bash 如何让猫开始新的一行
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How to make cat start a new line
提问by user3890260
I have four files:
我有四个文件：
one_file.txt
one_file.txt
abc | def
two_file.txt
two_file.txt
ghi | jkl
three_file.txt
三文件.txt
mno | pqr
four_WORD.txt
四字.txt
xyz| xyz
I want to concatenate all of the files ending with "file.txt" (i.e. all except four_WORD.txt) in order to get:
我想连接所有以“file.txt”结尾的文件（即除four_WORD.txt之外的所有文件）以获得：
abc | def
ghi | jkl
mno | pqr
To accomplish this, I run:
为了实现这一点，我运行：
cat *file.txt > full_set.txt
cat *file.txt > full_set.txt
However, full_set.txt comes out as:
但是， full_set.txt 出来为：
abc | defmno | pqrghi | jkl
Any ideas how to do this correctly and efficiently so that each ends up on its own line? In reality, I need to do the above for a lot of very large files. Thank you in advance for your help.
任何想法如何正确有效地做到这一点，以便每个人都以自己的方式结束？实际上，我需要对很多非常大的文件执行上述操作。预先感谢您的帮助。
回答by Sylvain Leroux
Try:
尝试：
awk 1 *file.txt > full_set.txt
This is less efficient than a barecatbut will add an extra \nif missing at the end of each file
这比空的效率低，cat但\n如果在每个文件的末尾丢失，则会增加一个额外的
回答by tripleee
Many tools will add newlines if they are missing. Try e.g.
如果缺少换行符，许多工具会添加换行符。尝试例如
sed '' *file.txt >full_set.txt
but this depends on your sedversion. Others to try include Awk, grep -ho '.*' file*.txtand etc.
但这取决于您的sed版本。其他尝试包括 awkgrep -ho '.*' file*.txt等。
回答by John B
You can loop over each file and do a check to see if the last line ends in a new line, outputting one if it doesn't.
您可以遍历每个文件并检查最后一行是否以新行结尾，如果不是则输出一个。
for file in *file.txt; do
cat "$file"
[[ $(tail -c 1 "$file") == "" ]] || echo
done > full_set.txt
回答by Simply_me
回答by linibou
this works for me:
这对我有用：
for file in $(ls *file.txt) ; do cat $file ; echo ; done > full_set.txt
I hope this will help you.
我希望这能帮到您。
回答by shlomi33
find . -name "*file.txt" | xargs cat > full_set.txt
