Bash Centos7 "which" command

Instead of which command you can use type command.

type grep > /dev/null 2> /dev/null
if test "$?" != "0"
then
    echo "\"grep\" command not found."
    echo "Installation is aborted."
    exit 1
fi

To find a package in CentOS, use yum whatprovides:

yum whatprovides *bin/which

In this particular case, the package is called which, so

yum install which

should pull it in.

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