Ubuntu - 查看資料行 10 by 10

Question

我需要寫一個腳本來檢視 /etc/passwd 10 x 10 的頁碼。因此按下按鈕後它將顯示接下來的 10 行。我應該使用什麼指令？嘗試檢查 awk、head、tail、命令，但沒有找到解決方案。

#!/bin/bash 

awk -F":" 'BEGIN { print "--------------------------------------------------"
                    printf "%-20s %-10s %-3s\n","USERNAME","GUID","DIRECTORY" 
                    print "--------------------------------------------------" 
                 } 
           NR==1, NR==10 {printf "%-20s %-10s %-3s\n", $1, $4, $7} ' /etc/passwd 

Answer 1

getline rc < "-"每第 10 行新增一次。若要抑制換行符，請使用下列指令將遊標向上移動一行system("tput cuu1")：

awk -F":" '
    BEGIN { print "--------------------------------------------------"
            printf "%-20s %-10s %-3s\n","USERNAME","GUID","DIRECTORY" 
            print "--------------------------------------------------" }
    !(NR%10) { getline rc < "-"; system("tput cuu1") }
    { printf "%-20s %-10s %-3s\n", $1, $4, $7 }
' /etc/passwd

若要新增頁碼，您可以使用：

awk -F":" -v TNR=$(wc -l < /etc/passwd) '
    BEGIN { NUM_PAGES=TNR/10+1
            print "--------------------------------------------------"
            printf "%-20s %-10s %-3s\n","USERNAME","GUID","DIRECTORY" 
            print "--------------------------------------------------" }

    !(NR%10) { PAGE++
               printf "--- Page %d of %d ---",PAGE,NUM_PAGES
               getline rc < "-"; system("tput cuu1") }

    { printf "%-20s %-10s %-3s\n", $1, $4, $7 }
' /etc/passwd