bash文件读取，while循环
如果这个问题已经得到解答，我很抱歉，但由于我不确定问题到底是什么（在几种可能性中），所以我的搜索没有成功。
我想要做的是获取每个在文本文件中写为一行的标签号，对包含该标签的文件执行操作，并将结果输出到文件中。我所拥有的是这样的：
cat good_PFC.txt | while read line;
do
base_file=${line}_blah.nii.gz
new_fa=${line}_fa_uncmasked.nii.gz
new_tr=${line}_tr_uncmasked.nii.gz
if [ -e $base_file ]; then
echo -n "$line " >> FA_unc_stats.txt
fslstats $new_fa -M | tr '\n' ' ' >> FA_unc_stats.txt
fslstats $new_fa -S | tr '\n' ' ' >> FA_unc_stats.txt
else
echo $line "not a file"
fi;
done
其中 fslstats 是一个输出数字的命令，good_PFC.txt 是一个测试文件，其中包含
123
125
132
FA_unc_stats.txt 中的输出是
123 0.221061 0.097268
问题是，终端正确输出“125 not a file”，但不执行任何操作132，我知道它恰好指向一个真实的文件。所以我相信我的 while 循环中的语法有问题，但我不知道是什么！我敢打赌这很愚蠢，但我就是想不通。谢谢！
预计到达时间： 通过在 good_PFC.txt 末尾添加换行符来修复现在的问题是，每当我到达新标签时，我都需要将换行符写入输出文件，但它不会这样做。我尝试
echo /n >> FA_unc_stats.txt
先添加，但它在自己的行上打印“/n”...我在换行命令上失败了！
I'm sorry if this has been answered but since I'm not positive what exactly is the problem (among several possibilities) I haven't been successful in my searches.
What I want to do is take label numbers that are each written as a line in a text file, do things with files containting that label, and output the results to a file. What I have is this:
cat good_PFC.txt | while read line;
do
base_file=${line}_blah.nii.gz
new_fa=${line}_fa_uncmasked.nii.gz
new_tr=${line}_tr_uncmasked.nii.gz
if [ -e $base_file ]; then
echo -n "$line " >> FA_unc_stats.txt
fslstats $new_fa -M | tr '\n' ' ' >> FA_unc_stats.txt
fslstats $new_fa -S | tr '\n' ' ' >> FA_unc_stats.txt
else
echo $line "not a file"
fi;
done
In which fslstats is a command that outputs numbers and good_PFC.txt is a test file containing
123
125
132
The output in FA_unc_stats.txt is
123 0.221061 0.097268
What's wrong is, the terminal correctly outputs "125 not a file", but does nothing with 132, which I know happens to point to a real file. So I believe something is wrong with the syntax in my while loop, but I don't know what! I bet it's something stupid but I just can't figure it out. Thanks!
ETA:
Fixed by adding a newline to the end of good_PFC.txt Now the problem is I need a newline written to the output file whenever I get to a new label, but it doesn't do that. I tried adding
echo /n >> FA_unc_stats.txt
first, but it prints "/n" on it's own line... I fail at newline commands!
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您知道循环是否在最后一行运行吗？由于缺少换行符，Bash 可能会跳过最后一行。尝试在文件的最后一行添加换行符，看看是否可以解决问题。
Do you know if the loop is being run on the last line at all? Bash may be skipping the last line due to a lack of a newline terminator. Try adding a newline to the last line in the file and see if that fixes the problem.
只需添加“echo $line”，您就会看到读取循环是否按您的预期工作。
Just add 'echo $line' and you will see if the read loop is working as you expect.
拆下第一根管子
Remove the first pipe with
尝试将 fslstsats 命令放在反引号中：
`
try putting the fslstsats commands in back ticks:
`