How can I use ":" as an AWK field separator? How can I use ":" as an AWK field separator? bash bash

How can I use ":" as an AWK field separator?


bash awk

"-F" is a command line argument, not AWK syntax. Try:

 echo "1: " | awk -F  ":" '/1/ {print $1}'

bash awk

If you want to do it programatically, you can use the FS variable:

echo "1: " | awk 'BEGIN { FS=":" } /1/ { print $1 }'

Note that if you change it in the main loop rather than the BEGIN loop, it takes affect for the next line read in, since the current line has already been split.

bash awk

You have multiple ways to set : as the separator:

awk -F: '{print $1}'awk -v FS=: '{print $1}'awk '{print $1}' FS=:awk 'BEGIN{FS=":"} {print $1}'

All of them are equivalent and will return 1 given a sample input "1:2:3":

$ awk -F: '{print $1}' <<< "1:2:3"1$ awk -v FS=: '{print $1}' <<< "1:2:3"1$ awk '{print $1}' FS=: <<< "1:2:3"1$ awk 'BEGIN{FS=":"} {print $1}' <<< "1:2:3"1

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