(對一列數字求和)
在日常工作當中需要對文本過濾出來的數字進行求和運算，例如想統計一個MySQL分區表現在有多大
# ls -lsh AdPlateform#P#p*.ibd |grep G
2.6G -rw-rw---- 1 mysql mysql 2.6G Mar 4 01:05 AdPlateform#P#p20200304.ibd
2.9G -rw-rw---- 1 mysql mysql 2.9G Mar 5 01:12 AdPlateform#P#p20200305.ibd
# ls -lsh AdPlateform#P#p*.ibd |grep G|awk '{sum+=$6} END{print "sum="sum}'
sum=5.5
(對一行數字求和)
在日常工作當中需要對一行文本進行求和運算
# cat 1.txt
1 2 3 4 5 6 7 8 9 10
# cat 1.txt |awk '{for(i=1;i<=NF;i++) sum+=$i} END{print "sum="sum}'
sum=55
(行轉列)
# cat 1.txt
1 2 3 4 5 6 7 8 9 10
# awk '{for(i=1;i<=NF;i++)a[NR,i]=$i}END{for(j=1;j<=NF;j++)for(k=1;k<=NR;k++)printf k==NR?a[k,j] RS:a[k,j] FS}' 1.txt
1
2
3
4
5
6
7
8
9
10
(列轉行)
# cat 2.txt
1
2
3
4
5
6
7
8
9
10
# cat 2.txt |tr "\n" ","|sed -e 's/,$/\n/'|tr "," " "
1 2 3 4 5 6 7 8 9 10
(取出ip字段的前幾列)
# echo "10.10.33.161.62342" |awk -F'.' {'print $1,$2,$3,$4'}|tr " " "."
10.10.33.161