linux系统如何实现每两个空格插入制表符

1、测试数据

root@PC1:/home/test/test/test2# cat nuc.ped
G G C C G G G G A G A A
G G G C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G A G A A A A
G G C C G G A G A A A A

2、使用awk命令

root@PC1:/home/test/test/test2# awk '{for(i = 1; i <= NF; i++) if(i % 2 == 0) {printf("%s\t", $i)} else {printf("%s ", $i)} {printf("\n")}}' nuc.ped
G G     C C     G G     G G     A G     A A
G G     G C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     A G     A A     A A
G G     C C     G G     A G     A A     A A

2、使用sed实现

a、

root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt
root@DESKTOP-1N42TVH:/home/test# cat nuc.txt
G G C C G G G G A G A A
G G G C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G A G A A A A
G G C C G G A G A A A A
root@DESKTOP-1N42TVH:/home/test# cp nuc.txt nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# for i in `head -n 1 nuc.txt | awk '{print NF}' | xargs seq 2 2`; do sed -i "s/ /\t /$i" nuc.txt; done
root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt  nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# cat nuc.txt
G G      C C     G G     G G     A G     A A
G G      G C     G G     G G     G G     A A
G G      C C     G G     G G     G G     A A
G G      C C     G G     G G     G G     A A
G G      C C     G G     G G     G G     A A
G G      C C     G G     G G     G G     A A
G G      C C     G G     A G     A A     A A
G G      C C     G G     A G     A A     A A
root@DESKTOP-1N42TVH:/home/test# sed -i 's/\t /\t/g' nuc.txt
root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt  nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# cat nuc.txt
G G     C C     G G     G G     A G     A A
G G     G C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     A G     A A     A A
G G     C C     G G     A G     A A     A A

b、

root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt
root@DESKTOP-1N42TVH:/home/test# cat nuc.txt
G G C C G G G G A G A A
G G G C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G G G G G A A
G G C C G G A G A A A A
G G C C G G A G A A A A
root@DESKTOP-1N42TVH:/home/test# cp nuc.txt nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt  nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# for i in `head -n 1 nuc.txt | awk '{print NF/2}' | xargs seq 2`; do sed -i "s/ /\t/$i" nuc.txt; done
root@DESKTOP-1N42TVH:/home/test# ls
nuc.txt  nuc.txt_bak
root@DESKTOP-1N42TVH:/home/test# cat nuc.txt
G G     C C     G G     G G     A G     A A
G G     G C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     G G     G G     A A
G G     C C     G G     A G     A A     A A
G G     C C     G G     A G     A A     A A