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  1. #!/bin/bash
  2.  
  3. awk 'NR>2{a[$1]++}END{for(i in a)printf i"_"a[i]}'
Success #stdin #stdout 0s 5884KB
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stdin
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5  
A mystery chemical formula...  
Ba      0.000   0.000  0.000  
Hf      0.5     0.5    0.5  
O       0.5     0.5    0.000  
O       0.5     0.000  0.5  
O       0.000   0.5    0.5
stdout
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O_3Hf_1Ba_1
https://ideone.com/7RPZ0s
language:
Bash (bash 5.0.3)
created:
8 years ago
visibility:
public

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