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What is the difference between . . and source? [duplicate] When the script is done, any changes that it made to the environment are discarded script The above sources the script It is as if the commands had been typed in directly Any environment changes are kept source script This also sources the script The source command is not required by POSIX and therefore is less portable than the shorter
Source vs . why different behaviour? - Unix Linux Stack Exchange source is a shell keyword that is supposed to be used like this: source file where file contains valid shell commands These shell commands will be executed in the current shell as if typed from the command line
What is the difference between . and source in shells? 2 source is there for readability and self-documentation, exists because it is quick to type The commands are identical Perl has long and short versions of many of its control variables for the same reason
sudo: source: command not found - Unix Linux Stack Exchange 34 source is a shell builtin, so it cannot be executed without the shell However, by default, sudo do not run shell From sudo Process model When sudo runs a command, it calls fork (2), sets up the execution environment as described above, and calls the execve system call in the child process If you want to explicitly execute shell, use -s option:
scp copy direction: what is source, what is target? And most allow multiple sources before the final target if it makes sense to do so That includes scp Some commands (like the GNU versions of cp and mv) have an option (e g -t or --target-directory=DIRECTORY) that allow you to put the target first - but the default is the standard "source (s) before target"