做过很多遍了，每次还是得现查，记一下:

echo "'param 1' 'param 2'" | xargs -n1 | xargs -I@ echo \[@\] \[@\]

output:

1
2

[param 1] [param 1]
[param 2] [param 2]

xargs里面替换字符串

ls|xargs -I @  echo "mv @ @.pack"|sed 's/.json.pack.pack/.pack/g'|bash