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Accepted
Andrew
Asked: 2018-05-01 04:32:25 +0800 CST

How to assign variable to PROMPT_COMMAND

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How can I increment a variable assigning its value to PROMPT_COMMAND variable?

Inside .bashrc I created variable a and assigned value to 0 and then added this

a=0
PROMPT_COMMAND=`((a++))`

When I echo PROMPT_COMMAND it shows that it is empty.

bash prompt

1 Answers

  1. Best Answer

    It works with

    a=0
PROMPT_COMMAND='echo -n $((a++))'

    after you open a new shell (or source .bashrc by calling . ~/.bashrc.

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