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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