Usage: xargs [OPTION]... COMMAND INITIAL-ARGS...
Run COMMAND with arguments INITIAL-ARGS and more arguments read from input.

touch a.js b.js c.js

ls *.js | xargs ls -al

-rw-r--r-- 1 a wheel 0 12 18 16:18 a.js
-rw-r--r-- 1 a wheel 0 12 18 16:18 b.js
-rw-r--r-- 1 a wheel 0 12 18 16:18 c.js

ls *.js | xargs -t ls -al

ls -al a.js b.js c.js
-rw-r--r-- 1 a wheel 0 12 18 16:18 a.js
-rw-r--r-- 1 a wheel 0 12 18 16:18 b.js
-rw-r--r-- 1 a wheel 0 12 18 16:18 c.js

 -I R  same as --replace=R (R must be specified)
 -i,--replace=[R] Replace R in initial arguments with names
  read from standard input. If R is
  unspecified, assume {}

ls *.js | xargs -t -I '{}' mv {} {}.backup

mv a.js a.js.backup
mv b.js b.js.backup
mv c.js c.js.backup

touch a.js b.js c.js d.js

ls *.js | xargs -t -n2 ls -al

ls -al a.js b.js 
-rw-r--r-- 1 root root 0 Dec 18 16:52 a.js
-rw-r--r-- 1 root root 0 Dec 18 16:52 b.js
ls -al c.js d.js 
-rw-r--r-- 1 root root 0 Dec 18 16:52 c.js
-rw-r--r-- 1 root root 0 Dec 18 16:52 d.js

touch 'hello 01.css' 'hello 02.css'

# 命令
find . -name '*.css' | xargs -t ls -al
#输出
ls -al ./hello 01.css ./hello 02.css # 展开后的命令
ls: cannot access ./hello: No such file or directory
ls: cannot access 01.css: No such file or directory
ls: cannot access ./hello: No such file or directory
ls: cannot access 02.css: No such file or directory

find . -name '*.css' -print0 | xargs -0 -t ls -al

find . -mtime +7 | xargs -I '{}' mv {} /tmp/otc-svr-logs/