The role of CTRL + Z when running commands in Linux

 

Run the command CTRL + Z to force the current process to be switched to the background and stop it.

1. resume the process (background)

(1) Use the command bg

Example:

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $./tcpserv01

* CTRL + Z is used here, And serv01 is stopped *

[1] + Stopped./tcpserv01

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $ bg

[1] +./tcpserv01 & * at this time, serv01 runs in the background *

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $

(2) What if I use CTRL + Z to stop several programs?

Example:

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $ jobs

[1]-Running./tcpserv01 &

[2] + Stopped./tcpcli01 127.0.0.1

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $ bg % 1

Bash: bg: Task 1 has been transferred to the background * run in the background *

2. Restore the process to the foreground

Example:

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $./tcpserv04

[1] + Stopped./tcpserv04

Zuii @ zuii-desktop :~ /Unp/tcpcliserv $ fg

./Tcpserv04

Summary:

(1) CTRL + Z stop the process and put it in the background

(2) jobs displays the currently paused Processes

(3) bg % N run the nth task in the background (there is a space before %)

(4) fg % N run the nth task on the foreground

Bg by default. If fg does not contain % N, the last process is operated!