linux练习（二）——输入输出

最新推荐文章于 2024-08-06 00:08:15 发布

局外人^旁观者

最新推荐文章于 2024-08-06 00:08:15 发布

阅读量390

点赞数

CC 4.0 BY-SA版权

分类专栏： linux练习文章标签：输入输出练习

本文链接：https://blog.youkuaiyun.com/bread_winner/article/details/94658805

linux练习专栏收录该内容

4 篇文章

订阅专栏

本文主要探讨Linux操作系统中的输入输出处理，通过实践操作详细解析输入输出重定向、管道符和进程间通信等核心概念，旨在提升对Linux系统级编程的理解。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

在这里插入图片描述

##显示当前时间，显示格式为hh:mm:ss,并保存到文件time.txt文件中
[student@localhost Desktop]$ date +%T | tee text.txt
18:23:52
[student@localhost Desktop]$ cat text.txt 
18:23:52
##显示/etc/passwd文件的第15到18行内容
[student@localhost Desktop]$ head -n 18 /etc/passwd | tail -n 4 
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin
[student@localhost Desktop]$ cat -b /etc/passwd | head -n 18 | tail -n 4 
    15	polkitd:x:999:998:User for polkitd:/:/sbin/nologin
    16	avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
    17	avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin
    18	rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin
##显示/bin中文件包含大写字母的文件，保存到bin_westos_file.txt文件中，并统计个数显示到屏幕上
[student@localhost Desktop]$ ls /bin/*[[:upper:]]* | tee bin_westos_file.txt | wc -l
5
[student@localhost Desktop]$ cat bin_westos_file.txt 
/bin/amuFormat.sh
/bin/Mail
/bin/X
/bin/Xorg
##在student用户下查找/etc下passwd文件，屏蔽错误输出
[student@localhost Desktop]$ find /etc/ -name passwd 2> /dev/null
/etc/passwd
/etc/pam.d/passwd
##在student用户下查找/etc下passwd文件，正确输出保存到/tmp/westos.out，错误输出保存到/tmp/westos.err
[student@localhost Desktop]$ find /etc/ -name passwd > /tmp/westos.out 2>/tmp/westos.err
##查看正确输出
[student@localhost Desktop]$ cat /tmp/westos.out 
/etc/passwd
/etc/pam.d/passwd
##查看错误输出
[student@localhost Desktop]$ cat /tmp/westos.err 
find: ‘/etc/pki/CA/private’: Permission denied
find: ‘/etc/pki/rsyslog’: Permission denied
find: ‘/etc/audit’: Permission denied
find: ‘/etc/polkit-1/rules.d’: Permission denied
find: ‘/etc/polkit-1/localauthority’: Permission denied
find: ‘/etc/grub.d’: Permission denied
find: ‘/etc/selinux/targeted/modules/active’: Permission denied
find: ‘/etc/lvm/archive’: Permission denied
find: ‘/etc/lvm/backup’: Permission denied
find: ‘/etc/lvm/cache’: Permission denied
find: ‘/etc/dhcp’: Permission denied
find: ‘/etc/firewalld’: Permission denied
find: ‘/etc/audisp’: Permission denied
find: ‘/etc/sudoers.d’: Permission denied
find: ‘/etc/ipsec.d’: Permission denied
find: ‘/etc/libvirt’: Permission denied
find: ‘/etc/cups/ssl’: Permission denied
##在student用户下查找/etc下passwd文件，显示命令输出并保存输出到/tmp/westos.all中（将编号为2的转变成编号为1的）
[student@localhost Desktop]$ find /etc/ -name passwd 2>&1 | tee /tmp/westos.all
find: ‘/etc/pki/CA/private’: Permission denied
find: ‘/etc/pki/rsyslog’: Permission denied
find: ‘/etc/audit’: Permission denied
/etc/passwd
find: ‘/etc/polkit-1/rules.d’: Permission denied
find: ‘/etc/polkit-1/localauthority’: Permission denied
find: ‘/etc/grub.d’: Permission denied
find: ‘/etc/selinux/targeted/modules/active’: Permission denied
/etc/pam.d/passwd
find: ‘/etc/lvm/archive’: Permission denied
find: ‘/etc/lvm/backup’: Permission denied
find: ‘/etc/lvm/cache’: Permission denied
find: ‘/etc/dhcp’: Permission denied
find: ‘/etc/firewalld’: Permission denied
find: ‘/etc/audisp’: Permission denied
find: ‘/etc/sudoers.d’: Permission denied
find: ‘/etc/ipsec.d’: Permission denied
find: ‘/etc/libvirt’: Permission denied
find: ‘/etc/cups/ssl’: Permission denied
[student@localhost Desktop]$ touch file

在这里插入图片描述