Shell Programming Concept
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This document discusses shell scripting parameters and conditional tests. It defines common shell parameters like $1, $2 for individual arguments and $* for all arguments as a string. It also covers comparison operators for conditional tests like -eq for equal, -ne for not equal. An example tests if variable x equals y and prints the return value, then an if statement checks if the number of arguments is not equal to 3 and prints a message.
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Shell Programming Concept
- 7. $1 The first argument $2 Second argument $0 The name of the script $# The number of argument $* The complete set of positional parameters as single string.
- 10. -eq Equal to -ne Not equal to -gt GreaterThan -ge Greater than equal to -lt Less than -le Less than equal to $ x=5; y=7; $ test $x –eq $y; echo $? 1 Not equal if test $# -ne 3; then echo “You didn’t enter three arguments else echo “You entered correctly” fi