Sed的使用方法
1>.Sed 讀取數據
sed
A).使用sed
從一行開始查找一直到出現有某個詞語的行結束
The honesuckle band played all night long for only $90.
It was an evening of splendid music and company.
Too bad the disco floor fell through at 23:10.
The local nurse Miss P.Neave was in attendanc.
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//從第二行 到出現The的行
sed -n '2,/The/'p test.txt
B). 匹對字符
查找一個含有 $的字符的行
sed -n '/\$/'p test.txt
The honesuckle band played all night long for only $90.
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sed -n '/The/'p test.txt
The honesuckle band played all night long for only $90.
The local nurse Miss P.Neave was in attendanc.
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C).整篇顯示
sed -n '1,$p' test.txt
D).任何單詞的行
sed -n '/.*ing/'p test.txt
E).顯示行號
sed -n -e '/music/=' test.txt
如果既顯示行號又顯示該行的內容可以使用
sed -n -e '/music/p' -e '/music/=' test.txt
F). 第一行與最後一行的顯示
# the first line
sed -n '1p' test.txt
# and the last line
sed -n '$p' test.txt
2>.sed 的 添加字符和文件
3>.sed的替換與刪除
The honesuckle band played all night long for only $90.
It was an evening of splendid music and company.
Too bad the disco floor fell through at 23:10.
The local nurse Miss P.Neave was in attendanc.
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A).首字符的刪除
#刪除每行開始的T字母
sed 's/^T*//g' test.txt
#把經過輸出到一個新的文件test1.txt中
sed 's/^T*//gw test1.txt' test.txt
w --文件名 將結果輸出定向到一個文件
p --缺省情況下將被替換行寫入標准輸出,
n --不打印輸出結果.
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