Oracle Linux xargs Command

Xargs reads items from the standard input, delimited by blanks (which can be protected with double or single quotes or a backslash) or newlines, and executes the command (default is /bin/echo) one or more times with any initial-arguments followed by items read from standard input.  Blank lines on the standard input are ignored.

-p Prompt the user about whether to run each command line and read a line from the terminal. 
-I replace-str Replace  occurrences  of replace-str in the initial-arguments with names read from standard input.  Also, unquoted blanks do not terminate input items; instead the separator is the newline character.

Examples:
List all *.dat files in the current directory and zip each file.
ls *.dat | xargs -I {} zip ./{}.zip {}

Generates a compact listing of all the users on the system.

cut -d: -f1 < /etc/passwd | sort | xargs echo

找出所有文件中行数最多的：

ls | xargs -I {} wc -l {} | sort -n | tail -1