在UNIX系统中,Shell程序______实现显示用户主目录以及当前命令的进程标识符。A.echo UserHome directorY:$LOGNAMEecho Carrent shell'Ss PID:$$B.echo UserHome directory:$HOMEecho Carrent shell'PID:$@C.echo UserHome directory:$LOGNAMEecho Carrent shell's PID:$@D.echo UserHome directory:$HOMEecho Carrent shell's PID:$$A.B.C.D.

在UNIX系统中,Shell程序______实现显示用户主目录以及当前命令的进程标识符。

A.echo UserHome directorY:$LOGNAME

echo Carrent shell'Ss PID:$$

B.echo UserHome directory:$HOME

echo Carrent shell'PID:$@

C.echo UserHome directory:$LOGNAME

echo Carrent shell's PID:$@

D.echo UserHome directory:$HOME

echo Carrent shell's PID:$$

A.

B.

C.

D.


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