Bash Shell scripting – If Statement ( If then fi, If then else fi, If elif else fi)




Bash Shell scripting - If Statement

Bash Shell

Conditional Statements
  • Conditionals let us decide whether to perform an action or not, this decision is taken by evaluating an expression. The most basic form is:

 

 

  • the elif (else if) and else sections are optional
  • Put spaces after [ and before ], and around the operators and operands.

Expressions

  • An expression can be: String comparison, Numeric comparison, File operators and Logical operators and it is represented by [expression]:

Number Comparisons:

  • Examples:

String Comparisons:

  • Examples:

Example Script

number.sh

string.sh

 


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