在Unix系统中,Shell程序(57)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 Current shell's PID:$$B.echo UserHome directory:$HOME echo Current shell's PID:$@C.echo UserHome directory:$LOGNAME echo Current shell's PID:$@D.echo UserHome directory:$HOME echo Current shell's PlD:$$
在Unix系统中,Shell程序(57)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 Current shell's PID:$$
B.echo UserHome directory:$HOME echo Current shell's PID:$@
C.echo UserHome directory:$LOGNAME echo Current shell's PID:$@
D.echo UserHome directory:$HOME echo Current shell's PlD:$$
相关考题:
在UNIX操作系统中,若用户键入的命令参数的个数为1时,执行cat$l命令;若用户键入的命令参数的个数为2时,执行cat>>$2<$1命令。请将下面所示的Shell程序的空缺部分补齐。Case (25) in1)cat$1 ;;2)cat>>S2<$1:;*)echo‘default...’esacA.$$B.$@C.$#D.$*
●在UNIX操作系统中,若用户键入的命令参数的个数为1时,执行cat$1命令;若用户键入的命令参数的个数为2时,执行cat$2$1命令。请将下面所示的Shell程序的空缺部分补齐。case (51) in1)cat$1;;2)cat$2$1;;*)echo# 'default……'esac(51) A.$$B.$@C.$#D.$*
运行时不会创建子进程的方式是()A.赋予shell程序文件可执行权限,直接运行shell程序(外部命令)B.调用命令解释器解释执行shell程序(Shell函数)C.使用source命令执行shell程序(内部命令)D.用()将多条命令括起来而形成的复合命令执行
Which UNIX command creates a symbolic link named myfile in the current directory to the file/etc/hosts?A.In -s/etc/hosts myfileB.In -s myfile/etc/hostsC.link -s/etc/hosts myfileD.link -s myfile/etc/hosts
在UNIX系统中,Shell程序(21)实现显示用户主目录以及当前命令的进程标识符。A.echo UserHome directory:$LOGNAME echo Current shell's PID:$$B.echo UserHome directory:$HOME echo Current shell'PID:$@C.echO UserHOme directOIy:$LOGNAME echo Current shell'sPID:$@D.echo UserHome directory:$HOME echo Current shell'sPID:$$
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操作系统中,以下Shell程序实现当用户键入的命令参数的个数为1时,执行cat$1命令;若用户键入的命令参数的个数为2时,执行cat>>$2<$1命令。 case(36)in 1)cat $1;; 2)cat>>$2<$1;; *)echo ‘default...’ esacA.$!B.$*C.$#D.$@
在UNIX操作系统中,若用户键入的命令参数的个数为1时,执行cat $1命令;若用户键入的命令参数的个数为2时,执行cat>>$2<$1命令。请将下面所示的Shell程序的空缺部分补齐。 case(1)in 1)cat $1;; 2)cat>>$2<$1 *)echo 'default...' esacA.$$B.$@C.$#D.$*
An operator wants to move all files inside the directory /home/operator to the current directory. Which of the following commands will complete the task?() A. mv /home/operator .B. mv /home/operator/* .C. mv /home/operator ../..D. mv /home/operator/all ../home/operator
在UNIX系统中,Shell程序(19)实现显示用户主目录以及当前命令的进程标识符。A.cho UserHome directory:$LOGNAME echo Carrent shell's PID:$$B.echo UserHome directory:$HOME echo Carrent shell's PID:$@C.echo UserHome directory:$ LOGNAME echo Carrent shell's PID:S@D.echo UserHome directory:$HOME echo Carrent shell's PID:$$
查找/etc下文件内容中以shell开头或以shell结尾,且与shell大小写无关的文件及其相应行(不包括错误信息和父目录),以下命令正确的是()。A、grep –s -I -E、“^shellB、grep –s -E、“^shellC、grep –s -i “^shellD、grep -I -E、“^shell
关于常用Linux环境变量的用途,下列说法中,正确的是()A、PATH变量决定了shell将到哪些目录中寻找命令和程序B、HOME变量制定了当前用户的主目录C、SHELL变量记录了当前用户使用的是哪种ShellD、LOGNAME变量记录了当前用户的登录名E、HISTSIZE变量指定了保存历史命令记录的条数
linux系统中,以下显示结果相同的是()。A、echo The current working path is $PWD.B、echo "The current working path is $PWD." Echo helloC、echo 'The current working path is $PWD.' Echo helloD、echo "The current working path is `pwd`."E、echo The current working path is $PWD. Echo hello
下面有关shell的说法正确的是()。A、shell是linux核心程序B、shell是操作员使用的程序C、shell是用户与Linux操作系统内核之间的接口D、shell是Windows的命令行程序
运行时不会创建子进程的方式是()。A、赋予shell程序文件可执行权限,直接运行shell程序(外部命令)B、调用命令解释器解释执行shell程序(Shell函数)C、使用source命令执行shell程序(内部命令)D、用()将多条命令括起来而形成的复合命令执行
linux系统中,以下显示结果不同的是()。A、echo The current working path is $PWD.B、echo 'The current working path is $PWD.'C、echo "The current working path is $PWD."D、echo "The current working path is `pwd`."
关于Unix系统不正确的叙述是:()。A、Unix由内核和外壳两部分组成B、系统程序在核心态运行C、终端用户通过shell使用系统D、仅当一条shell命令执行完成以后,才能打入下一条shell命令
An operator wants to move all files inside the directory /home/operator to the current directory. Which of the following commands will complete the task?()A、mv /home/operator .B、mv /home/operator/* .C、mv /home/operator ../..D、mv /home/operator/all ../home/operator
A user would like their shell prompt to reflect the current directory. Which of the following environment variables can be set to accomplish this?()A、PS1B、PATHC、PROMPTD、LOCPATH
What is the correct command to display the current working directory?()A、echo $PWDB、echo $pwdC、echo $CWDD、echo $cwd
单选题关于Unix系统不正确的叙述是:()。AUnix由内核和外壳两部分组成B系统程序在核心态运行C终端用户通过shell使用系统D仅当一条shell命令执行完成以后,才能打入下一条shell命令
多选题linux系统中,以下显示结果相同的是()。Aecho The current working path is $PWD.Becho The current working path is $PWD. Echo helloCecho 'The current working path is $PWD.' Echo helloDecho The current working path is `pwd`.Eecho The current working path is $PWD. Echo hello