Shell (13) parameter substitution

Shell parameter substitution xargs. Parameters that generate the command

1. Cut-d ': '-f 1/etc/passwd | Head-n 3 | Xargs finger

　　

2. Ask the user before executing

Cut-d ': '-f 1/etc/passwd | Head-n 3 | Xargs-p Finger

If you press ENTER directly, exit

　　

3. Specify the number of lookup parameters

Cut-d ': '-f 1/etc/passwd | Xargs-p-N 5 finger

　　

4. Specify that a string is encountered to end

Cut-d ': '-f 1/etc/passwd | Xargs-p-E ' deamon ' finger

　　

5. Scenarios that do not support pipelines

Xargs is particularly useful for commands that do not support pipelines

　　

The following command shows a result that is not desired

　　

Shell (13) parameter substitution