ubuntu useful command

本文介绍在Linux环境下如何使用grep、tee和awk等命令进行日志文件的搜索、保存及数据提取,帮助读者掌握高效处理日志的方法。

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1.search string in folder

grep -r string ./

2.将ubuntu终端输出保存为日志

2>&1 | tee /path/name.log

3.从log文件中查找迭代次数和损失并记录为文件

grep Iteration mnist.log | grep loss | awk '{print $6 $9}' | sed 's/\,//' > loss.data

### Ubuntu 24.04 Wireless Network Card Configuration and Troubleshooting #### Configuring the Wireless Network Adapter To configure a wireless network adapter on Ubuntu 24.04, ensure that all necessary drivers are installed correctly. If using proprietary drivers, these can be enabled through the Additional Drivers utility found within Software & Updates application. For manual installation of drivers or updates: ```bash sudo apt update && sudo apt upgrade -y ``` If specific firmware is required for the wireless card to function properly, install it via: ```bash sudo apt-get install linux-firmware ``` After ensuring driver availability, verify whether the system recognizes the wireless interface by running `ifconfig` or `ip link`. For more detailed information about available interfaces including those not yet configured, use `iwconfig`. #### Checking Driver Installation Status Check if the correct kernel module (driver) loads automatically at boot time with: ```bash lsmod | grep <wireless_module_name> ``` Replace `<wireless_module_name>` with your actual device's corresponding Linux driver name like iwlwifi for Intel cards. #### Diagnosing Connectivity Issues When facing connectivity issues, start diagnostics from checking hardware switch states and software blocks such as rfkill list all which shows any blocked radios. Use dmesg logs filtered around wlan keywords to look into potential problems during initialization phases: ```bash dmesg | grep -i wlan ``` Another useful command line tool specifically designed for diagnosing Wi-Fi related troubles is `nmcli`, part of NetworkManager suite; this allows viewing active connections along with their statuses among other functionalities. #### Resolving Common Problems Some common solutions include reinstalling the network manager service after making changes to configurations files located under `/etc/NetworkManager/conf.d/` directory path or reloading its daemon without restarting whole machine services: ```bash sudo systemctl restart NetworkManager.service ``` Or directly reload configuration while preserving current state: ```bash sudo nmcli con reload ``` In cases where secure connection establishment fails due to outdated certificates store causing handshake failures between client and access point, updating CA package might help resolve SSL/TLS errors encountered when connecting over WPA/WPA2 secured networks: ```bash sudo apt-get install --reinstall ca-certificates ``` #### Advanced Debugging Tools Advanced users may find value in tools like `tcpdump` capturing live traffic packets passing through specified interfaces helping pinpoint exact moment things go wrong inside communication flow process level details. ```bash sudo tcpdump -i wlp3s0 ``` Here replace `wlp3s0` with appropriate identifier obtained earlier from commands mentioned above. ---
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