Linux常用shell-作业题目解答

文件创建创建一个文件夹命名为mydir2.进入文件夹，创建一个文件，命名为myfile3.查看mydir文件夹下有哪些文件命令[tsj@VM-16-4-centos~]$ls[tsj@VM-16-4-centos~]$mkdirmydir#创建一个文件夹命名为mydir[tsj@VM-16-4-centos~]$cdmydir[tsj@VM-16-4-centosmydir]$ls[tsj@VM-16-4-centosmydir]$touchmyfile[tsj@VM-16-4-centosmydir]$lsmyfile[tsj@VM-16-4-centosmydir]$截图文件备份1.备份mydir文件夹，并命名为mydir.bak2.进入mydir.bak选择历史命令查看mydir.bak下的有哪些文件[tsj@VM-16-4-centos~]$cp-rmydir/mydir.bak[tsj@VM-16-4-centos~]$cdmydir.bak/[tsj@VM-16-4-centos~]$history[tsj@VM-16-4-centosmydir.bak]$lsmyfile截图删除&编辑文件1.删除mydir下的myfile文件2.新建一个mybash.sh的文件3.使用vim编辑mybash.sh文件，使其功能为每隔1s打印一下1到1000的计数，编辑完毕保存。4.展示mybash.sh里的内容命令[tsj@VM-16-4-centosmydir]$rmmyfile[tsj@VM-16-4-centosmydir]$vimmybash.sh[tsj@VM-16-4-centosmydir]$catmybash.shforiin`seq1000`doecho$isleep1done[tsj@VM-16-4-centosmydir]$截图查看磁盘占用1.查看机器总体磁盘占用情况2.查看mydir所在目录下有哪些文件和文件夹，以及各个文件和文件夹占用磁盘空间大小命令[tsj@VM-16-4-centosmydir]$df-hFilesystemSizeUsedAvailUse%Mountedondevtmpfs1.9G01.9G0%/devtmpfs1.9G28K1.9G1%/dev/shmtmpfs1.9G692K1.9G1%/runtmpfs1.9G01.9G0%/sys/fs/cgroup/dev/vda179G8.7G67G12%/tmpfs379M0379M0%/run/user/0tmpfs379M0379M0%/run/user/1004[tsj@VM-16-4-centosmydir]$du-sm*1mybash.sh[tsj@VM-16-4-centosmydir]$cd..[tsj@VM-16-4-centos~]$du-sm*1mydir1mydir.bak[tsj@VM-16-4-centos~]$截图修改文件权限和运行1.查看mybash.sh的拥有者、所属群组和权限2.修改权限为拥有者可读可写可执行，所属群组和其他人可读可执行不可写。并确认权限修改正确。3.运行mybash.sh文件，观察是否每隔1s打印计数4.中断mybash的运行，再用nohup在后台运行mybash，观察nohup.out日志的实时更新情况命令[tsj@VM-16-4-centosmydir]$lltotal4-rw-rw-r--1tsjtsj47Feb2722:51mybash.sh[tsj@VM-16-4-centosmydir]$chmod700mybash.sh[tsj@VM-16-4-centosmydir]$lltotal4-rwx------1tsjtsj47Feb2722:51mybash.sh[tsj@VM-16-4-centosmydir]$./mybash.sh12345678^C[tsj@VM-16-4-centosmydir]$nohup./mybash.sh&[1]9191[tsj@VM-16-4-centosmydir]$nohup:ignoringinputandappendingoutputto‘nohup.out’[tsj@VM-16-4-centosmydir]$tail-fnohup.out12345678^C[tsj@VM-16-4-centosmydir]$截图定时1.为了防止日志堆积，定时每2min清除nohup.out的日志文件中的日志内容[tsj@VM-16-4-centosmydir]$crontab-l*/2****cat/dev/null>~/mydir/nohup.out进程观察mybash脚本运行实时占用的cpu和内存找到正在运行的mybash所在进程的pidkill掉该进程，并再次确认进程是否kill掉命令[tsj@VM-16-4-centosmydir]$top-p15367[tsj@VM-16-4-centosmydir]$ps-ef|grepmybashtsj153674032023:17pts/100:00:00/bin/sh./mybash.shtsj157254032023:18pts/100:00:00grep--color=automybash[tsj@VM-16-4-centosmydir]$kill15367[1]+Terminatednohup./mybash.sh[tsj@VM-16-4-centosmydir]$ps-ef|grepmybashtsj161904032023:20pts/100:00:00grep--color=automybash截图shellscript1.编写一个shell脚本，统计当前用户最常用的指令及其对应的历史使用次数，输出最常使用的前5个指令及使用次数，格式为“指令次数”