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@ -522,12 +522,6 @@ detail here:　http://stackoverflow.com/questions/33408762/bash-turning-single-c
awk '{split($2,a,",");for(i in a)print $1"\t"a[i]}' file
```
##### Sum up a file (each line in file contains only one number)
```bash
awk '{s+=$1} END {print s}' filename
```
##### Average a file (each line in file contains only one number)
```bash
awk '{s+=$1}END{print s/NR}'
@ -823,6 +817,13 @@ factor 50
seq 10|paste -sd+|bc
```
##### Sum up a file (each line in file contains only one number)
```bash
awk '{s+=$1} END {print s}' filename
```
##### Column subtraction
```bash