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              調用命令歷史列表的命令【每日一個知識點第351期-Linux】

              echo命令??打印或輸出內容查詢變量值,常用于編程【每日一個知識點第351期-Linux】

              echo命令??打印或輸出內容,查詢變量值,常用于編程

              [root@dxl ~ 12:46:19]# echo $HISTSIZE

              1000

              [root@dxl ~ 18:13:37]# echo $HISTFILESIZE

              1000

              語   法:echo [-ne][字符串]或 echo [–help][–version]
              補充說明:echo會將輸入的字符串送往標準輸出。輸出的字符串間以空白字符隔開, 并在最后加上換行號。
              參 ? 數:-n 不要在最后自動換行
              -e 若字符串中出現以下字符,則特別加以處理,而不會將它當成一般
              文字輸出:
              \a 發出警告聲;
              \b 刪除前一個字符;
              \c 最后不加上換行符號;
              \f 換行但光標仍舊停留在原來的位置;
              \n 換行且光標移至行首;
              \r 光標移至行首,但不換行;
              \t 插入tab;
              \v 與\f相同;
              \\ 插入\字符;
              \nnn 插入nnn(八進制)所代表的ASCII字符;
              –help 顯示幫助
              –version 顯示版本信息

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