printf '%g,%g,%g ',5/2,10/5,100 * 10000;
$names='jim ';
$days=20;
printf 'nhello,%s,time is over after %d days! n ',$names,$days;
printf ']n ',21;
printf '%-5dn ',21;
printf 'sn ',' jimGr ';
printf '%-10sn ',' jinGr ';
printf '.2fn ',123.365478;
printf '%-10.2fn ',123.365478; (长度为10,小数部分为2位)
2.5、2、1e 006
hello,jim,time is over after 20 days!
_ _ _21
21_ _ _
_ _ _ _ _jimGr
jinGr_ _ _ _ _
_ _ _ _123.37
123.37_ _ _ _