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Advanced Bash-Scripting Guide: PrevChapter 8. Operations and Related TopicsNext
8.1. Operators


variable assignment

Initializing or changing the value of a variable


All-purpose assignment operator, which works for both arithmetic and string assignments.

var=27category=minerals # No spaces allowed after the "=".

Do not confuse the "=" assignment operator with the = test operator.

# = as a test operatorif [ "$string1" = "$string2" ]# if [ "X$string1" = "X$string2" ] is safer,# to prevent an error message should one of the variables be empty.# (The prepended "X" characters cancel out.) then commandfi