sed和awk

baby_神

sed 版打印匹配行的前几行
seq 10 | sed -rn '/8/{x;G;p};H;g;s@(.*\n)*((.*\n){1}.*$)@\2@;h'

seq 10 | sed -n '/\n/{x;bb};1h;1!H;4,${x;D};:b;/8/{g;p}'

seq 10 | sed -n '1h;1!H;4,${x;s/[^\n]\+\n//;x};/8/{g;p}'

baby_神

1、逆时针矩阵

1. awk -vN=1000 'BEGIN{n = (int(sqrt(N) / 2) - sqrt(N) / 2) ? (int(sqrt(N) / 2) + 1) : (int(sqrt(N) / 2));for(i = 1;i <= 2 * n;i++){for(j = 1;j <= 2 * n;j++){if(j + i - 1 < 2 * n){r = (j >= i) ? (n - i + 1) : (n - j + 1);v = (j >= i) ? (4 * (n - i)^2 - j - i + 2 * n + 1) : (4 * (n - j)^2 - 3 * j + i + 2 * n + 1);} else {r = (j <= i) ? (i - n) : (j - n);v = (j <= i) ? (4 * (i - n - 1)^2 + j + 5 * i - 6 * n - 3) : (4 * (j - n - 1)^2 + 7 * j - i - 6 * n - 3)}srand(r);printf("\033["(30 + int(1 + 9 * rand()))"m%4s\033[m", (v > N) ? "" : v);}print ""}}'

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2、

1. echo 15|awk '{x=8;for(i=1;i<$0;i++){for(j=1;j<=3*($0-i)-(x>0?x:0);j++)printf" ";for(k=i;k>=1;k--)printf"%d ",k;for(l=2;l<=i;l++)printf"%d ",l;printf"\n";x--};for(i=1;i<=$0;i++){for(j=1;j<=(i<=$0-10+1?3*(i-1):3*(i-1)+2-(i-$0%10-10*int(($0-10)/10)));j++)printf" ";for(k=$0-i+1;k>=1;k--)printf"%d ",k;for(l=2;l<=$0-i+1;l++)printf"%d ",l;printf"\n"}}

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sditmaner

sed打印匹配行的前几行怎么写

baby_神

sed 打印文件内容并清空文件

1. [root@test-01 ~]# seq 5 > b              
   
2. [root@test-01 ~]# sed '${p;s/.*/:>b/e;d}' b
   
3. 1
   
4. 2
   
5. 3
   
6. 4
   
7. 5
   
8. [root@test-01 ~]# cat b
   
9. [root@test-01 ~]#
   
10. [root@test-01 ~]#

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baby_神

1. seq 9 | sed -nr 'N;s/\n(.*)/ \1\n\1/;P;D'
   
2. seq 9 | awk 'NR>1{print a,$0}{a=$0}'
   
3. 1 2
   
4. 2 3
   
5. 3 4
   
6. 4 5
   
7. 5 6
   
8. 6 7
   
9. 7 8
   
10. 8 9

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