18. Another way to write backtracking problem deduplication If it is repeated under the same parent node, the subset problem must be sorted. You can use set to deduplicate this layer. If it is reloaded from the parent node in this layer, the used array should be written in backtracking, and the backtracking is preceded […]
Tag: sudo
Ordinary users in Linux cannot use the sudo command
Linux directory structure /bin: bin is the abbreviation of Binaries (binary files), this directory stores the most frequently used commands. /boot: Here are some core files used when starting Linux, including some connection files and mirror files. /dev :dev is the abbreviation of Device (device). This directory stores the external devices of Linux. The way […]
61. Use sudo to achieve authorization
sudo introduction sudo: superuser do, that is, execute with a super user, the configuration file is /etc/sudoers; sudo needs to enter the user password, and there is no need to enter the password again within 5 minutes after entering sudo features: 1. Able to authorize specified users to run certain commands on specified hosts 2. […]
Penetration testing: The third issue of sudo method of Linux privilege escalation (3)
Directory write at the beginning sudo jjs sudo journalctl sudo knife sudo less sudo man sudo more sudo mount sudo mysql sudo nano sudo neofetch sudo nice sudo nmap sudo node sudo nohup sudo openvpn sudo passwd sudo perl sudo php sudo pico sudo pkexec sudo python3 sudo rvim sudo scp Summary and reflection Written […]
Penetration testing: The second phase of sudo method of Linux privilege escalation (2)
Directory write at the beginning sudo expect sudo fail2ban sudo find sudo flock sudo ftp sudo gcc sudo gdb sudo git sudo gzip/gunzip sudo iftop sudo hping3 sudo java Summary and reflection Written at the beginning This article continues to explain the sudo privilege escalation method for penetration testing on the basis of the previous […]
Penetration testing: Lecture on Linux privilege escalation (1) sudo method Phase 1
Directory write at the beginning CVE-2019-14287 sudo apt and sudo apt-get sudo apache2 sudo ash sudo awk sudo base32/58/64/nc/z sudo cp sudo cpulimit sudo curl sudo date sudo dd sudo dstat sudo ed sudo env sudo exiftools Summary and reflection Written at the beginning After performing a penetration test to obtain the shell of the […]
linux—“user operation/su and sudo/normal authority/special authority/decompression compression/software management, rpm and yum/source code installation nginx
User actions ####Create User### #1 Create sa and sutdents groups group add sa group add students # 2 Users can belong to multiple groups, only one primary group, and additional groups can have multiple G useradd -u 5001 -g students -G sa -c “Notes” -s /bin/bash lqz666 # 3 Set password passwd lqz666 # 4 […]
After the sudo apt update command W: An error occurred while verifying the digital signature. This repository has not been updated, so the previous index file is still used. GPG error: http://robotpkg.openrobots.org/packages
yan@RO:/etc/apt/sources.list.d$ sudo apt update Get: 1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB] Hits: 2 http://packages.ros.org/ros/ubuntu focal InRelease Hits: 3 http://ppa.launchpad.net/git-core/ppa/ubuntu focal InRelease Hits: 4 http://cn.archive.ubuntu.com/ubuntu focal InRelease Hits: 5 http://cn.archive.ubuntu.com/ubuntu focal-updates InRelease Hits: 6 https://deb.nodesource.com/node_16.x focal InRelease Get: 7 http://cn.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB] Ignore:8 http://robotpkg.openrobots.org/packages/debian/pub focal InRelease Hits: 9 http://robotpkg.openrobots.org/packages/debian/pub focal Release Error: 10 http://robotpkg.openrobots.org/packages/debian/pub […]
Sudoku (16*16) DFS pruning optimization solution
DFS special collection: DFS Connectivity Model DFS pruning and optimization It is said that filling Sudoku with DLX is the fastest, I don’t know DLX, so I use DFS and optimize infinitely. Only some optimization operations are described here. One: Optimization order: With 9*9 Sudoku, we find the lattice point that can be filled with […]
sudo pip3 –no-cache-dir install -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple/
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