Korn Shell: Unix and Linux Programming Manual, Third Edition, The By Anatole Olczak
Table of Contents
Appendix G. Pdksh Quick Reference
Like in other high-level progamming languages, variables are used by the Korn shell to store values. Variable names can begin with an alphabetic or underscore character, followed by one or more alphanumeric or underscore characters. Other variable names that contain only digits or special characters are reserved for special variables (called parameters) set directly by the Korn shell. Data types (called attributes) and one-dimensional arrays are also supported by the Korn shell.
Variable/Attribute Assignment Format
variable=
declare variable and set it to null
typesetvariable=
declare variable and set it to null. If used within a function, then a local variable is declared.
variable=value
assign value to variable
typesetvariable=value
assign value to variable. If used within a function, then a local variable is declared.
typeset ?/span>attribute variable=value
assign attribute and value to variable
typeset ?/span>attribute variable
assign attribute to variable
typeset +attribute variable
remove attribute from variable (except readonly)
Variable/Attribute Listing Format
typeset ?/span>attribute
display a list of variable names and their values that have attribute set
typeset +attribute
display a list of variable names that have attribute set
