gcc -o fork fork.c./fork Thinkpad@LENOVO-77052164 ~$ gcc -o fork fork.c Thinkpad@LENOVO-77052164 ~$ ./forkThe return value is 3420The return value is 0 In father process!! In child process!! My PID is 376 My PID is 3420 Thinkpad@LENOVO-77052164 ~$ lsfork.c  fork.exe Thinkpad@LENOVO-77052164 ~$ lsexeclp.c  fork.c  fork.exe Thinkpad@LENOVO-77052164 ~$ gcc -o execlp execlp.c Thinkpad@LENOVO-77052164 ~$ lsexeclp.c  execlp.exe  fork.c  fork.exe Thinkpad@LENOVO-77052164 ~$ ./exelpbash: ./exelp: No such file or directory Thinkpad@LENOVO-77052164 ~$ ./execlp Thinkpad@LENOVO-77052164 ~$      UID     PID    PPID TTY     STIME COMMAThinkpad    3752       1 con  01:06:59 /usr/biThinkpad    1452       1 con  01:29:18 /usr/bi Thinkpad@LENOVO-77052164 ~$ lsexecle.c  execlp.c  execlp.exe  fork.c  fork.e Thinkpad@LENOVO-77052164 ~$ gcc -o execle execle.c$Thinkpad@LENOVO-77052164 ~$ ./execle Thinkpad@LENOVO-77052164 ~$ PATH=/tmpUSER=ThinkpadSYSTEMROOT=C:\WINDOWSWINDIR=C:\WINDOWS

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