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Joachim Ansorg edited this page Nov 12, 2021 · 2 revisions

(( )) doesn't support decimals. Use bc or awk.

Bash arithmetic conditional evaluation can only be performed on integers. More detail: Bash has limited data types which include integer, but everything is effectively untyped.

Suggested workarounds to this constraint use bc or awk, here are some examples.

cmd <<< $var # Requires quoting on Bash 3 (but not 4+) : ${var=default} # Should be quoted to avoid DoS when var='/////'debug="" $1 == "--trace-commands" && debug="yes" bash ${debug:+"-x"} scriptdebug="" $1 == "--trace-commands" && debug="-x" bash $debug scriptmake_with_flags() { [ "$debug" = "yes" ] && set -- -d "$@" make -j 5 -B "$@" } make_with_flags fileoptions=(-j 5 -B) # ksh88: set -A options -- -j 5 -B $debug == "yes" && options=("${options[@]}" -d) make "${options[@]}" fil

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