Bash script to check if pipreqs is installed [closed] - linux

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I'm working on a bash script to detect if pipreqs is installed on a system and install pipreqs if it isn't installed.
this is what I have so far;
if command -v pipreqs > /dev/null; then
echo "pipreqs is already installed"
else
echo "pipreqs is not installed, installing now"
pip install pipreqs
fi
line 1 doesn't seem to work how I intend it.
I'm new to scripting.

Answer 1

Testing the pipreqs command is available within the $PATH environment is not reliable. It can give you false negative, because command -v pipreqs will fail if the pipreqs command is not within one of the paths within the $PATH environment variable.
If pipreqs is installed by a user account locally with pip install --user pipreqs, it will try to place the pipreqs command within the ~/.local/bin directory if it is registered to the $PATH environment variable. But it may not be available to the $PATH and fail command -v pipreqs
If you need to check that the pipreq package is installed, even without a pipreqs command in $PATH, then you could do the check with pip like this:
if pip --quiet show pipreqs 2> /dev/null; then
echo "pipreqs is already installed"
else
echo "pipreqs is not installed, installing now"
pip install --user pipreqs
fi
You could find more info on managing python project dependencies if it is what you are trying to do with pipreqs here: https://packaging.python.org/en/latest/tutorials/managing-dependencies/