bash 从文件中读取行，然后使用这些值搜索不同的文件
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Read lines from a file then search a different file using those values
提问by Fr0ntSight
I have a file with a list of names in it (names.txt) and I have a file with thousands of lines of tab seperated values (CallLog.tsv). I need to grepeach name in names.txtusing the CallLog.tsvfile and then save that as a new file.
我有一个包含名称列表的文件 ( names.txt)，我有一个包含数千行制表符分隔值 ( CallLog.tsv) 的文件。我需要使用该文件的grep每个名称，然后将其另存为一个新文件。names.txtCallLog.tsv
Right now I am doing the names individually:
现在我正在单独命名：
grep "John" CallLog.tsv > JohnCallLogs
Then I am taking all the names and cat'ing them to another file:
然后我把所有的名字cat都放到另一个文件中：
cat "John" "Mike" "Dave > FilteredCallLogs
I want to write a script to make this more efficient. I appreciate any help.
我想写一个脚本来提高效率。我很感激任何帮助。
回答by chepner
Instead of calling grepmultiple times (once per name), use the -foption to find all matches in one call:
grep使用该-f选项在一次调用中查找所有匹配项，而不是多次调用（每个名称一次）：
grep -f names.txt CallLog.tsv > FilteredCallLogs.tsv
If you need the lines grouped by name, you can sort the result on the proper field:
如果您需要按名称分组的行，您可以在适当的字段上对结果进行排序：
# E.g., if the names are in column 2
grep -f names.txt CallLog.tsv | sort -k2,2 > FilteredCallLogs.tsv
回答by Ansgar Wiechers
Try something like this:
尝试这样的事情：
#!/bin/bash
while read name; do
grep "$name" CallLog.tsv
done <names.txt >FilteredCallLogs.tsv
<names.txtfeeds names.txtinto the loop where while read namereads it line-by-line into the loop variable $name. >FilteredCallLogs.tsvredirects the output from the loop into the file FilteredCallLogs.tsv.
<names.txt进料names.txt入回路，其中while read name读取它行由行成循环变量$name。>FilteredCallLogs.tsv将循环的输出重定向到文件中FilteredCallLogs.tsv。
