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I added a directory path to system path($PATH) by running,

export PATH=$PATH:/home/avinash/Desktop/raj

Now my path look like this,

$ echo $PATH
/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/avinash/Desktop/raj

I want to remove /home/avinash/Desktop/raj from system path variable by using command(like export command does on adding path).

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where did you put the export statement? –  souravc Mar 12 at 17:50
    
gnome terminal(ctrl+alt+t) –  Avinash Raj Mar 12 at 17:52

4 Answers 4

up vote 4 down vote accepted

Running export PATH=$PATH:/... doesn't set your PATH system-wide. It's just a shell variable. Start a new shell and BOOM, it's gone. Obviously if you've added that to ~/.bashrc (or another environment bootstrap file) you'll have to revert that change but it doesn't sound like your problem here.

If you're desperate not to start a new shell, you could set it by removing it manually, with:

export PATH=/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
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In your current shell (your current session of gnome-terminal) you can do this using:

export PATH=${PATH%:/home/avinash/Desktop/raj}

In general:

${string%substring}

deletes shortest match of $substring from back of $string.

Check out String manipulation for more info.

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If you put the export statement in any shell initiation file like ~/.bashrc, you can use the following commands in terminal,

#remove the export statement from the file.
sed -i 's#export PATH=$PATH:/home/avinash/Desktop/raj##g' ~/.bashrc
#source ~/.bashrc
. ~/.bashrc

It will remove the folder from path.

If you have exported the path from a terminal

The folder will be in path as long as you are in that shell. To overwrite the path you have to assign new path. As oli already mentioned in the other answer.

You can use the following command to set old path

export PATH=`echo ${PATH/\:\/home\/avinash\/Desktop\/raj/}`

Or, simply

export PATH=${PATH/':/home/avinash/Desktop/raj'/}

This is Substring Replacement,

${string/substring/replacement}
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If you want use it as a command, here is a little script:

#!/bin/bash

# This script removes folder from PATH variable
# Folders to remove reading as arguments

if [ $# -lt 1 ]; then
    echo "You should give at least one argument"
    echo "For example"
    echo "$0 /usr/local/bin"
else
    FOLDERS_TO_REMOVE=`echo $@ | sed 's/ /|/g'`

    echo "You actually PATH variable is:"
    echo $PATH
    echo "###"

    PATH=$( echo ${PATH} | tr -s ":" "\n" | grep -vwE "(${FOLDERS_TO_REMOVE})" | tr -s "\n" ":" | sed "s/:$//" )

    echo "Now you need to run"
    echo "export PATH=$PATH"
fi

Name it unexport, and add it to your PATH.

Usage:

unexport /usr/local/bin /bin /sbin

This script does not change your actually PATH. If you want script to do it, you should change last line. Substitute echo "export PATH=$PATH" to export PATH=$PATH

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