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--- utils_commands [2020/05/07 10:09]
xavier [Disk usage]
+++ utils_commands [2020/06/06 11:42] (current)
xavier
@@ Line 1: / Line 1: @@
 ====== Useful commands ======
+===== Error investigation =====
+Unfreeze PC at kernel level:\\
+[[https://en.wikipedia.org/wiki/Magic_SysRq_key#Common_Usage]]\\
+Show error and warning messages:\\
+''# dmesg -T --level=err,warn''\\
+Monitor message in real time:\\
+''# dmesg -Tx --follow''\\
+Test RAM:\\
+''# apt-get install memtester''\\
+''# memtester 1024 5''\\
+(allocate 1024Mo and repeat 5 times)\\
 ===== Data management =====
 ==== File and directory size ====
@@ Line 23: / Line 42: @@
 Execute command : -a for archive (keep files structure + recursive...), -v for verbose, --delete-after to delete files in backup directory if they do not exist in source (moved, renamed, ...)\\
 ''$ rsync -av --delete-after /source/ /destination/''\\
+===== User management =====
+==== Users ====
+Create user:\\
+''$ sudo useradd -m username''\\
+Set password:\\
+''$ sudo passwd username''\\
+==== Groups ====
+Create group:\\
+''$ sudo addgroup goupname''\\
+Config file:\\
+''/etc/group''\\
+Add user to group:\\
+''$ sudo usermod -a -G groupname username''\\
+===== Packages =====
+List installed packages:\\
+''sudo apt list --installed''\\

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