Solution to the problem that the command cannot be found under Linux

Sometimes when we execute a command on the Linux command line, a command not found error will be reported. The reason for this error is that when executing the command, the system will Search for it in the environment variables. If it is found, execute it. If it is not found, it will report that the command is not found.

Let’s take the example of command not found reported when executing mysql or mysqladmin under Linux to explain the solution.

Check the current environment variables of the system

After the mysql program is installed, when directly executing mysql or mysqladmin, the system will first go to /usr/bin Search for the command. If it is not in this directory, of course it will not be found. At this time, we need to create a link file for these unfound commands and link to /usr/bin.

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First we check whether this command exists in the environment variable. The operation is as follows:

[root@admin bin]# which mysqladmin

or

[root@admin bin]# where is mysqladmin

If the command exists in the environment variable, the specific path will be output, as shown below:

If it does not exist, it will prompt The command was not found, as shown below:

Before linking, we must know the full path of this command, such as mysqladmin
Look for the full path of this command

[root@admin bin]# find / -name mysqladmin

The results can be seen that there are two places where mysqladmin exists. We don’t need to worry about the first one, that is his original path. The next thing you need to do is to link the following path directly to /usr/bin. The operation is as follows:

[root@admin bin]# ln -s /usr/local/mysql/bin/mysqladmin /usr/bin

After the link is successful, execute this command again and it will be ok.

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