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Linux / UNIX source Command Examples

How do I use source command under UNIX / Linux / BSD / OS X operating systems?

The source command in shell is used to execute commands from a file in the current shell. This is useful to load function or variables stored in another file.

source command syntax

The syntax is as follows:

source filename
source /path/to/file

It will read and execute commands from given FILENAME in the current shell. The entries in $PATH are used to find the directory containing FILENAME.

source command Examples

Create a function file called functions.sh as follows:

  echo "I'm hello()"
  echo "OS is - $(uname)"

Create a shell script called test.sh as follows

source functions.sh
# call hello function
# call getos function

Save and close the file. Run it as follows:
chmod +x test.sh

See also:

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