LinuxShell_semaphore

send signal by using KILL

指令操作語法
```
    [kill [-signal] pid]
```

終止

    ^C
    
    ^D // Unix 不支援

    [kill [-1] pid] // 掛斷 訊號名稱：SIGHUP

    [kill [-9] pid] // 強迫終止 訊號名稱：SIGKILL

    [kill [-15] pid] // 終止 訊號名稱：SIGTERM

暫停
```
    ^Z // 暫停執行 suspend
```
execution in foreground
```
$ fg <cmd>
```
https://github.com/QueenieCplusplus/LinuxShell_fgbg/blob/master/README.md#foreground-前景執行
execution in background
```
$ bg <cmd> 
```
https://github.com/QueenieCplusplus/LinuxShell_fgbg/blob/master/README.md#background-背景執行

help

    ✗ kill -l

   HUP 
   INT 
   QUIT 
   ILL 
   TRAP 
   ABRT 
   EMT 
   FPE 
   KILL 
   BUS 
   SEGV 
   SYS 
   PIPE 
   ALRM 
   TERM 
   URG 
   STOP 
   TSTP 
   CONT 
   CHLD 
   TTIN 
   TTOU 
   IO 
   XCPU 
   XFSZ 
   VTALRM 
   PROF 
   WINCH 
   INFO 
   USR1 
   USR2

QueenieCplusplus/LinuxShell_semaphore

LinuxShell_semaphore