Create Exercise.011.solutions

Author: elenammul

MMUL-BASH-01/Exercises/Day-4/Exercise.011.solutions

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+Exercise 011 - solutions
+
+1) sleep 100
+
+   and then CTLZ+Z
+   
+   [mmul@mmul-bash-course ~] $ sleep 100
+   ^Z
+   [1]+  Stopped                 sleep 100
+   
+2) Use ps -l
+
+   [mmul@mmul-bash-course ~]$ ps -l
+   F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
+   0 S 31700 59195 59194  0  80   0 - 29387 do_wai pts/0    00:00:00 bash
+   0 T 31700 59224 59195  0  80   0 - 26989 do_sig pts/0    00:00:00 sleep
+   0 R 31700 59231 59195  0  80   0 - 38312 -      pts/0    00:00:00 ps
+
+3) [mmul@mmul-bash-course ~]$  kill 59224
+   [mmul@mmul-bash-course ~]$ ps -l
+   F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
+   0 S 31700 59195 59194  0  80   0 - 29387 do_wai pts/0    00:00:00 bash
+   0 T 31700 59224 59195  0  80   0 - 26989 do_sig pts/0    00:00:00 sleep
+   0 R 31700 59482 59195  0  80   0 - 38312 -      pts/0    00:00:00 ps
+   
+   kill didn't kill the process.
+   This is because the kill command, by default, will send a SIGTERM signal.
+   Some processes catch the TERM signal and ignore the command.
+   
+4) Using the signal name:
+
+   [mmul@mmul-bash-course ~]$ kill -s SIGKILL 59224
+   [mmul@mmul-bash-course ~]$ ps -l
+   F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
+   0 S 31700 59195 59194  0  80   0 - 29387 do_wai pts/0    00:00:00 bash
+   0 R 31700 59652 59195  0  80   0 - 38312 -      pts/0    00:00:00 ps
+   [1]+  Killed                  sleep 100
+   
+   Using the signal code (the most common):
+   
+   [mmul@mmul-bash-course ~]$ kill -9 59723
+   [mmul@mmul-bash-course ~]$ ps -l
+   F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
+   0 S 31700 59195 59194  0  80   0 - 29387 do_wai pts/0    00:00:00 bash
+   0 R 31700 59652 59195  0  80   0 - 38312 -      pts/0    00:00:00 ps
+   [1]+  Killed                  sleep 100
+   
+