Use the shell to count the number of occurrences of a string and sort the display from large to small

Requirement Description: The string in the document is counted and sorted (from large to small), the test.txt content of the first 2 records is displayed as follows: A 12332a 2323a 234234b 232c 23432c 34 statistics and Sorting methods: [Email Protected] ~]$ awk ' {a[$1]++} END {for (I in a) {print i,a[i] | "Sort-r-K 2"} ' Test.txt > R.txt execution Result: A 3c 2b 1 the method of printing the first two records is as follows: [[email protected] ~]$ head-2 r.txt//Method 1 show first two lines a 3c 2[ [Email protected] ~]$ head-n 2 r.txt//Method 2 shows the first two lines a 3c 2 using the awk command: awk ' fnr<=2 ' r.txt//Method 3 shows the first two lines

Use the shell to count the number of occurrences of a string and sort the display from large to small