Sometimes log files can be very large and opening them directly might freeze your system. In such cases, you can use the following commands to query the file: grep -aE '2022-03-10 15:18' wechat_open.log or cat wechat_open.log | grep -a '2022-03-10 15:58' …
When installing a plugin via yum, the error “failed: BDB1507 Thread died in Berkeley DB library” appears as shown: The fix is to execute the following commands and then reinstall: rm -f /var/lib/rpm/__db* rpm –rebuilddb #rpm database rebuild yum clean all #clean all yum cache …
To prevent accidental server operations on specific files by disallowing any changes, you can try locking the file as follows. chattr +i config.php #Using config.php as an example, -i removes the lock: chattr -i config.php #Using config.php as an example. lsattr #Check …
First, check the available versions on the website below (newer versions are generally listed): https://github.com/nodesource/distributions/tree/master/rpm Then run the following in the terminal (using Node.js 12 as an example): curl –silent –location https://rpm.nodesource.com/setup …
1. Access the server, download the uninstall script and execute it: wget http://download.bt.cn/install/bt-uninstall.shsh bt-uninstall.sh2. Follow the prompts to select the uninstall scope and complete the uninstall: …
When compiling PHP 7.4 from source, if you use the –with-mbstring flag, you need to install oniguruma. Oniguruma is a regular expression library, and the mbstring regex processing functionality in PHP 7.4 depends on this package. Therefore, before installing PHP 7.4, you must install …
cut-b 锛欳uts by bytes. These byte positions will ignore multi-byte character boundaries unless the -n flag is also specified.
-c 锛欳uts by characters.-d锛欳ustom delimiter, default is tab.-f锛歎sed with -d to specify which field to display.-n锛欴o not split multi-byte characters. Only …
centos :
last -f /var/log/btmp
last -f /var/log/btmp |grep "Fri Sep 17" #Add filter criteria to search
debian:
tail -f /var/log/auth.log
…
Find all files containing a specific string in Linux
Use grep -ri "string" or find . | xargs grep -ri …
ufw is the default firewall in Debian and Ubuntu Linux distributions. Below, we’ll look at some commonly used commands.
ufw enable #Enable ufw on boot
ufw allow 22/tcp #Allow all access to port 22
ufw default deny #Deny all by default
ufw allow from 10.0 …
