Ubuntu – Run sudo command within directory

bashcd-commandsudo

Possible solutions could be:

Starting interactive session.
```
sudo -s <<< "cd dir ; command"
```
or
```
sudo /bin/bash -c "cd dir ; command"
```
But I don't have /bin/bash /bin/sh /bin/su or other sudoer permissions
Changing directory before sudo is done.
```
cd dir ; sudo command
```
But I don't have permission to enter the dir.
I need a general case pwd set (like Popen cwd), so below is not answer I can use:
```
sudo command /path/to/file
```

What I'm trying to write is python Popen wrapper with sudo=True/False option, and currently I'm trying to somehow get cwd parameter to work.

Best Answer

I'm not sure what the bigger picture is, but your approach should be to run the command with on a file in the directory. E.g. if you want to run grep regex file where file is in /root, then you should approach it like this:

$ sudo grep regex /root/file

And not:

$ sudo 'cd /root; grep regex file'
sudo: cd /root; grep regex file: command not found

Why this output? Well, it's shell syntax and sudo isn't running the command in another interactive shell.

Another approach would be to alter the environment variable PWD, like this:

$ sudo -i PWD=/root grep regex file

Related Solutions

Ubuntu – How to run a script when the power supply is plugged-in or -out

You can use on_ac_power to run a script when the power supply is turned on or off.

Try the following in a terminal.

$ on_ac_power
$ echo $?
0              ## Laptop on ac power

$ on_ac_power
$ echo $?
1              ## Laptop on battery (not on ac power)

Based on this you can make your script as,

#!/bin/bash
while true
do
    if on_ac_power; then 
        do_something               ## Laptop on power
    else
        do_something_else          ## Laptop on battery
    fi
    sleep 10                       ## wait 10 sec before repeating
done

EDIT:

cron job would be a better idea for running the script at a regular interval instead of using an infinite loop.

Save your script as myscript.sh and put the following content in it,

#!/bin/bash
if on_ac_power; then 
    do_something
else
    do_something_else
fi

Make the script executable from a terminal, chmod +x /path/to/myscript.sh. Open your personal crontab as EDITOR=gedit crontab -e and append the following line in it to run your script every minute.

* * * * * /path/to/myscript.sh

Best Answer

Related Solutions

Ubuntu – How to run a script when the power supply is plugged-in or -out

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