很久沒使用sed命令，今天有一個小需求需要對一批檔案的內容進行修改，於是想起sed命令，順便回顧一下。
文字的內容大致是
item [5]:
class = "IntervalTier"
name = "PhonAlign"
xmin = 0.0
xmax = 1.799688
intervals: size = 10
intervals [1]:
xmin = 0.0
xmax = 0.21
text = "#"
intervals [2]:
xmin = 0.21
xmax = 0.25
text = "ts"
intervals [3]:
xmin = 0.25
xmax = 0.28
text = "u"
intervals [4]:
xmin = 0.28
xmax = 0.51
text = "o"
intervals [5]:
xmin = 0.51
xmax = 0.71
text = "ts"
intervals [6]:
xmin = 0.71
xmax = 0.74
text = "u"
intervals [7]:
xmin = 0.74
xmax = 1.02
text = "o"
intervals [8]:
xmin = 1.02
xmax = 1.23
text = "ts"
intervals [9]:
xmin = 1.23
xmax = 1.76
text = "u"
intervals [10]:
xmin = 1.76
xmax = 1.799688
text = "o"
item [6]:
class = "IntervalTier"
name = "TokensAlign"
xmin = 0.0
xmax = 1.799688
intervals: size = 4
intervals [1]:
xmin = 0.0
xmax = 0.21
text = "#"
intervals [2]:
xmin = 0.21
xmax = 0.51
text = "做"
intervals [3]:
xmin = 0.51
xmax = 1.02
text = "做"
intervals [4]:
xmin = 1.02
xmax = 1.799688
text = "做"
item [7]:
class = "IntervalTier"
name = "Activity"
xmin = 0.0
xmax = 1.799688
intervals: size = 2
intervals [1]:
xmin = 0.0
xmax = 0.21
text = "silence"
intervals [2]:
xmin = 0.21
xmax = 1.799688
text = "speech"
複製程式碼主要替換的位置是'做'這個次替換成對應的拼音
稍微觀察一下檔案的特點，由於替換的位置位於item[6]~item[7]這兩個字串之間。於是使用
echo "sed -i -E '/item \[6\]/,/item \[7\]/s/text = \"([^#\"]+)\"/text = \"${prex}\"/g' ${line}"|sh
複製程式碼這裡有一個小的知識點，使用sed如果直接用變數格式化，但沒辦法進行格式化。於是藉助echo先將格式化好的字串輸出，然後呼叫sh命令執行。
另外還有一個用法，當需要在shell中判斷某個字串的包含關係，可以用如下的條件判斷
if [[ $line =~ "_" ]]
複製程式碼