Awk from getting started to getting into the ground (3) the built-in functions printf and print of awk realize formatted printing

awk in print And printf The main differences are shown in the following two points ：

• print When displaying multiple results, separate them with commas , As a result, the contents of these parts will automatically use the output separator （ The default field output delimiter is a space , The record output delimiter defaults to line feed ） separation , And there is no need to add line breaks \n; If not used , interval , Will be connected when printing , Even if spaces are used ：

[email protected]:~$ awk  -F: 'BEGIN{k=1} {print $1,$2}' /etc/passwd
root x
daemon x
bin x
sys x

[email protected]:~$ awk  -F: 'BEGIN{k=1} {print $1 $2}' /etc/passwd
rootx
daemonx
binx
sysx
syncx
gamesx

• printf You can control the output format of a field more flexibly , By using %-12s,%3.1f Equal formatting method .printf Closer to using C The habits of language students .

$ awk  -F: 'BEGIN{k=1} {printf "%s,%s