what is source, . (dot command):??

[sandhya rani]

Pls Help me to know abt........the following commands.
1) what is source, .(dot command) in unix shell scripting n where we use this command n its functionalities ??
2)wht is exec: in unix shell programming??Wh t is its significance??

[arne]

Pls Help me to know abt........the following commands.
1) what is source, .(dot command) in unix shell scripting n where we use this command n its functionalities ??
2)wht is exec: in unix shell programming??Wh t is its significance??

Did you try to understand "man source" and "man exec"?