How to sleep for 1 second between each xargs team?

Question

For example, if I perform

ps aux | awk '{print $1}' | xargs -I {} echo {} 

I want the shell to sleep for 1 second between each echo .

How can I change the shell command?

Answer 1

You can use the following syntax:

 ps aux | awk '{print $1}' | xargs -I % sh -c '{ echo %; sleep 1; }' 

Be careful with spaces and semicolons. After each command, a semicolon is required between the brackets (even after the last).

Answer 2

Replace echo with some shell script named sleepecho containing

  #!/bin/sh sleep 1 echo $* 

Answer 3

If your awk supports it:

 ps aux | awk '{ system("sleep 1"); print $1 }' | xargs -I {} echo {}q 

or skip awk and xargs in general

 ps aux | while read -r user rest; echo $user sleep 1; done