Bash += and -=

From NovaOrdis Knowledge Base
Revision as of 05:39, 8 May 2020 by Ovidiu (talk | contribs) (→‎Overview)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

External

Internal

Overview

+= and -= are assignment operators that can be used to increment/decrement the value of the left operand with the value specified after the operator. The operators can be used on integral values as such:

i=0
((i+=1))
echo ${i}

displays:

1

Also:

i=0
((i-=1))
echo ${i}

displays:

-1

+= can be used on string values as such:

s="something"
s+=" else"
echo ${s}

displays:

something else

-= does not work with strings.