Many says for security reasons the current directory is not in the $PATH variable and Linux does not look in the current directory to see whether a specific command is available from that directory. but I did cd /usr/bin then do ls and it worked just fine; also I did echo $PATH and the output contains /usr/bin.
You should notice that for security reasons the current directory is not in the
$PATHvariable and Linux does not look in the current directory to see whether a specific command is available from that directory.Red Hat® RHCSATM/RHCE® 7 Cert Guide by Sander van Vugt
Why am I able to run ls while being in /usr/bin?
linux does not look in the current directory to see whether a specific command is available from that directory
That's true, but it does look in all directories mentioned in $PATH, even though you might be in such a directory at that moment.
To word it in another way, if . is not in your $PATH, it doesn't matter where you are, it will always search the same directories to see whether a specific command is available there.
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