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February 20, 2021 11:02 pm GMT

Make Your Tmux Status Bar 100% Better With Bash

Did you know that you can easily have a Bash script display information on the Tmux status bar? Because of that the possibilities are almost endless. You can display all sorts of valuable information such as:

  • Hostname
  • IP address
  • Netmask
  • Gateway
  • Memory usage
  • Memory total
  • CPU temperature
  • System load
  • Battery meter
  • VPN status
  • Time
  • Date
  • Weather report
  • Git status
  • Whatever is important to you

I will show you how to create a modular Bash script to display useful information in the status bar. There are a lot of plug-ins you could install for Tmux but engineering things yourself is a lot of fun. I will create a separate function for each status bar item to make the script modular, that way we will only call the functions that we need.

Here is the default status bar.

tmux-default-status-bar.png

Here is the status bar customized.

tmux-status-bar-improved.png

Requirments

  • lm-sensors
  • bc
  • acpi

Check your Tmux version. I am using version 2.8.

$ tmux -Vtmux 2.8
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If you do not have a .tmux.conf create one in your home directory.

$ touch .tmux.conf
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In the .tmux.conf make sure you have the following lines.

# Status barset -g status onset -g status-interval 1set -g status-justify centre # Careful! It is spelled centre not center.set -g status-style fg=white,bg=black# Status Bar Left sideset -g status-left-length 50set -g status-left-style defaultset -g status-left "#h #( ~/.tmux/left_status.sh )"# Status Bar Right sideset -g status-right-length 40set -g status-right-style defaultset -g status-right "#( ~/.tmux/right_status.sh )"
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Make a hidden folder in your home directory to save your Bash scripts.

$ mkdir .tmux
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Make two Bash scripts, one for the left side, one for the right.

$ touch ~/.tmux/right_status.sh$ touch ~/.tmux/left_status.sh
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The scripts are currently not executable ( rw-r--r-- ).

$ ls -lF ~/.tmux/*.sh-rw-r--r-- 1 bw bw    0 Feb 19 18:44 /home/bw/.tmux/right_status.sh-rw-r--r-- 1 bw bw    0 Feb 19 18:44 /home/bw/.tmux/left_status.sh
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Make the scripts executable so they will run.

$ chmod +x ~/.tmux/right_status.sh$ chmod +x ~/.tmux/left_status.sh
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The scripts are now executable ( rwxr-xr-x ).

$ ls -lF ~/.tmux/*.sh-rwxr-xr-x 1 bw bw    0 Feb 19 18:44 /home/bw/.tmux/right_status.sh*-rwxr-xr-x 1 bw bw    0 Feb 19 18:44 /home/bw/.tmux/left_status.sh*
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Left Side

tmux-status-left-side.png

First edit the left_status.sh script. Add the following content. The ip_address function displays the IP address and netmask.

$ vim ~/.tmux/left_status.sh

#!/bin/bashfunction ip_address() {    # Create an empty array.    interface_arr=()    # Loop through the available interfaces.    for i in $(ls -1 /sys/class/net/); do        # Add every interface to the array except for the loopback device.        if [ "$i" != 'lo' ]; then            interface_arr+=($i)        fi    done    # Loop through the array of interfaces. Check to see which interface is up.    for j in ${interface_arr[@]}; do        if [ "$(cat /sys/class/net/${j}/operstate)" == "up" ]; then            local iface="${j}"        else            local iface=""        fi    done    if [ ! -z "$iface" ]; then        # Print the ip address of the interface.        printf " %s  " "$(ip addr show $iface | awk '/inet /{print $2}')"     fi}
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Underneath the IP address function add the CPU function. You must install lm-sensors for this to work. Run these two commands.

$ sudo apt install lm-sensors$ sudo sensors-detect
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Run the sensors command to see the output.

# Celcius$ sensorsacpitz-acpi-0Adapter: ACPI interfacetemp1:        +27.8C  (crit = +105.0C)temp2:        +29.8C  (crit = +105.0C)# Fahrenheit$ sensors -facpitz-acpi-0Adapter: ACPI interfacetemp1:        +82.0F  (crit = +221.0F)temp2:        +85.6F  (crit = +221.0F)
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Add the cpu_temperature function below the ip_address function.

function cpu_temperature() {    # Display the temperature of CPU core 0 and core 1.    sensors -f | awk '/Core 0/{printf $3" "}/Core 1/{printf $3" "}'}
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To see the memory usage we will add a memory_usage function. We need the bc command to calculate the percentage of memory used.

Install bc command.

$ sudo apt install bc
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Add the memory_usage function to the script.

function memory_usage() {    if [ "$(which bc)" ]; then        # Display used, total, and percentage of memory using the free command.        read used total <<< $(free -m | awk '/Mem/{printf $2" "$3}')        # Calculate the percentage of memory used with bc.        percent=$(bc -l <<< "100 * $total / $used")        # Feed the variables into awk and print the values with formating.        awk -v u=$used -v t=$total -v p=$percent 'BEGIN {printf "%sMi/%sMi %.1f%", t, u, p}'    fi}
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The next function will display if the VPN is up by checking for the tun0 interface.

function vpn_connection() {    # Check for tun0 interface.    [ -d /sys/class/net/tun0 ] && printf "%s " 'VPN*'}
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To complete the left_status.sh script we will use a main function to call the other functions.

function main() {    # Comment out any function you do not need.     ip_address    cpu_temperature    memory_usage    vpn_connection}# Calling the main function which will call the other functions.main
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Right Side

tmux-status-right-side.png

Now lets configure the right side.

