How to send control c from a bash script

Question

I m starting a number of screens in a bash script  then running django s runserver command in each of them  I d like to be able to programmatically stop them all as well  which requires me to send Control c to runserver   How can I send these keystrokes from my bash script

User · Answer

ctrl c and kill -INT  lt pid gt  are not exactly the same  to emulate ctrl c we need to first understand the difference  kill -INT  lt pid gt  will send the INT signal to a given process  found with its pid   ctrl c is mapped to the intr special character which when received by the terminal should send INT to the foreground process group of that terminal  You can emulate that by targetting the group of your given  lt pid gt   It can be done by prepending a - before the signal in the kill command  Hence the command you want is  kill -INT - lt pid gt   You can test it pretty easily with a script     usr bin env ruby  fork       trap  INT            puts  signal received in child           exit           sleep 1 000    puts  quot run  kill -INT -  Process pid   in any other terminal window  quot  Process wait  Sources   difference between both propagation explanation

User · Answer

Ctrl C sends a SIGINT signal   kill -INT  lt pid gt  sends a SIGINT signal too     Terminates the program  like Ctrl C  kill -INT 888   Force kill kill -9 888   Assuming 888 is your process ID     Note that kill 888 sends a SIGTERM signal  which is slightly different  but will also ask for the program to stop  So if you know what you are doing  no handler bound to SIGINT in the program   a simple kill is enough   To get the PID of the last command launched in your script  use         Launch script in background   my script sh  amp    Get its PID PID      Wait for 2 seconds sleep 2   Kill it kill  PID

User · Answer

CTRL-C generally sends a SIGINT signal to the process so you can simply do   kill -INT  lt processID gt    from the command line  or a script   to affect the specific processID   I say  generally  because  as with most of UNIX  this is near infinitely configurable  If you execute stty -a  you can see which key sequence is tied to the intr signal  This will probably be CTRL-C but that key sequence may be mapped to something else entirely     The following script shows this in action  albeit with TERM rather than INT since sleep doesn t react to INT in my environment       usr bin env bash  sleep 3600  amp  pid    sleep 5  echo     echo PID is  pid  before kill  ps -ef   grep -E  PPID  pid    sed  s         echo        kill -TERM  pid   2 gt  amp 1 sleep 5  echo     echo PID is  pid  after kill  ps -ef   grep -E  PPID  pid    sed  s         echo       It basically starts an hour-log sleep process and grabs its process ID  It then  outputs the relevant process details before killing the process   After a small wait  it then checks the process table to see if the process has gone  As you can see from the output of the script  it is indeed gone       PID is 28380  before kill     UID   PID     PPID    TTY     STIME      COMMAND    pax   28380   24652   tty42   09 26 49    bin sleep       qq sh  line 12  28380 Terminated              sleep 3600     PID is 28380  after kill     UID   PID     PPID    TTY     STIME      COMMAND

User · Answer

You can get the PID of a particular process like MySQL by using following commands  ps -e   pgrep mysql  This command will give you the PID of MySQL rocess  e g  13954 Now  type following command on terminal  kill -9 13954 This will kill the process of MySQL

User · Answer

pgrep -f process name  gt  any file name     sed -i  s   kill    any file name     chmod 777 any file name       any file name   for example  pgrep -f firefox  will grep the PID of running  firefox  and will save this PID to a file called  any file name    sed  command will add the  kill  in the beginning of the PID number in  any file name  file  Third line will make  any file name  file executable  Now forth line will kill the PID available in the file  any file name   Writing the above four lines in a file and executing that file can do the control-C  Working absolutely fine for me

[bash] How to send control+c from a bash script?

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