Differences

This shows you the differences between two versions of the page.

--- linux:linux_tips [2021/01/01 21:25]
127.0.0.1 external edit
+++ linux:linux_tips [2023/11/15 18:07] (current)
manu
@@ Line 22: / Line 22: @@
 install the basic desktop on CentOS:
   yum groupinstall basic-desktop
+===== Screen =====
+Screen is deprecated into Redhat, now replaced by **TMUX**
+https://www.redhat.com/sysadmin/introduction-tmux-linux
+TMUX is a terminal using a background session, so you can run long process without being disconnected from TIMEOUT (TMOUT)
+<cli prompt='$'>
+$ tmux
+</cli>
+{{linux:tmux01.png?500}}
+**For HELP**
+  You can now run your first Tmux command. For example, to get a list of all commands, you would type:
+  Ctrl+b ?
+To start using tmux, type tmux on your terminal. This command launches a tmux server, creates a default session (number 0) with a single window, and attaches to it.
+You can detach from your tmux session by pressing **Ctrl+B** then **D**. Tmux operates using a series of keybindings (keyboard shortcuts) triggered by pressing the "prefix" combination. By default, the prefix is Ctrl+B. After that, press D to detach from the current session.
+List you background sessions
+<cli prompt='$'>
+$ tmux ls
+: 1 windows (created Sat Aug 27 20:54:58 2022)
+</cli>
+Connect to session number 0 (or maybe attach-session ?)
+<cli prompt='$'>
+$ tmux attach -t 0
+</cli>
+As you can see, the command continued to run and print messages on the screen. You can type Ctrl+C to cancel it.
+Satart a session with specific name
+  tmux new -s Session1
+TMUX options
+  * Ctrl+B D — Detach from the current session.
+  * Ctrl+B % — Split the window into two panes horizontally.
+  * Ctrl+B " — Split the window into two panes vertically.
+  * Ctrl+B Arrow Key (Left, Right, Up, Down) — Move between panes.
+  * Ctrl+B X — Close pane.
+  * Ctrl+B C — Create a new window.
+  * Ctrl+B N or P — Move to the next or previous window.
+  * Ctrl+B 0 (1,2...) — Move to a specific window by number.
+  * Ctrl+B : — Enter the command line to type commands. Tab completion is available.
+  * Ctrl+B ? — View all keybindings. Press Q to exit.
+  * Ctrl+B W — Open a panel to navigate across windows in multiple sessions.
+then toggle the mouse on (or off) with the command set -g mouse.
+Using colors:
+  Change the status bar background color: set -g status-bg cyan
+  Change inactive window color: set -g window-status-style bg=yellow
+  Change active window color: set -g window-status-current-style bg=red,fg=white
+=== Configure tmux ===
+You can change the tmux configuration permanently by modifying the tmux configuration file. By default, this file is located at $HOME/.tmux.conf.
+For example, the default prefix key combination is Ctrl+B, but sometimes this combination is a little awkward to press, and it requires both hands. You can change it to something different by editing the configuration file. I like to set the prefix key to Ctrl+A. To do this, create a new configuration file and add these lines to it:
+<cli prompt='$'>
+$ cat $HOME/.tmux.conf
+# Set the prefix to Ctrl+a
+set -g prefix C-a
+# Remove the old prefix
+unbind C-b
+# Send Ctrl+a to applications by pressing it twice
+bind C-a send-prefix
+</cli>
+Another example
+<code>
+# Improve colors
+set -g default-terminal 'screen-256color'
+# Set scrollback buffer to 10000
+set -g history-limit 10000
+# Customize the status line
+set -g status-fg  green
+set -g status-bg  black
+</code>
+=== Screen ===
+//Only for historic info//
+Screen (command) is a background terminal, you can start applications in background, quit your windows and recall your session.
+Start a sceen session using a specific name
+<cli prompt='#'>
+# screen -S session_name
+</cli>
+Help
+  Ctrl+a ?
+Below are some most common commands for managing Linux Screen Windows:
+  * Ctrl+a c Create a new window (with shell).
+  * Ctrl+a " List all windows.
+  * Ctrl+a 0 Switch to window 0 (by number).
+  * Ctrl+a A Rename the current window.
+  * Ctrl+a S Split current region horizontally into two regions.
+  * Ctrl+a | Split current region vertically into two regions.
+  * Ctrl+a tab Switch the input focus to the next region.
+  * Ctrl+a Ctrl+a Toggle between the current and previous windows
+  * Ctrl+a Q Close all regions but the current one.
+  * Ctrl+a X Close the current region.
+You can detach from the screen session at any time by typing:
+  Ctrl+a d
+Reattach to a Linux Screen:
+  screen -r
+To find the session ID list the current running screen sessions with:
+<cli prompt='#'>
+# screen -ls
+There are screens on:
+.pts-0.linuxize-desktop   (Detached)
+.pts-0.linuxize-desktop   (Detached)
+Sockets in /run/screens/S-linuxize.
+</cli>
+If you want to restore screen 10835.pts-0, then type the following command:
+  screen -r 10835
+===== limit a process =====
+You can easily limit CPU usage with cpulimit command like:
+<cli prompt='#'>
+# cpulimit -l 10 -- /usr/bin/clamscan -r / --exclude-dir=/sys/ --quiet --infected > /var/log/clamscan/clamscan.$(date +%Y%m%d).log
+</cli>

wiki

User Tools

Site Tools

Differences

Page Tools