grep -o -a -m 1 -h -r "Pulsanti Operietur" /path/to/dir | head -1
每个grep选项的解释:
-o, --only-matching, print only the matched part of the line (instead of the entire line)
-a, --text, process a binary file as if it were text
-m 1, --max-count, stop reading a file after 1 matching line
-h, --no-filename, suppress the prefixing of file names on output
-r, --recursive, read all files under a directory recursively