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It seems that I have faced a famous problem that "pipes spawn subshells" since it has been asked several times, but in my case it is a bit different so I couldn't use their solutions for my problem. I'm not piping anything into the read command, rather I'm piping the output of the read command to the "tee" to write to an output file:

pevdelete(){

    ...

    pevdeletebool=false

    while read -r line

        do

            if [[ ! $line =~ "export $1=" ]]

            then

                echo "$line"

            else

                pevdeletebool=true # probably this gets run in a subshell

                envtodelete=$1

            fi

        done <~/.pev | sudo tee -a pevtemp > /dev/null

# this condition never evaluates to true: 

        if [[ $pevdeletebool = true ]]; then echo "unset $envtodelete" | tee pevtemp2; source pevtemp2; fi

    ...

}

The problem is, the condition if [[$pevdeletebool = true ]]; then... never runs.

(JIC you need to know, the reason I'm writing unset $envtodelete into a file(pevtemp2) is I want to unset an environment variable from my script and doing it directly won't work. So instead, I have to "source" another script file(pevtemp2) containing that unset command in order to make it work).

pipe environment-variables subshell

share

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What solutions couldn't you use? Process substitution is commonly suggested, and it should work fine.
  
  – muru
  18 secs ago
  

  
  
  
  

add a comment | 

0

It seems that I have faced a famous problem that "pipes spawn subshells" since it has been asked several times, but in my case it is a bit different so I couldn't use their solutions for my problem. I'm not piping anything into the read command, rather I'm piping the output of the read command to the "tee" to write to an output file:

pevdelete(){

    ...

    pevdeletebool=false

    while read -r line

        do

            if [[ ! $line =~ "export $1=" ]]

            then

                echo "$line"

            else

                pevdeletebool=true # probably this gets run in a subshell

                envtodelete=$1

            fi

        done <~/.pev | sudo tee -a pevtemp > /dev/null

# this condition never evaluates to true: 

        if [[ $pevdeletebool = true ]]; then echo "unset $envtodelete" | tee pevtemp2; source pevtemp2; fi

    ...

}

The problem is, the condition if [[$pevdeletebool = true ]]; then... never runs.

(JIC you need to know, the reason I'm writing unset $envtodelete into a file(pevtemp2) is I want to unset an environment variable from my script and doing it directly won't work. So instead, I have to "source" another script file(pevtemp2) containing that unset command in order to make it work).

pipe environment-variables subshell

share

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What solutions couldn't you use? Process substitution is commonly suggested, and it should work fine.
  
  – muru
  18 secs ago
  

  
  
  
  

add a comment | 

It seems that I have faced a famous problem that "pipes spawn subshells" since it has been asked several times, but in my case it is a bit different so I couldn't use their solutions for my problem. I'm not piping anything into the read command, rather I'm piping the output of the read command to the "tee" to write to an output file:

pevdelete(){

    ...

    pevdeletebool=false

    while read -r line

        do

            if [[ ! $line =~ "export $1=" ]]

            then

                echo "$line"

            else

                pevdeletebool=true # probably this gets run in a subshell

                envtodelete=$1

            fi

        done <~/.pev | sudo tee -a pevtemp > /dev/null

# this condition never evaluates to true: 

        if [[ $pevdeletebool = true ]]; then echo "unset $envtodelete" | tee pevtemp2; source pevtemp2; fi

    ...

}

The problem is, the condition if [[$pevdeletebool = true ]]; then... never runs.

(JIC you need to know, the reason I'm writing unset $envtodelete into a file(pevtemp2) is I want to unset an environment variable from my script and doing it directly won't work. So instead, I have to "source" another script file(pevtemp2) containing that unset command in order to make it work).

pipe environment-variables subshell

share

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

pevdelete(){

    ...

    pevdeletebool=false

    while read -r line

        do

            if [[ ! $line =~ "export $1=" ]]

            then

                echo "$line"

            else

                pevdeletebool=true # probably this gets run in a subshell

                envtodelete=$1

            fi

        done <~/.pev | sudo tee -a pevtemp > /dev/null

# this condition never evaluates to true: 

        if [[ $pevdeletebool = true ]]; then echo "unset $envtodelete" | tee pevtemp2; source pevtemp2; fi

    ...

}

share

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

share

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

asked 5 mins ago

aderchoxaderchox

1577 bronze badges

asked 5 mins ago

aderchoxaderchox

1577 bronze badges