Dec 202012
 Posted by on December 20, 2012 at 8:07 pm bash, FAQ, Shell Scripting  Add comments

The results of parameter and arithmetic expansions, as well as command substitution, are subjected to word splitting if they were not quoted:

$ var="this is a multiword value"

$ sa $var "$var"






:this is a multi-word value:

Word splitting is based on the value of the internal field separator variable, IFS. The default value of IFS contains the whitespace characters of space, tab, and newline (IFS=$’ \t\n’). When IFS has its default value or is unset, any sequence of default IFS characters is read as a single delimiter.

$ var='         spaced out     '

$ sa $var


: out:

If IFS contains another character (or characters) as well as whitespace, then any sequence of whitespace characters plus that character will delimit a field, but every instance of a nonwhitespace character delimits a field:

S IFS=' :'

$ var="qwerty : uiop : :: er " ## : :: delimits 2 empty fields

$ sa $var






If IFS contains only nonwhitespace characters, then every occurrence of every character in IFS delimits a field, and whitespace is preserved:

$ IFS=:

$ var="qwerty : uiop : :: er "

$ sa $var

:qwerty :

: uiop :

: :


: er :
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