如何通過UNIX來連接線命令

我有一個文件myfile.txt中如何通過UNIX來連接線命令

"field1","val1","val2","val3" 
"field2","val1","val2","val3" 
"field3","val1","va 
    l2","va 
    l3" 
"field4","val1","val2","val3"

我想做這個文件中這樣的普通視圖：

"field1","val1","val2","val3" 
"field2","val1","val2","val3" 
"field3","val1","val2","val3" 
"field4","val1","val2","val3"

所以，我試圖做用下一個命令：

filename=myfile.txt 

while read line 
do 
    found=$(grep '^[^"]') 
    if [ "$found" ]; then   
     #think here must be command "paste"  
    fi 
done < $filename

但是有什麼不對。請幫我，我不是大師在UNIX命令

來源

2017-08-09 Andrey Khmelev

請勿在'grep'的正則表達式周圍放置'//'分隔符。 – Barmar

'awk'會是更好的方法。如果該行不以''結尾，請閱讀下一行並連接它。 – Barmar

@Barmar編輯了unix命令，但現在我發現只有1行 –

試試這個：

filename=$1 

while read -r line 
do 
    found=$found$(echo $line | grep '[^"]') 
    if [[ -n $found && $found == *\" ]]; then 
     echo $found; 
     found='' 
    fi 
done < "$filename"

變量$found總是附加到自己這樣你會加入「虛線」。
在如果它然後檢查是否$found不爲空（-n就是這樣做的），然後檢查是否$found通過@Barmar

的建議如果它以一個報價是這樣的結束而終止以引號結束所以你echo $found變量設置空

來源

2017-08-09 15:08:37

謝謝，但現在是問題如何連接？ –

引用你的變量 – Barmar

@AndreyKhmelev以'found ='開頭的行連接 – Barmar

的sed解決方案：

sed -Ez 's/[[:space:]]+//g; s/""/","/g; s/(([^,]+,){3})([^,]+),/\1\3\n/g; $a\\' myfile.txt

-z - 處理輸入作爲通過空分離線（零）字符而不是換行符
s/[[:space:]]+//g - 刪除之間的空格/線內
s/""/","/g - 分離相鄰的字段，其被包裹/ breaked
s/(([^,]+,){3})([^,]+),/\1\3\n/g - 每個第四字段換行符（記錄分隔符）設置
$a\\ - 追加最終換行符在內容結束

輸出：

"field1","val1","val2","val3" 
"field2","val1","val2","val3" 
"field3","val1","val2","val3" 
"field4","val1","val2","val3"

來源

2017-08-09 15:13:07 RomanPerekhrest

您可以在您的解決方案的工作方式上添加評論 –

@anvitasurapaneni，查看我的解釋 – RomanPerekhrest

非常清楚..謝謝:) –

不知道在輸入字段數，你可以使用這個GNU的awk的解決方案使用FPAT和gensub：

awk -v RS= -v FPAT='("[^"]*"|[^,"]+),?' -v OFS= '{ 
     for (h=1; h<=NF; h++) $h = gensub(/([^"])\n[[:blank:]]*/, "\\1", "g", $h); } 1' file 

"field1","val1","val2","val3" 
"field2","val1","val2","val3" 
"field3","val1","val2","val3" 
"field4","val1","val2","val3"

要將更改保存迴文件，請使用：

awk -i inplace -v RS= -v FPAT='("[^"]*"|[^,"]+),?' -v OFS= '{ 
     for (h=1; h<=NF; h++) $h = gensub(/([^"])\n[[:blank:]]*/, "\\1", "g", $h); } 1' file

來源

2017-08-09 16:31:04 anubhava

如何通過UNIX來連接線命令

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