$ vim ~/.tmux/right_status.sh

The battery meter function displays the level of the battery and changes color depending on the battery level.
We need the acpi program for this.

$ apt install acpi
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Run acpi to see the output.

$ acpiBattery 0: Unknown, 96%
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Add the battery_meter function to the Bash script.

$ vim ~/.tmux/right_status.sh

#!/bin/bashfunction battery_meter() {    if [ "$(which acpi)" ]; then        if [ "$(cat /sys/class/power_supply/AC/online)" == 1 ] ; then            charging='+'         else            charging='-'        fi        # Check for existence of a battery.        if [ -x /sys/class/power_supply/BAT0 ] ; then            batt0=$(acpi -b 2> /dev/null | awk '/Battery 0/{print $4}' | cut -d, -f1)            case $batt0 in                100%|9[0-9]%|8[0-9]%|7[5-9]%) fgcolor='#[fg=brightgrey]'                     ;;                7[0-4]%|6[0-9]%|5[0-9]%) fgcolor='#[fg=brightgreen]'                     ;;                4[0-9]%|3[0-9]%|2[5-9]%) fgcolor='#[fg=brightyellow]'                     ;;                2[0-4]%|1[0-9]%|[0-9]%) fgcolor='#[fg=brightred]'                    ;;            esac            # Display the percentage of charge the battery has.            printf  %s  "${fgcolor}${charging}${batt0}${fgdefault}"        fi    fi}
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The next function will add to the script is to get the load average using the uptime command.

function load_average() {    printf "%s " "$(uptime | awk -F: '{printf $NF}' | tr -d ',')"}
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To see the time, date, and timezone add the date_time function to the Bash script.

function date_time() {    printf "%s " "$(date +'%Y-%m-%d %H:%M:%S %Z')"}
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The last function is the main function which calls the other functions.

function main() {    battery_meter    load_average    date_time}# Calling the main function which will call the other functions.main
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Complete Script

$ cat ~/.tmux/left_status.sh

#!/bin/bashfunction ip_address() {    # Create an empty array.    interface_arr=()    # Loop through the available interfaces.    for i in $(ls -1 /sys/class/net/); do        # Add every interface to the array except for the loopback device.        if [ "$i" != 'lo' ]; then            interface_arr+=($i)        fi    done    # Loop through the array of interfaces. Check to see which interface is up.    for j in ${interface_arr[@]}; do        if [ "$(cat /sys/class/net/${j}/operstate)" == "up" ]; then            local iface="${j}"        else            local iface=""        fi    done    if [ ! -z "$iface" ]; then        # Print the ip address of the interface.        printf " %s  " "$(ip addr show $iface | awk '/inet /{print $2}')"     fi}function cpu_temperature() {    # Display the temperature of CPU core 0 and core 1.    sensors -f | awk '/Core 0/{printf $3" "}/Core 1/{printf $3" "}'}function memory_usage() {    if [ "$(which bc)" ]; then        # Display used, total, and percentage of memory using the free command.        read used total <<< $(free -m | awk '/Mem/{printf $2" "$3}')        # Calculate the percentage of memory used with bc.        percent=$(bc -l <<< "100 * $total / $used")        # Feed the variables into awk and print the values with formating.        awk -v u=$used -v t=$total -v p=$percent 'BEGIN {printf "%sMi/%sMi %.1f%", t, u, p}'    fi}function vpn_connection() {    # Check for tun0 interface.    [ -d /sys/class/net/tun0 ] && printf "%s " 'VPN*'}function main() {    # Comment out any function you do not need.     ip_address    cpu_temperature    memory_usage    vpn_connection}# Calling the main function which will call the other functions.main
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$ cat ~/.tmux/right_status.sh

#!/bin/bashfunction battery_meter() {    if [ "$(which acpi)" ]; then        if [ "$(cat /sys/class/power_supply/AC/online)" == 1 ] ; then            charging='+'         else            charging='-'        fi        # Check for existence of a battery.        if [ -x /sys/class/power_supply/BAT0 ] ; then            batt0=$(acpi -b 2> /dev/null | awk '/Battery 0/{print $4}' | cut -d, -f1)            case $batt0 in                100%|9[0-9]%|8[0-9]%|7[5-9]%) fgcolor='#[fg=brightgrey]'                     ;;                7[0-4]%|6[0-9]%|5[0-9]%) fgcolor='#[fg=brightgreen]'                     ;;                4[0-9]%|3[0-9]%|2[5-9]%) fgcolor='#[fg=brightyellow]'                     ;;                2[0-4]%|1[0-9]%|[0-9]%) fgcolor='#[fg=brightred]'                    ;;            esac            # Display the percentage of charge the battery has.            printf  %s  "${fgcolor}${charging}${batt0}${fgdefault}"        fi    fi}function load_average() {    printf "%s " "$(uptime | awk -F: '{printf $NF}' | tr -d ',')"}function date_time() {    printf "%s " "$(date +'%Y-%m-%d %H:%M:%S %Z')"}function main() {    battery_meter    load_average    date_time}# Calling the main function which will call the other functions.main
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Feel free to leave comment, questions, and suggestions.


Original Link: https://dev.to/brandonwallace/make-your-tmux-status-bar-100-better-with-bash-2fne

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