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I am trying to make a custom command prompt that looks like this: [][][][]$, where the [] can be filled with custom information. For example, if I write in the console . file.sh 0 2 "date -R" then the command prompt looks like this [Sat, 29 Aug 2020 11:02:40 +0200][][][]$ the 0 stands for position, and 2 stands for the type of the value (1 is string, 2 is command which is in this example, and 3 is a csv file) Basically, I want my command prompt to be dynamic, so every time I hit enter the values should be updated (not all values have to be updated, for example string stays the same all the time, or a csv column.) So when I hit enter I want my prompt go from [Sat, 29 Aug 2020 11:02:40 +0200][][][]$ to [Sat, 29 Aug 2020 11:02:45 +0200][][][]$ for example. Here is my full code:

#!/bin/bash updatedata() { v=$(awk -v strSearch="$1" ' BEGIN{ FS=";" } { gsub(/\r/,"") for(i=1;i<=NF;i++){ if($i==strSearch){ print i exit } } } ' data.csv) sum=0 for x in `cut -f $v -d ';' data.csv` do x="${x/$'\r'/}" let sum=$sum+$x done if [ $pos -eq 0 ] then v0=$sum elif [ $pos -eq 1 ] then v1=$sum elif [ $pos -eq 2 ] then v2=$sum elif [ $pos -eq 3 ] then v3=$sum fi } while [ "$#" -gt 0 ]; do pos=$1 typevar=$2 stringvar=$3 case $pos in 0) v0=$3 ;; 1) v1=$3 ;; 2) v2=$3 ;; 3) v3=$3 ;; *) echo "One of the values has invalid position entered, try again" esac case $typevar in 1) if [ $pos -eq 0 ] then if [ "$stringvar" != "null" ] then v0=$stringvar else v0="" fi elif [ $pos -eq 1 ] then if [ "$stringvar" != "null" ] then v1=$stringvar else v1="" fi elif [ $pos -eq 2 ] then if [ "$stringvar" != "null" ] then v2=$stringvar else v2="" fi elif [ $pos -eq 3 ] then if [ "$stringvar" != "null" ] then v3=$stringvar else v3="" fi fi ;; 2) if [ $pos -eq 0 ] then v0=`eval $3` elif [ $pos -eq 1 ] then v1=`eval $3` elif [ $pos -eq 2 ] then v2=`eval $3` elif [ $pos -eq 3 ] then v3=`eval $3` fi ;; 3) updatedata $3 ;; *) echo "Invalid type of variable, try again" esac shift shift shift done export PS1="[$v0][$v1][$v2][$v3]$"

I tried using export for the PS1, didn't work. I also tried using single quoted for the PS1 like this: export PS1='[$v0][$v1][$v2][$v3]$' and that didn't work either. I also tried to do this: export PS1='[$(v0)][$(v1)][$(v2)][$(v3)]$' and that didn't work either. I don't know what to do!

example of CSV file:

Date_of_report;Municipality_code;Municipality_name;Province;Total_reported;Hospital_admission;Deceased 2020-03-13 10:00:00;GM0003;Appingedam;Groningen;0;0;0 2020-03-13 10:00:00;GM0010;Delfzijl;Groningen;0;0;0 2020-03-13 10:00:00;GM0014;Groningen;Groningen;3;0;0 2020-03-13 10:00:00;GM0024;Loppersum;Groningen;0;0;0 2020-03-13 10:00:00;GM0034;Almere;Flevoland;1;1;0 2020-03-13 10:00:00;GM0037;Stadskanaal;Groningen;0;0;0 2020-03-13 10:00:00;GM0047;Veendam;Groningen;0;0;0 2020-03-13 10:00:00;GM0050;Zeewolde;Flevoland;1;0;0 2020-03-13 10:00:00;GM0059;Achtkarspelen;Friesland;0;0;0 2020-03-13 10:00:00;GM0060;Ameland;Friesland;0;0;0 2020-03-13 10:00:00;GM0072;Harlingen;Friesland;0;0;0 2020-03-13 10:00:00;GM0074;Heerenveen;Friesland;0;0;0
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Your script currently only updates the prompt when it is explicitly sourced. If you want it to run every time the prompt refreshes, I think you need to use PROMPT_COMMAND.

Try the following modified script. This will call the function set_prompt to update the prompt every time. I've also exported the commands to generate the text so that they can be run again to update when you get a new prompt. Using your example command of . file.sh 0 2 "date -R", I can then see the date update when I press enter.

#!/bin/bash updatedata() { v=$(awk -v strSearch="$1" ' BEGIN{ FS=";" } { gsub(/\r/,"") for(i=1;i<=NF;i++){ if($i==strSearch){ print i exit } } } ' data.csv) sum=0 for x in `cut -f $v -d ';' data.csv` do x="${x/$'\r'/}" let sum=$sum+$x done echo $sum } while [ "$#" -gt 0 ]; do pos=$1 typevar=$2 stringvar=$3 case $pos in 0) v0=$3 ;; 1) v1=$3 ;; 2) v2=$3 ;; 3) v3=$3 ;; *) echo "One of the values has invalid position entered, try again" esac case $typevar in 1) if [ $pos -eq 0 ] then if [ "$stringvar" != "null" ] then export PROMPT0="echo $stringvar" else export PROMPT0="" fi elif [ $pos -eq 1 ] then if [ "$stringvar" != "null" ] then export PROMPT1="echo $stringvar" else export PROMPT1="" fi elif [ $pos -eq 2 ] then if [ "$stringvar" != "null" ] then export PROMPT2="echo $stringvar" else export PROMPT2="" fi elif [ $pos -eq 3 ] then if [ "$stringvar" != "null" ] then export PROMPT3="echo $stringvar" else export PROMPT3="" fi fi ;; 2) if [ $pos -eq 0 ] then export PROMPT0="exec $3" elif [ $pos -eq 1 ] then export PROMPT1="exec $3" elif [ $pos -eq 2 ] then export PROMPT2="exec $3" elif [ $pos -eq 3 ] then export PROMPT3="exec $3" fi ;; 3) if [ $pos -eq 0 ] then export PROMPT0="updatedata $3" elif [ $pos -eq 1 ] then export PROMPT1="updatedata $3" elif [ $pos -eq 2 ] then export PROMPT2="updatedata $3" elif [ $pos -eq 3 ] then export PROMPT3="updatedata $3" fi ;; *) echo "Invalid type of variable, try again" esac shift shift shift done function set_prompt() { v0=$($PROMPT0) v1=$($PROMPT1) v2=$($PROMPT2) v3=$($PROMPT3) export PS1="[$v0][$v1][$v2][$v3]$" } export PROMPT_COMMAND=set_prompt
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  • Hi thanks a lot for your answer, the updating command works. But the csv doesnt work anymore, i was trying to sum the values of the specific column. When i try to execute for exame . infk.sh 0 2 "date -R" 1 3 Deceased, and I press enter, the whole csv gets printed and gives me error 'error token' Commented Aug 30, 2020 at 15:34
  • @anon can you upload an example of your CSV file? Is "Deceased" a header for one of the columns? Commented Aug 30, 2020 at 15:42
  • HI, i added the example of csv to my post, deceased is a header for one of the columns yes. Commented Aug 30, 2020 at 15:46
  • @anon try my edit Commented Aug 30, 2020 at 16:00
  • Thank you so much, everything works now. You saved me haha Commented Aug 30, 2020 at 16:21

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