awk命令行参数

<code lang="powershell">
$ cat datafile
northwest  NW  Joel Craig     3.0   .98   3    4
western    WE  Sharon Kelly   5.3   .97   5    23
southwest  SW  Chris Foster   2.7   .8    2    18
southern   SO  May Chin       5.1   .95   4    15
southeast  SE  Derek Johnson  4.0   .7    4    17
eastern    EA  Suan Beal      4.4   .84   5    20
northeast  NE  TJ Nichols     5.1   .94   3    13
north      NO  Val Shultz     4.5   .89   5    9
central    CT  Sheri Watson   5.7   .94   5    13

$ cat argvs.sc
# Testing command-line arguments with ARGV and ARGC using a for 1oop.
BEGIN{
    for(i=0; i<ARGC; i++){
        printf("argv[%d] is %s\n",i , ARGV[i]}
        printf ("The number of arguments, ARGC=%d\n",ARGC)
    }
}

$ awk -f argvs.sc datafile
argv[O] is nawk
argv[l] is datafile
The number of arguments, ARGC=2

$ awk ‘BEGIN{name=ARGV[1]};\
$0 ~ name {print $3, $4}‘ "Derek" datafile
awk: can t open Derek
source line number 1

$ awk ‘BEGIN {name=ARGV[1]; delete ARGV[1] };\
$0 ~ name {print $3, $4}‘ "Derek" datafile
Derek Johnson