1、測試數據，依據列數篩選數據
root@PC1:/home/test# ls test.txt root@PC1:/home/test# cat test.txt ## 測試數據 2 3 4 3 d a 3 d d w e f z v e z c g k e q z v b d root@PC1:/home/test# awk 'NF == 3' test.txt ## 篩選test.txt中列數為3的數據 a 3 d z v e root@PC1:/home/test# awk 'NF == 4' test.txt ## 篩選test.txt中列數為4的數據 d w e f z v b d root@PC1:/home/test# awk 'NF == 5' test.txt 2 3 4 3 d root@PC1:/home/test# awk 'NF == 6' test.txt z c g k e q
2、
root@PC1:/home/test# cat test.txt 2 3 4 3 d a 3 d d w e f z v e z c g k e q z v b d root@PC1:/home/test# awk '{if(gsub(/ /, "&") == 3 - 1) print $0}' test.txt ## 提取列數為3的行 a 3 d z v e root@PC1:/home/test# awk '{if(gsub(/ /, "&") == 4 - 1) print $0}' test.txt d w e f z v b d root@PC1:/home/test# awk '{if(gsub(/ /, "&") == 5 - 1) print $0}' test.txt 2 3 4 3 d