The meaning of export command in Ubuntu [closed]

Answer 1

export is a command in the Bash shell language. When used to set a variable, as in your example, the variable (PATH) will be visible ("exported to") any subprocesses started from that instance of Bash. Without the export command, the variable will not exist in the subprocess.

Answer 2

It sets the environment variable PATH to the value of whatever PATH currently is plus the new path appended to it.

Answer 3

This means, that your path is extended with /usr/src/hive/build/dist/bin/. Normally /usr/bin, /bin, /usr/sbin, etc are "in your path". If you have a programm /bin/sh, you can just type sh to run it. If you have a program in /usr/src/hive/build/dist/bin/appname you can just run appname to execute it.