如何使用shell獲取一列數(shù)據(jù)的最后三個(gè)

jamesapple321

各位好：
       請(qǐng)教個(gè)問(wèn)題，現(xiàn)在有一列數(shù)據(jù)，如何使用shell獲取最后三行以外的字段
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jzsjm1002

1. awk '{a[NR]=$0}END{for(;++i<=length(a)-3;)print a[i]}' file

復(fù)制代碼

legs

#GNU head
head -n -3 file

#Perl
perl -e'@a=<>;print@a[0..@a-4]' file

moperyblue

1. sed '1{$d;N};$!N;$d;P;D'

復(fù)制代碼

fengzi321

回復(fù) 2# jzsjm1002

報(bào)錯(cuò)呢
feng@ubuntu:~$ awk '{a[NR]=$0}END{for (;++i <= length(a)-3{print a}}' A
awk: line 1: illegal reference to array a

fengzi321

回復(fù) 2# jzsjm1002

fengzi321

回復(fù) 2# jzsjm1002
報(bào)錯(cuò)
feng@ubuntu:~$ awk '{a[NR]=$0}END{for (;++i <= length(a)-3{print a}}' A
awk: line 1: illegal reference to array a

jzsjm1002

回復(fù) 7# fengzi321

print a 打錯(cuò)了a是數(shù)組

fengzi321

回復(fù) 8# jzsjm1002
是不是length（a）有問(wèn)題？
feng@ubuntu:~$ awk '{a[NR]=$0}END{for(;++i<=length(a)-3print a}' A
awk: line 1: illegal reference to array a

fengzi321

回復(fù) 9# fengzi321
這樣子就沒(méi)什么問(wèn)題
awk '{a[NR]=$0}END{for (i=1;i<= NR-3;i++){print a}}' A