22630224

tags | add a bunch of numbers on command line pipe