【发布时间】：2016-05-17 22:33:06
【问题描述】：
如果文件有 windows 行结尾，我正在寻找编写 if 语句，将其更改为 linux 行结尾，否则什么也不做
这是带有 Windows 行结尾 ^M 或 \r\n 的文件
$ cat -v file.csv | head
"Rec_Open_Date","MSISDN","IMEI","Data_Volume_Bytes","Device_Manufacturer","Device_Model","Product_Description"^M
"2015-10-06","427","060","137765","Samsung Korea","Samsung SM-G900I","$39 Plan"^M
"2015-10-06","592","620","0","Apple Inc","Apple iPhone 6 (A1586)","PREPAY STD - TRIAL - #16"^M
"2015-10-06","007","290","0","Apple Inc","Apple iPhone 6 (A1586)","PREPAY PLUS - $0 -"^M
"2015-10-06","592","050","48836832","Apple Inc","Apple iPhone 5S (A1530)","Talk and Text Connect Flexi Plan"^M
"2015-10-06","409","720","113755347","Samsung Korea","Samsung SM-G360G","$29 CARRYOVER PLAN"^M
"2015-10-06","742","620","19840943","Apple Inc","Apple iPhone S (A1530)","PREPAY STD - $0 - #2"^M
"2015-10-06","387","180","0","HUAWEI Technologies Co Ltd","HUAWEI HUAWEI G526-L11","PREPAY STD - $1 - #4"^M
"2015-10-06","731","570","2258243","Samsung Korea","Samsung SM-N910U","Business Freedom"^M
"2015-10-06","556","910","13332272","Samsung Korea","Samsung GT-I9505","$49 Plan"^M
这是将其转换为 linux 行尾 \n 的代码：
$ awk 'sub("\r$", "")' file.csv | head | cat -v
"Rec_Open_Date","MSISDN","IMEI","Data_Volume_Bytes","Device_Manufacturer","Device_Model","Product_Description"
"2015-10-06","427","060","137765","Samsung Korea","Samsung SM-G900I","$39 Plan"
"2015-10-06","592","620","0","Apple Inc","Apple iPhone 6 (A1586)","PREPAY STD - TRIAL - #16"
"2015-10-06","007","290","0","Apple Inc","Apple iPhone 6 (A1586)","PREPAY PLUS - $0 -"
"2015-10-06","592","050","48836832","Apple Inc","Apple iPhone 5S (A1530)","Talk and Text Connect Flexi Plan"
"2015-10-06","409","720","113755347","Samsung Korea","Samsung SM-G360G","$29 CARRYOVER PLAN"
"2015-10-06","742","620","19840943","Apple Inc","Apple iPhone S (A1530)","PREPAY STD - $0 - #2"
"2015-10-06","387","180","0","HUAWEI Technologies Co Ltd","HUAWEI HUAWEI G526-L11","PREPAY STD - $1 - #4"
"2015-10-06","731","570","2258243","Samsung Korea","Samsung SM-N910U","Business Freedom"
"2015-10-06","556","910","13332272","Samsung Korea","Samsung GT-I9505","$49 Plan"
这是我的基本 if 语句，我只是不确定如何从行尾获得真假：谁能告诉我该怎么做？
if [ $1 -gt 100 ] ## line ending =^M
then
awk 'sub("\r$", "")' file.csv ## remove the windows line endings
fi
据我所知，为自己做笔记
Windows 行尾可以是^M、\r\n 或CRLF。
linux的行尾可以是\nLF。
EDIT1
认为this 是我正在寻找的。p>
$ eol=$(cat -v file.csv | head -n1 | grep -o '..$')
$ echo "$eol"
^M
$ if [ "$eol" = "^M" ]; then echo "true"; fi
true
$ if [ "$eol" = "^M" ]; then echo "true"; else echo "false"; fi
true
我会把awk 'sub("\r$", "")' file.csv 作为我的真实陈述
【问题讨论】：
-
有什么用？如果文件已经有 *nix 行结尾，那么
awk命令是无操作的。 -
如果只需要转换行尾，那么请看
man dos2unix -
而^M、CR（来自CRLF）和“\r”描述的是同一个字符。
-
file实用程序的某些配置将报告类似于“MS-Windows 文本文件”的内容。使用file file.csv检查您的版本。祝你好运。
标签： linux file line line-endings