How to Print the First Column or Last Column or Both Using `Awk'?
The command for printing the first column or last column of a file can be executed using awk. This is because awk takes input from stdin, which is read by awk. The following program shows how to print the first column and last column of a file.
awk print first characters of a field
By 
bougui
on Jan 15, 2021
bougui
on Jan 15, 2021
awk '{print substr($1,1,1)}'0
This differs from the print command because only the first or last rows of input are printed out.
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