使用awk從文本文件中提取特定字符的數量

Question

我有一個看起來像這樣的文本文件。我想提取「A」和「E」字符的總數。

>pr1 
FSVSQNNPAE 
>pr2 
MAKERAHSQ 
>pr3 
RRRDKINNWIVQL 

我想獲得這樣的

>pr1 
Total number of A - 1 
Total number of E - 1 

>pr2 
Total number of A – 2 
Total number of E - 1 

>pr3 
Total number of A – 0 
Total number of E – 0 

我怎樣才能做到這一點使用awk輸出？

Answer 1

單程。當找到以>開頭的行時，請閱讀下一行，將其保存在str變量中，並計算每個字母的替換次數。

awk ' 
    $1 ~ /^>/ { 
     getline str 
     num_a = gsub(/A/, "", str) 
     num_e = gsub(/E/, "", str) 
     printf "%s\nTotal number of A - %d\nTotal number of E - %d\n\n", $0, num_a, num_e 
    } 
' infile 

輸出：

>pr1                                                           
Total number of A - 1                                                       
Total number of E - 1                                                       

>pr2                                                           
Total number of A - 2                                                       
Total number of E - 1                                                       

>pr3                                                           
Total number of A - 0                                                       
Total number of E - 0 

Answer 2

UPDATE：這將在飛行中改變FS（field seperator）工作：

{ 
    if ($0 ~ /^>/) 
    printf("\n%s\n", $0); 
    else 
    { 
    FS="A" 
    nl = $0; 
    $0 = nl; 
    print "Total number of A - ", NF-1; 

    FS="E" 
    $0 = nl; 
    print "Total number of E - ", NF-1; 
    } 
} 

給出：

>pr1 
Total number of A - 1 
Total number of E - 1 

>pr2 
Total number of A - 2 
Total number of E - 1 

>pr3 
Total number of A - 0 
Total number of E - 0 

---

以前的解決方案：

{ 
    if ($1 ~ /^>/) 
    printf("\n%s\n", $0) 
    else 
    { 
    print "total number of A - ", gsub(/A/,"A") 
    print "total number of E - ", gsub(/E/,"E") 
    } 
} 

類似@ Birei的